好东西,确实有很多朋友和同行想知道!

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建议Admin将其转换成PDF放在资料室便于查看，谢谢

感谢无私奉献!

其他GB在资料室有一部分.

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The AES2-1984 standard

This is a standard for loudspeaker components by the Audio Engineering Society. It is very commonly used, and, although meant for components, it is also often used for individual ways of an active system. It specifies a 6 dB crest factor pink noise signal, with a bandwidth of one decade. For example, a bass loudspeaker could use a 60-600 Hz band, whereas a high frequency unit could use 1500-15000 Hz. The illustration shows the spectrum of both AES signal spectrum examples. The duration of the test is 2 hours, after which the component should not show appreciable damage.

The IEC268-1 (1985) standard

This is a standard by the International Electrotechnical Commission. It specifies a 6 dB crest factor pink noise signal over which an IEC programme filtering has been applied. This programme spectrum tries to approximate the frequency content of real music, and shows reduced lows and highs. The illustration compares this spectrum to the AES ones.

Test duration is 100 hours, after which the speaker should not show appreciable damage.

he EIA RS-426-A (1980) standard

This is a standard by the (USA) Electronic Industries Association. The duration of the test is 8 hours, after which the speaker should not show appreciable damage. The signal is also 6 dB crest factor pink noise signal, but with programme filtering that is different to the IEC standard and is also shown on the previous illustration.