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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: Oh MeGodz...IT'S ALIVE!! posted by pictureguy on August 28, 2010 at 23:20:52:
Well, they could actually go more than four ways..... :)
Isobaric Magnepans? This isn't an Isobaric configuration fellas....nor is it intended to be. There are no sealed air cavities and there's no attempt to lower bass response or reduce box size by one-half or any other principles associated with a true Isobaric configuration.
All I've done so far is cut a piece of plywood the same size as an MMG frame, routered a "hole" in it the same size as the MMG transducer membrane and then rebated both sides so the transducer frames are flush. The two transducers are mounted mylar-to-mylar and temporarily held in place by spring clamps. There's a gap in between sufficient that possible magnet north/south conflicts are not a concern and the cutouts for the (stock) terminal strips (which are face-to-face) preclude any air sealing of the internal "cavity."
Both elements of the two transducers are wired with opposite polarity for a dipole configuration. (I never even considered wiring them in a bipole configuration....that seemed pretty silly.)
As you know, one MMG transducer (left) has a single button and the other (right) three buttons that create six different panel tuning "zones" so the L/R system won't drone in a narrow range in the bass region. Since I've coupled a left and right transducer together both speakers.....assuming I build another one.....would be identical in this regard. I don't believe this difference in "tunings" between two different transducer panels in the same speaker will be detrimental.
It's just proof-of-concept at this point. I don't think it will be practical ultimately considering the simpler alternatives and the necessity of two pairs of drivers and more complicated construction scheme. Just something to play around with since I have a "spare" pair of MMG transducers.
I am convinced the sandwich scheme is the way to go however. My existing speakers (the ones you've seen the photos of) can also be improved further by removing/reducing some of the variables in that configuration. That's on my plate also.
Cheers,
Dave.
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Follow Ups
- RE: Oh MeGodz...IT'S ALIVE!! - Davey 08:07:34 08/29/10 (1)
- RE: Oh MeGodz...IT'S ALIVE!! - Satie 23:12:29 08/31/10 (0)
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