Sound Pressure inside the cabin

[jahlin]

Hello,
I am trying to measure the sound pressure inside a cabin. I placed 2 microphones to measure it using octave band. For each frequency i have two sound pressures ..is it possible to take the average of them ? for example add the 2 sound pressure for the 2 microphones and divide them by 2?
Thanks.

 

[edgepflow]

You have to do a logorithmic weighted average. See "Noise Control" by Colin Hansen for details. But I think a simple approach is:

Lavg = 10 log [ 10^(L1/10) + 10^(L2/10) + ... + 10^(LN/10) ]

Where L1, L2, ... LN are your readings at each frequency.