GB/T 14475-2024 in English
VALIDHorn loudspeakers—Measuring methods
- Issued on:2024-10-26
- Implemented on:2025-05-01
- File Format:PDF
- Delivery:Via email within 8 business days
Price(USD)：
$730.00
$709.00
$709.00
| Standard No: | GB/T 14475-2024 |
| Document status: | VALID |
| Title in English: | Horn loudspeakers—Measuring methods |
| Title in Chinese: | 号筒扬声器 测量方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 8 business days |
| Issued on: | 2024-10-26 |
| Implemented on: | 2025-05-01 |
| Superseding: |
GB/T 14475-1993 of measurement for horn loudspeakers
|
| ICS Classification: | 33.160.99-Other audio, video and audiovisual equipment |
| Chinese Classification: | M72-Sound and electronic sound equipment |
| Professional Classification: | GB-National Standard |
| Related Keywords: | new solar radiation test
testspecial test requirement test compression driver test shows salt spray test |
| Related Topics: | speaker
Standard Graduated Cylinders and Graduated Cylinders GB/T 14475-1993 |
《GB/T 14475-2024号筒扬声器 测量方法》由TC242（全国音频、视频及多媒体系统与设备标准化技术委员会）归口，主管部门为工业和信息化部（电子）。
Introduction
Core changes in the standard revision
| 1993 version | New content in the 2024 version | Technical significance |
|---|---|---|
| 7 chapters on basic tests | 17 chapters on complete system | Test dimension expanded by 300% |
| Passive speaker test | Special test for active speakers | Adapt to built-in amplifier products |
| General harmonic distortion | Characteristic modulation distortion detection | More accurate nonlinear analysis |
Key measurement parameter system
1. Acoustic performance indicators
- Free field sound pressure level: 94dB standard at 1m reference distance
- Power compression value: reveals the sound energy loss under high power
- Coverage angle: 6dB attenuation boundary measurement method
2. Electroacoustic conversion characteristics
| Parameters | Passive speaker | Active speaker |
|---|---|---|
| Input impedance | Rated impedance 80% lower limit | ≥10kΩ requirement |
| Test voltage | Rated sinusoidal voltage | Characteristic source electromotive force |
Analysis of implementation points
Environmental control requirements
The test needs to be carried out in the range of temperature 15-35℃ and humidity 25-75%, and the free field conditions must meet the following conditions:
- Anechoic chamber 1/r sound pressure attenuation error ≤±10%
- Diffusion field volume ≥200m³ (below 125Hz)
Typical test case
JBL 2446H compression driver test shows:
- Power compression value at 4kHz frequency reaches 2.3dB
- Coverage angle 90°×40° (H×V)
- Sensitivity change after salt spray test <0.5dB
Comparative analysis of the new and old standards
Main technical evolutions of the 2024 version:
- Added matching transformer impedance test method
- Introduced digital signal processing technology to measure transfer function
- Environmental adaptability tests expanded to 11 items (new solar radiation test)
Improved measurement accuracy: total error tightened from ±3dB to ±2dB
Sample only — not a preview of GB/T 14475-2024
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 4959-2011 in English
Methods of measurement for the characteristics of sound reinforcement in auditoria
2011-10-31 -
GB/T 14474-2024 in English
Horn loudspeakers—General requirements
2024-10-26 -
GB/T 28047-2011 in English
Method of listening evaluation of sound reinforcement of auditorium gymnasium and stadium
2011-10-31
