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In Reply to: RE: Recomendations for subwoofer:Beveridge, ESL & USA Monirors posted by Davey on July 04, 2014 at 05:39:56
The woofers in the Dayton sub can be rewired to act as a dipole too - in a near isobaric loading. The stock bipolar config should be very dynamic and would be pretty much a point source in the freq range it covers.
The dipole config would require some EQ to counter cancellation.
As Davey noted, the GR research sub, though a better fit than a bipole for an ESL, it is still going to be a dipole and you can probably get near flatness at low volume down to below 20hz due to EQ, I doubt that you would be able to get that extension at high volumes.
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It's completely unworkable, and there's nothing Isobaric about that configuration since it would be open on both sides.
Anyways, the amplifier provided does not have the necessary equalization and you'd have a vibrating mess with all the excellent (inherent) force-cancellation of the stock bipole configuration completely undone.
Absolutely nothing wrong with that subwoofer system used in the conventional fashion. That's the way it was designed to work, that's the way it should be operated.
Dave.
Do you think it would do any better with one driver installed "inside out" rather than wired in reverse?
Obviously you are right about losing the vibration cancelling of the original bipole design, which is why it is so deep and tight and why I like recommending it.
Yes, you'd achieve a little bit of distortion reduction......but only if the bipole movement configuration is maintained. However, it would look ugly as hell. :)
OTOH, mounting the magnets inside the box (per the stock setup) would allow them to be physically coupled together inside with a piece of wood glued securely to both magnets (making sure not to cover any vents.) That would yield a marginal improvement to the force-cancellation configuration, but wouldn't have the even-order distortion reduction.
That's the way I would do it.
Dave.
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