Combing effects: How real in "real" rooms?

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A common complaint about the W3-871S is that it seems to "run out of gas" at pretty low volumes trying to reach 100Hz...even with a second BSC driver. Of course, the first thought anyone thinks of is simply adding more drivers.

Using the JBL line array white paper as a starting point, comb lines begin at 4520Hz and become severe at 9040Hz. With room reflections, how noticeable is this?

Furthermore, supposing it is very noticeable, what about introduction rear-firing "ambience" tweeter similar to Von Schweikert designs? With proper dispersion this could go a long way to minimize the in-room audibility of combing.

Thoughts? (Think of how dynamic and loud 4 TBs would be instead of 1)

Stephen
 
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