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In Reply to: RE: Recomendations for subwoofer:Beveridge, ESL & USA Monirors posted by AJ on July 03, 2014 at 18:34:34
The line level capacitor will probably sound better than the internal high pass or an active crossover. It is just limited to the particular value of the power amp's input impedance.
Follow Ups:
The Dayton looks nice as a dipole, with EQ in the plate amp. I am also in a position looking for a subwoofer solution for the Quad ESL 2905.
I am reading into the Rythmik/GR solution offering.
http://www.rythmikaudio.com/GRci.html
It's a dipole based solution with a servo enabled paper cone drivers from GR. This is said to go down 14 hz, I heard some happy stories in Audio Circle.
Look forward to more interaction and discussion on this domain.
That Dayton subwoofer is a bipole configuration, not a dipole......two completely different things.For you Quads, a dipole woofer would probably be the best solution. 14Hz claims are pretty silly for any dipole configuration. If the cabinets are anything close to reasonably sized the equalization requirement and woofer excursions are massive to counter the front/back cancellation. If you acoustically separate the front/back by larger distances you can possibly achieve lower response but then the system starts to act less as a dipole and more like two separate sources that are out of polarity with each.
Your room will play a large factor with any type of woofer system when you get down to these frequencies.
Cheers,
Dave.
Edits: 07/04/14
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.
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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