When performing any tests on an audio system, An AC millivoltmeter - calibrated in dB - with a range of 30V down to 3mV full scale (80dB range) would be extremely useful. Attach a microphone (electret mic capsules are quite good), and you have a relative sound level meter, even better if you have some way of calibration.
Authored by
at
, Added: 28 Jul 2007
http://sound.westhost.com/project16.htm
