GET https://dev.normadoc.fr/products/ieee-219-1975-ieee00006339-243232

Response
200 OK
IP
216.73.216.116
Profiled on
Token
7349ca

Components

3 Twig Components
9 Render Count
4 ms Render Time
172.0 MiB Memory Usage

Components

Name Metadata Render Count Render Time
ProductState 
"App\Twig\Components\ProductState"
components/ProductState.html.twig 		4 0.88ms
ProductMostRecent 
"App\Twig\Components\ProductMostRecent"
components/ProductMostRecent.html.twig 		4 2.84ms
ProductType 
"App\Twig\Components\ProductType"
components/ProductType.html.twig 		1 0.21ms

Render calls

ProductState App\Twig\Components\ProductState 172.0 MiB 0.30 ms
Input props 
[
  "product" => App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  "showFullLabel" => "true"
]
Attributes 
[
  "showFullLabel" => "true"
]
Component 
App\Twig\Components\ProductState {#93007
  +product: App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  +appearance: "state-withdrawn"
  +labels: [
    "Withdrawn"
  ]
  -stateAttributeCode: "state"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductType App\Twig\Components\ProductType 172.0 MiB 0.21 ms
Input props 
[
  "product" => App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
]
Attributes 
[]
Component 
App\Twig\Components\ProductType {#93187
  +product: App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  +label: "Standard"
  -typeAttributeCode: "type"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductMostRecent App\Twig\Components\ProductMostRecent 172.0 MiB 0.72 ms
Input props 
[
  "product" => App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
]
Attributes 
[]
Component 
App\Twig\Components\ProductMostRecent {#93262
  +product: App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  +label: "Most Recent"
  +icon: "check-xs"
  -mostRecentAttributeCode: "most_recent"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductState App\Twig\Components\ProductState 172.0 MiB 0.21 ms
Input props 
[
  "product" => App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
  "showFullLabel" => "true"
]
Attributes 
[
  "showFullLabel" => "true"
]
Component 
App\Twig\Components\ProductState {#100306
  +product: App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
  +appearance: "state-suspended"
  +labels: [
    "Superseded"
  ]
  -stateAttributeCode: "state"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductMostRecent App\Twig\Components\ProductMostRecent 172.0 MiB 0.77 ms
Input props 
[
  "product" => App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
]
Attributes 
[]
Component 
App\Twig\Components\ProductMostRecent {#100373
  +product: App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
  +label: "Historical"
  +icon: "historical"
  -mostRecentAttributeCode: "most_recent"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductState App\Twig\Components\ProductState 172.0 MiB 0.19 ms
Input props 
[
  "product" => App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  "showFullLabel" => "true"
]
Attributes 
[
  "showFullLabel" => "true"
]
Component 
App\Twig\Components\ProductState {#106954
  +product: App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  +appearance: "state-withdrawn"
  +labels: [
    "Withdrawn"
  ]
  -stateAttributeCode: "state"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductMostRecent App\Twig\Components\ProductMostRecent 172.0 MiB 0.75 ms
Input props 
[
  "product" => App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
]
Attributes 
[]
Component 
App\Twig\Components\ProductMostRecent {#106996
  +product: App\Entity\Product\Product {#7310
    #id: 11580
    #code: "IEEE00006339"
    #attributes: Doctrine\ORM\PersistentCollection {#7700 …}
    #variants: Doctrine\ORM\PersistentCollection {#7743 …}
    #options: Doctrine\ORM\PersistentCollection {#7915 …}
    #associations: Doctrine\ORM\PersistentCollection {#7899 …}
    #createdAt: DateTime @1751039809 {#7274
      date: 2025-06-27 17:56:49.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1753970307 {#7322
      date: 2025-07-31 15:58:27.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#7921 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#7920
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#7310}
        #id: 41329
        #name: "IEEE 219:1975"
        #slug: "ieee-219-1975-ieee00006339-243232"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These recommendations apply to loudspeakers and loudspeaker systems.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice for Loudspeaker Measurements"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#7533 …}
    #channels: Doctrine\ORM\PersistentCollection {#7627 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#7612 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#7644 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#7389 …}
    -apiLastModifiedAt: DateTime @1743289200 {#7317
      date: 2025-03-30 00:00:00.0 Europe/Paris (+01:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#7292
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @186015600 {#7318
      date: 1975-11-24 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 22
    -documents: Doctrine\ORM\PersistentCollection {#7464 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7499 …}
  }
  +label: "Most Recent"
  +icon: "check-xs"
  -mostRecentAttributeCode: "most_recent"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductState App\Twig\Components\ProductState 172.0 MiB 0.17 ms
Input props 
[
  "product" => App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
  "showFullLabel" => "true"
]
Attributes 
[
  "showFullLabel" => "true"
]
Component 
App\Twig\Components\ProductState {#107061
  +product: App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
  +appearance: "state-suspended"
  +labels: [
    "Superseded"
  ]
  -stateAttributeCode: "state"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}
ProductMostRecent App\Twig\Components\ProductMostRecent 172.0 MiB 0.61 ms
Input props 
[
  "product" => App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
]
Attributes 
[]
Component 
App\Twig\Components\ProductMostRecent {#107088
  +product: App\Entity\Product\Product {#100252
    #id: 11579
    #code: "IEEE00006338"
    #attributes: Doctrine\ORM\PersistentCollection {#100235 …}
    #variants: Doctrine\ORM\PersistentCollection {#100232 …}
    #options: Doctrine\ORM\PersistentCollection {#100228 …}
    #associations: Doctrine\ORM\PersistentCollection {#100230 …}
    #createdAt: DateTime @1751039808 {#100260
      date: 2025-06-27 17:56:48.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#100233
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#100246 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#100270
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#100252}
        #id: 41325
        #name: "IEEE 219:1961"
        #slug: "ieee-219-1961-ieee00006338-243231"
        #description: """
           - Superseded.<br />\n
          <br />\n
          \t\t\t\t<br />\n
          These Recommended Practices define terms associated with loudspeakers and their testing, recommend various methods of testing, and indicate preferred methods of presenting information regarding their characteristics. Specific information is presented in Sections 2-7. Discussions of a more qualitative nature are given in Sections 8 and 9. In these Practices, the tests recommended involve physical, steady-state measurements only. Work has been and is now being done on transient measurements of loudspeaker performance, but experience with these methods is still not sufficiently widespread to warrant their inclusion. While the physical data which can be obtained as detailed in Sections 4-9, inclusive, are a helpful guide in designing and in selecting a loudspeaker for a certain purpose, they are not a complete guarantee that the subjective performance will be satisfactory. Wherever it is possible, the quality of reproduction should be checked by means of listening tests such as those described in the literature.1
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Recommended Practice on Audio and Electro Acoustics Loudspeaker Measurements 1961"
        -notes: "Superseded"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#100243 …}
    #channels: Doctrine\ORM\PersistentCollection {#100237 …}
    #mainTaxon: Proxies\__CG__\App\Entity\Taxonomy\Taxon {#7311 …}
    #reviews: Doctrine\ORM\PersistentCollection {#100241 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#100239 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#7325 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#100253 …}
    -apiLastModifiedAt: DateTime @1754517600 {#100220
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#100259
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @-284000400 {#100258
      date: 1961-01-01 00:00:00.0 Europe/Paris (+01:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: null
    -edition: null
    -coreDocument: "219"
    -bookCollection: ""
    -pageCount: 10
    -documents: Doctrine\ORM\PersistentCollection {#100250 …}
    -favorites: Doctrine\ORM\PersistentCollection {#100248 …}
  }
  +label: "Historical"
  +icon: "historical"
  -mostRecentAttributeCode: "most_recent"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}