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Author Topic: Increase in SPL and doubling of speakers.  (Read 2023 times)

Jan Nilsen

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Increase in SPL and doubling of speakers.
« on: April 03, 2008, 07:41:45 pm »

I have seen some claims that doubling the cone area of speakers, like using 2 x 15" in stead of one, gives you an increase in  SPL
on 3 db (same total watt).
This must be frequency dependent since this  is not the case on HF horns etc.? Also in some cases i have heard claims that  
two woofers next to each other can push additional air (the air between them) more than +3 db should be possible ?
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Ivan Beaver

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Re: Increase in SPL and doubling of speakers.
« Reply #1 on: April 03, 2008, 08:03:26 pm »

Yes the general rule only happens at low freq.

In theory you will get 3db for doubling the cabinets, with the same total wattage (1/2 into each) and another 3db when you double the power.

So the maximum is 6db.

At higher freq you will get some addition AND some cancellation, all based on wavelength and driver spacing.  This is know as comb filtering when the drivers cover the same area.  If they are not covering the same area, then there will be no cancellation OR addition.
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For every complicated question-there is a simple- easy to understand WRONG answer.

Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.
Danley Sound Labs

Art Welter

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Re: Increase in SPL and doubling of speakers.
« Reply #2 on: April 04, 2008, 12:49:42 am »

Jan,
Ivan gave you a good, succinct answer.
If you want more info, check out the thread started February 19, 2008:
“Cones x2, +3dB, x2+3dB, how long can this go on?” on the Lab Subwoofer forum.

Art Welter
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