In Reply to: MMG Crossover Upgrade (yeah, another one) posted by wazoo on December 7, 2006 at 18:04:14:
I played around with different values settled on the following components. The basic thinking on the current setup for the newer MMG setup is this: the tweeter section is essentially the same as the MG 12, but the woofer is not. Using the MG12 as a starting point, I made an adjustment for woofer panel impedance (~5ohm on MMG vs ~4 ohm on MG12) to maintain approximately a Bessel lowpass. Then I raised the crossover point to a point between the old MMG and the MG12. Then I just played around untill it sounded right. After playing around with different cap values and types, I also ended up with a slightly smaller cap than on the MG12, which I think sounds better in the crossover region.After all the trial and error, here's what I ended up with:
Lowpass (from Parts Express):
*2.5 mH Erse super Q inductor- lower resistance makes a big difference in bass frequencies
*33uF Jantzen- cheap capacitor, wouldn't use it in a series filter as it tends to sound nasal, maybe even harsher than Solen, but works fine in the lowpassHighpass (from Allied Electronics):
*30uF ASC x386s- I love this cap- metalized polyprop in oil. It may be have been designed for industrial but it has a warm yet clean sound- no added harshness like some of the other caps I've used. I think they beat out a lot of $$$$ "audiophile" caps- and they are cheap so you can try them out.
*Roederstein bypass- can't remember the value- just your basic bypass cap. Makes a little difference- nothing dramatic, but enough to justify spending a couple of bucks on them.
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Follow Ups
- Try different component values - lne937s 13:10:38 12/08/06 (5)
- Re: Try different component values - wazoo 20:47:35 12/08/06 (3)
- Now you're getting IT! - RickeyM 21:16:22 12/08/06 (2)
- Re: Now you're getting IT! - wazoo 07:38:51 12/09/06 (1)
- Re: Now you're getting IT! - Dawnrazor 08:27:08 12/10/06 (0)
- Re: Try different component values - Rod H. 13:28:23 12/08/06 (0)