In Reply to: Pinging gurus ... dipole cancellation question? posted by andyr on January 24, 2006 at 14:01:48:
Having played around with different 3-way Maggie crossover schematics in lspCAD, I see the overall frequency response invariably has a hump in the 100-200Hz region.This is achieved by positioning the -3dB LP & HP frequencies closer together than what theory says is "normal".
My Q is ... did Magnepan do this to compensate for dipole cancellation?
That's a good possibility. Maggies achieve the bass boost needed to overcome dipole cancellation through a combination of the bass panel resonance, driver efficiencies, and the crossover.
I also note some people who've tried 24/24dB L-R active crossovers in place of the external passive, have not liked the result. Could it be that the flat frequency response over this bass/mid crossover region, which is produced by a 24dB L-R setup, results in the bass being too thin because of dipole cancellation effects?
I personally believe Maggies may benefit from electronic bass equalization. This would allow a more conventional crossover design since the crossover wouldn't be trying to do both the splitting and bass boost at the same time. It would of course require bi-amping which would price the electronics out of Magnepan's intended market.
Ed
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Follow Ups
- I'm not a planar guru, but... - EdG 01/24/0620:17:10 01/24/06 (4)
- Where are you, Grin?? :-)) ... - andyr 23:32:34 01/24/06 (3)
- bass EQ - EdG 18:18:19 01/25/06 (2)
- Re: bass EQ - gymwear5@hotmail.com 19:51:58 01/26/06 (1)
- Re: bass EQ - gymwear5@hotmail.com 20:02:36 01/26/06 (0)