This material may consist of step-by-step explanations on how to solve a problem or examples of proper writing, including the use of citations, references, bibliographies, and formatting. This material is made available for the sole purpose of studying and learning - misuse is strictly forbidden.
The microphone is 7' far from the source. The source produces pressure of 100dbSPL at 4'. So until 7' there will be a reduction of
20log(7/4) = 20log1.75 = 4.86dB
So the sound pressure level at mic will be
100 – 4.86 = 95.14dB SPL.
We know that 94db SPL corresponds to 1Pa of pressure, and on this mic 1Pa yields -46dbV. The sound pressure level at mic is 95.14dB SPL, which is
95.14 – 94 = 1.14dB SPL
more. This means that there will be 1.14dBV more on the mics output also.
-46 + 1.14 = -44.86dBV
Between the mic and mic preamp there is a 10dB loss on mic pad, so the input to the preamp will be
-44.86 – 10 = -54.86dBV...
This is only a preview of the solution. Please use the purchase button to see the entire solution