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Who has experience on audio testing?

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lcg22

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What's the meaning of the following specs? Thanks a lot. :)

What does "M+S: 30%" mean?

Residual modulation (what's this?)
FM component:
(AF 1 kHz, FM 75 kHz)
³ 90 dB (10.7 ± 1/76 to 108 MHz)
³ 80 dB (0.3 to 280 MHz)
(BW 50 Hz to 15 kHz)
(De-emphasis 50 µs)

AM component:
(AF 1 kHz, AM 30 %)
³ 65 dB (0.4 to 1.7 MHz)
³ 60 dB (0.15 to 280 MHz)
(BW 50 Hz to 15 kHz)
(Except beat element)
 

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