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In Reply to: RE: but what about the slopes question? posted by wazoo on October 25, 2009 at 09:48:27
I can only speak from experience about the MMG's.
In my view, any kind of generic Linkwitz-Riley electrical crossover will yield a too fat mid-range response because of the constant-voltage design. The transducers broad overlap and non-flat response sum to an acoustic response which is not flat when using an electrically "flat" crossover. (I did have some success equalizing it though.)
Thus, the vast majority of commercial units that implement generic slopes and don't allow separate adjustment of high/low turnover frequencies are not suitable.
I don't believe there's much to complain about with the 6db/6db electrical slopes utilized in the latest MMG's. Electrically, this crossover has a broad, deep dip in response, but the acoustic result is beautifully flat in my listening room. I did add a shunt capacitor in the high-pass section to lower its turnover frequency just a bit, but this was a minor change. A line-level version is, of course, better than a passive crossover at speaker level.
Anyways, I don't believe you're going to get significant improvement from your present mid/high crossover setup. However, optimizing your sub/MMG crossover might yield some significant improvements.
Taking some/all of the bass workload away from the MMG panels yields noticeable improvements. (Even without framing modifications.)
I much prefer dipole woofers to any box solution. My current setup utilizes MMG's with a 80Hz active crossover and woofer equalization mated to "H"-frame dipole woofers using two 10" drivers per side.
IMHO, I don't believe there's an MMG-based system anywhere that sounds better than mine. Terrific for all types of well-recorded music, but only lacks the maximum SPL capability that larger Maggies could provide.
My two cents.
Cheers,
Dave.
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