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If you like the sound of bipolar surround speakers, then that is all that matters. Just be aware that for them to produce their special sound correctly, they must be placed in very specific locations in the listening room (this is another reason I personally don't much like them).

This article may answer that question (though PSB seems like a cool company so I think they may be just using a specific test system of their own).

That is what a bipolar design is used for. The area between the drivers where there is no output because of the cancellation AND the directionality of the drivers (particularly the tweeter) - i.e. the "null" zone - is the same area that is suppsoed to be aimed at the listening area. This way the...

:confused: John: even if they were flat all the way down to 20Hz, speakers that are literally right next to each other (like the drivers in these surround speakers) and wired out-of-phase won't have any bass at all below @150Hz. So it wouldn't matter where each individual surround speaker is...

From the "bipolar" link on PSB's page for their S50 bipolar surround speaker (emphasis is mine): Just like with a conventional pair of speakers that are (usually accidently) wired out of phase, this will result in basically no low bass being heard.