dipole surround XO design -Visaton

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New here, so please bear with me......

I'm in the planning stage of building a set of dipole surround speakers and I have a couple questions.

I came across a german website that some of you may be familiar with, www.visaton.com, that has some kits similar to what I I'm looking for. The interesting thing about this site is that they show construction drawings and crossover designs without having you purchase anything.... Anyways, their crossover claims to operate the woofers in phase below 200hz then out of phase above that.

Here is a quote from their website:

"The all-pass circuitry in the deep-bass department ensures that, at frequencies above 200 Hz, the woofers are also cross-connected, and below that level they work in synch. This prevents the bass completely cancelling itself out."

The webpage for this item is at http://www.visaton.com/english/artikel/art_698_7_31.html

The crossover schematic is at
http://www.visaton.com/english/bildgross/698_bweiche1.html

Does anyone have any comments on this kind of design? Does it work? Is it noticable?

Thanks in advance
-John
 
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