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I'm not a planar guru, but...

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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