Relating mic sensitivity to output voltage
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 28th February 2008, 11:18 PM #1 veracohr   diyAudio Member   Join Date: Dec 2006 Relating mic sensitivity to output voltage I wanted to get an idea of the range of output voltages from microphones, so I did some searching, but I'm having trouble relating mic sensitivity figures to voltage. Can someone tell me what I'm missing in this calculation? As a random reference, I looked at the specs for a Neumann U87ai, from their website. -Using cardioid pattern, sensitivity is 28mV/Pa -Max SPL is 117dB -Max Vout is 390mV Here was my logical thought process, which obviously is flawed somehow: 1 Pa is the pressure produced by 94 dBSPL 117dB = 94*1.244, so 117dBSPL should produce 1.244 Pa of pressure With a sensitivity of 28mV/Pa, 28*1.244 = 34.8mV at 117dB But they state the max output is 390mV. So where did I go wrong? If I find a microphone spec that doesn't list max output voltage, how do I correctly convert the sensitivity to a maximum output based on the maximum SPL?
 28th February 2008, 11:25 PM #2 xiphmont   diyAudio Member     Join Date: Apr 2007 decibels are logarithmic. 20dB is a factor of ten. 40dB is a factor of 100, etc. .390v / .028v is a factor of 13.93. a factor of 13.93 is a shade under 23dB 117dB - 94dB = 23dB It all matches up. __________________ "My name's Monty, and I break things." "Hello, Monty!"
 29th February 2008, 05:24 PM #3 veracohr   diyAudio Member   Join Date: Dec 2006 Thanks

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