Re: ambient noise in sound room
April 29th, 2021, 7:01 pm
tomp wrote:Just for grins I set up my ACO Pacific mic in my new audio room and measured the background noise. If my calculations are correct it is 29.5 dB. My mic has a sensitivity of 16.8mV/Pa and I had to set the preamp for a gain of 20 dB to register around 1 MV on my AC voltmeter. That is a voltage gain of 10. It bounced around so it is not a precise measurement. This is broad band measurements since I used no filters. The math says that if 16.8mv is 1 Pa which is 94 dB, then 100 microvolts is about 64.5 dB down so 94 minus 64.5 equals 29.5. Can anyone tell me if I am smoking green stuff in my assessment?
I always suspected, but was not sure until now.
