GB/T 14474-2024 English PDF

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GB/T 14474-2024: Horn loudspeakers - General requirements
Status: Valid

GB/T 14474: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 14474-2024	429	Add to Cart	4 days	Horn loudspeakers - General requirements	Valid
GB/T 14474-1993	389	Add to Cart	3 days	General specification for horn loudspeakers

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Basic data

Standard ID: GB/T 14474-2024 (GB/T14474-2024)
Description (Translated English): Horn loudspeakers - General requirements
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: M72
Classification of International Standard: 33.160.99
Word Count Estimation: 21,223
Date of Issue: 2024-10-26
Date of Implementation: 2025-05-01
Older Standard (superseded by this standard): GB/T 14474-1993
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 14474-2024: Horn loudspeakers - General requirements

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14474-2024
ICS 33.160.99 CCSM72 National Standard of the People's Republic of China Replaces GB/T 14474-1993 General requirements for horn loudspeakers Released on October 26, 2024 Implementation on May 1, 2025 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Requirements 1 4.1 Passive horn loudspeaker (without matching transformer) 1 4.2 Passive horn loudspeaker (with matching transformer) 3 4.3 Active Horn Loudspeaker 4 4.4 Others 5 4.5 Environmental adaptability 6 5 Inspection Rules 6 5.1 Inspection categories 6 5.2 Identification and Inspection 6 5.3 Batch inspection 8 5.4 Periodic Inspection 11 6 Marking, packaging, transportation and storage 13 6.1 Sign 13 6.2 Packaging 14 6.3 Transportation 14 6.4 Storage 14 Appendix A (Informative) Basic Classification of Horn Loudspeakers 15 A.1 Overview 15 A.2 Horn shape classification 15 A.3 Drive unit classification 15 A.4 Horn Loudspeaker Classification 16 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 14474-1993 "General Technical Requirements for Horn Loudspeakers". Compared with GB/T 14474-1993, except for the structure In addition to adjustments and editorial changes, the main technical changes are as follows. a) The scope of application of the document has been changed to include civil public address terminal electric horn loudspeakers (see Chapter 1,.1993 edition). Chapter 1); b) Added "Basic Classification of Horn Loudspeakers" (see 4.1.1); c) The requirements for “characteristic sensitivity level” have been changed (see 4.1.3.6, 5.3.3 of the.1993 edition); d) Added “Power compression value at specified frequency point” (see 4.1.3.7), “Directivity index” (see 4.1.3.9), “Coverage angle” (see 4.1.3.10) technical requirements; e) Added the requirements for “passive horn loudspeaker (with matching transformer)” products (see 4.2); f) Added requirements for “active horn loudspeaker” products (see 4.3); g) Added the requirements for “stray magnetic field” (see 4.4.4); h) The requirements for “low temperature loads and storage” have been modified (see 4.5, 5.5.5 of the.1993 edition); i) The requirements for the "dust and water resistance" test have been changed (see 4.5, 5.5.6 of the.1993 edition); j) Added the requirements for the "salt spray" test (see 4.5); k) Added the requirements for the "solar radiation" test (see 4.5); l) The product inspection item list and sampling parameters in Chapter 5 “Inspection Rules” have been modified (see Chapter 5, Chapter 6 of the.1993 edition). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This document is under the jurisdiction of the National Technical Committee for Standardization of Audio, Video and Multimedia Systems and Equipment (SAC/TC242). This document was drafted by. Jiangsu Electronic Information Product Quality Supervision and Inspection Institute, Wuxi Jeff Electroacoustic Co., Ltd., Nanjing University of Science and Technology Shenzhen Research Institute, Taixing Yangsheng Electronics Co., Ltd., China Electronics Technology Standardization Institute, and Hangzhou Cheling Network Technology Co., Ltd. The main drafters of this document are. Zhang Zhiqiang, Chen Jiasheng, Shen Dongbo, Shen Yong, Zhang Tengbiao, Yin Xiaogen, Cai Lujun, and Bao Sen. The previous versions of this document and the documents it replaces are as follows. ---First published in.1993 as GB/T 14474-1993. ---This is the first revision. General requirements for horn loudspeakers 1 Scope This document specifies the product requirements, inspection rules, marking, packaging, transportation and storage of civil public broadcasting terminal horn loudspeakers. Require. This document applies to the design, manufacture and inspection of electric horn loudspeakers for civil public broadcasting terminals. It is used for reference by horn loudspeakers based on transducers and other transducer principles. 2 Normative references The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 191 Pictorial markings for packaging, storage and transportation GB/T 2828.1 Sampling procedures for inspection by attributes Part 1.Sampling plans for batch inspection based on acceptance quality limit (AQL) GB/T 2829 Periodic Inspection Attribute Sampling Procedures and Tables (Applicable to Inspection of Process Stability) GB 4943.1 Audio, video, information technology and communication technology equipment Part 1.Safety requirements GB/T 9254.1 Information technology equipment, multimedia equipment and receivers - Electromagnetic compatibility - Part 1.Emission requirements GB/T 14475-2024 Horn loudspeaker measurement methods GB 17625.1 Electromagnetic compatibility limits Part 1.Limits of harmonic current emissions (equipment input current per phase ≤ 16A) 3 Terms and Definitions The terms and definitions defined in GB/T 14475-2024 apply to this document. 4 Requirements 4.1 Passive horn loudspeaker (without matching transformer) 4.1.1 Dimensions, appearance and mechanical quality The horn loudspeaker consists of a drive unit and a horn as a sound load. The classification of the horn, drive unit and the horn loudspeaker they consist of is shown in Appendix A. Its overall dimensions and installation dimensions shall comply with the manufacturer's product specifications, the structure and appearance shall be complete, the markings shall be clear, and the appearance shall be It should be neat and tidy; there should be no obvious mechanical damage; the rivets, welding, fastening and gluing should be firm and reliable; the paint layer should not be wrinkled, scratched or peeling. The coating of parts shall comply with the provisions of the product technical documents. 4.1.2 Listening test 4.1.2.1 Listening test for normal operation The sound level, timbre, noise, etc. of the horn loudspeaker should not have any defects and should operate normally. ......

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