Much analog audio gear has two level-related issues to consider. Digital of course has a hard limit on signal level, and you’ll find many a meter has 0dB as its maximum reading. VU meters were developed in 1939 to be the lingua franca of audio, and not only do they assign 0 dBVU as a meaningful reference point (though not a peak level), but even the meter ballistics are precisely defined (something an electronic VU meter must explicitly emulate if it is to match a d’Arsonval (moving-coil) meter). We’ve all seen “VU” (volume unit) meters on audio equipment, but the truth is, very few of them are true VU meters.
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