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RE: Agree to disagree.

What Tony said.

Check out this web page -- it compares monopole, dipole, and cardioid woofers. Note in particular the graph of the impulse response, all modes considered, near the bottom of the page. The benefits of the dipole diminish as you toe it in until at 45 degrees, it isn't much better than the omni, but I've found that in practice, with the moderate toe-in usually used, dipole bass is significantly smoother than monopole bass.

The downside of dipole bass is that you get backwave cancellation, so need more excursion and amplification for a given SPL. You also need large baffles, although they can be folded for a compact unit.

Another interesting possibility mentioned at the end of the page is to put the omni subs right behind the listener. He says that the variations that then occur are minimum phase, which means response irregularities can be equalized out. This would be effective only for a single listener, though.

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