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I'd call it a compound dipole -- advantages the same as all dipoles (reduced excitation of some room modes)

Posted by Richard BassNut Greene on October 31, 2006 at 09:21:31

In Reply to: What Are The Advantages To A Quadrupole Sub? posted by thetubeguy1954 on October 30, 2006 at 14:25:57:

Legacy Whispers, with the best sound quality I've ever heard in a private home, used 15" compound dipole bass drivers up to 300Hz. The drivers were mounted back-to-back on dual open baffles that were less than three inches apart.

The speaker you reference has more distance between the two baffles but that should not make much difference with the long wavelengths of bass frequencies

Dipoles and compound dipoles have about 5-6dB less excitation of side-wall-to-side-wall and floor-to-ceiling standing waves.

The front wall to rear wall standing waves will have the same excitation as with monopole bass designs.

Reducing excitation of some standing waves usually makes the effects (peaks or nulls) of the remaining standing waves easier to notice and more annoying than before ... so there's no guarantee that dipole bass will sound better than monopole bass in all rooms.

But in most rooms used for home audio, dipole bass has an inherent and significant advantage over unequalized monopole bass.

Dipole bass has such an advantage over monopole bass in most rooms that the only fair comparision to dipole bass is parametrically equalized monopole bass (all bass peaks at the primary listening position eliminated).

The penalty for dipole bass is the need for extra drivers, equalization and more power.
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Richard BassNut Greene
My Stereo is MUCH BETTER than Your Stereo

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