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I was wondering if there would be a way to calculate spl of two or three different sound sources. What I'm calculating is spl from small bandpass boxes. I have to use bandpass because I need to vent the sound into the cabin of the car. I'm going to be using two or maybe three 4th order boxes to try to increase bandwith. I'm using small speakers so this shouldn't be to big.

I can calculate what the spl of each individual box will be within a few db.
 

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I was wondering if there would be a way to calculate spl of two or three different sound sources. What I'm calculating is spl from small bandpass boxes. I have to use bandpass because I need to vent the sound into the cabin of the car. I'm going to be using two or maybe three 4th order boxes to try to increase bandwith. I'm using small speakers so this shouldn't be to big.

I can calculate what the spl of each individual box will be within a few db.
Sure!

Adding acoustic levels sum sound levels 10 - combining addition summation decibel levels or SPL of up to ten non-coherent sound sources identical summing 1/3 octave spl full octave sum sound pressure level noise sound pressure acoustic pressure volts
 
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