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In Reply to: Suggestion to upgrade MMG Crossovers posted by sferraro963 on August 16, 2015 at 10:17:03:
So for MMG's you have to think about your investment.
(1) Drive them with an a"Audiophile" Amplifier and use the standard crossover. Advantage: no pain no trouble - retain audiophile credibility Disadvantage: Always worried if your a getting the best sound.
MMG's are the best value and do all the "Right" audio reproduction thing (frequency balance (mostly) - great imaging b/c of dipole and line source design minimzed nasty first reflections.
The weakness in the basic MMG design is [A] the lack of efficiency, [B] a bass bump at 55-60Hz (maybe not that noticeable in some rooms), and a little too bright (a matter of taste and where they are pointed)
$600 a pair! Amazing.
(2) if you want to remove the sock and raise the speaker and like wood working a bit, as I do, making a stand to raise speaker a bit is fine, and you can replace the crossover components to higher quality components while you do that.
(3) I'd hate to spend too much money on an MMG tweek or amplifier(s) unless you really want to "play". Then you jump into active biamping. and if you are going to go there then optimization is our goal, so don't even think about "staying Stock". For about $1000 get a pair of Crown XTI1002 Amplifiers. These have Built in DSP's for Crossover, EQ, Dynamics, Limiting and even Subharmonic Synthesis if you get a third one (or a xti 2002) to drive a pair of subs.!
Advantages: You can play like crazy with optimization. and you get a really clean rear side - no bumpsin the fabric. In fact, I used a single 4-pole Speak-on socket at the rear of my MMG's. Disadvantage: You can play like crazy with optimization: this is not for the faint hearted - and don't even think about it if you are going to tune "by ear" and not by measurement. Guarantee you will screw up. So but a good measurement tool.So my final setup was 24dB/octave L-R at 850Hz, in phase drivers, I HP to my subs at 6dB/octave @ 100Hz (with a parametric EQ on the earlier mentioned "Bass Bump"). I use Dynamic compression above a 15 Volt threshold on 6dB slope that works out to be about 85dB at 100Hz, so the peak output of the LF panel won't exceed 100dB RMS at lower frequencies. I use to use a little high frequency EQ as well - but now I use a tweeters in, 45 degree toe in arrangement that provides a natural off axis EQ. There is a delay in there too for the tweeters - but I am sticking with the delay calculated from on tweeter axis at 2 meters. Finally - because the amplifier offers memory locations I have a presence eq setting that operated on the HF driver only that give me a 2dB Boost or Dip to aid in image presentation with some recordings. I can also switch over to something that somewhat resembles the original factory crossover.
As I said, Active EQ not for the faint of heart. Oh, and using Crown Amps and Speak-on and cheap ($30) four pole cables to each amplifier completely ruins your audiophile credibility - if that's important to you.
The subs use a 24dB/Octave LP Crossover at 85Hz, and a few mild Parametric EQ notches for room modes. My subs are at the sides of the room.
I set up each speaker crossover (the one around 1kHz) individually at first using a band limited (300-5kHz) pink noise test. Really helps to sort our crossover anomalies.
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
Edits: 08/17/15
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Follow Ups
- RE: Active Crossover Fear. - BigguyinATL 14:08:24 08/17/15 (0)
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