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Good job of identifying the problem. Now we just need to dig a little deeper. Does the dip stay consistent regardless of height also?

A 2" panel of OC703 is certainly capable of reaching way deeper than 400Hz. 2" with 1" gap behind has a coefficient of over .5 at 125Hz and 1 to 1+ depending on which specs you read between 250 and 500Hz.

Bryan
 

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OK. Just making sure. Predicting and real world many times don't really match up due to interference from tangential and oblique modes, walls not being 100% rigid, etc. If height doesn't matter, then you're correct in that it's purely a width thing.

To deal with that, you can use absorption on the side walls beside your listening seats to minimize those issues.

Bryan
 

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For 350-400hz, you don't even need the gap but you can if you want. 2" 703 is over 1.0 coefficient at 2" on wall (A mount)

Bryan
 
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