this question is bit of subjective! i have a room of 10x12 feet approx. how much min. volume displacement would be needed for acceptable low bass of 20hz at 90db SPL. is there any calculator for this?
The SPL is simply the ratio between the volume displacement of the speaker and the volume of the room. If you have Excel, I have attached a small spreadsheet. It'll help you determine if your intended speaker will get near the figure you want. This assumes a sealed room with rigid walls, and real rooms are anything but. It also assumes that the frequency of interest is below the lowest room resonance.
hi Don, thanks for the simple tool. according to this, with just two 12" sub having Xmax of 6mm, SPL can reach to 100dB. but at what frequency?
At all frequencies(*). SPL due to "room pressurisation" is frequency independent.
(*) "All frequencies" is theoretically correct but in practice only makes sense below the lowest room resonant frequency. I suggest the following thread for further reading:
http://www.diyaudio.com/forums/subwoofers/62267-modeling-room-gain.html
(*) "All frequencies" is theoretically correct but in practice only makes sense below the lowest room resonant frequency. I suggest the following thread for further reading:
http://www.diyaudio.com/forums/subwoofers/62267-modeling-room-gain.html
Don,
I downloaded and saved the post2 xls.
For a room of 131cub m, it predicts that I cannot get 100dB of SPL at any frequency from 4 off 18" speakers when I limit Xmax to 4mm and Sd=1100
Is that right?
Are your units correct?
18" has Sd=1300mm²
That should be 1300cm²
I downloaded and saved the post2 xls.
For a room of 131cub m, it predicts that I cannot get 100dB of SPL at any frequency from 4 off 18" speakers when I limit Xmax to 4mm and Sd=1100
Is that right?
Are your units correct?
18" has Sd=1300mm²
That should be 1300cm²
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