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Old 26th June 2009, 04:10 PM   #1
diyAudio Member
Join Date: Jan 2004
Default SPL values combined vs dissimilar

Hi there,

Just wanted to ask a question in connection with setting up subwoofers : either gain matching or level matching.

It's been said that if you gain match two subwoofers, the SPL values will differ if both subwoofers are placed in different locations.

So obviously the SPL generated per sub will be dissimilar.

The other approach is to level match. Calibrating each sub to equal SPL levels. Now if both subwoofers were to generate equal SPL levels, you will achieve a 6 dB output advantage (especially if in phase).

Now what I would like to know from some here is : if you combine two dissimilar dB values, you won't gain that same 6 dB output (even if both subwoofers were in phase) ?

What I know about coupling and maximizing output is that in order for that to happen both subs would need to be in phase and in level.

Just want to have some discussion on this from the physics majors....
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Old 26th June 2009, 07:42 PM   #2
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Anyone have any views on this ?
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Old 29th June 2009, 09:49 PM   #3
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Join Date: Jan 2008

The combined level of two non-correlated dB values varies from a maximum of 3 dB gain to less than 1/2 dB gain over the larger amount when the difference is 10 dB.

Do you have a specific question?
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