Hello inmates from a new arrival; may I request some advice?I bought a pair of MMGs a number of years ago and generally like them. The one quality of their sound that bothers me is their rather forward, if not downright "honky" upper midrange. I've ordered parts to upgrade the crossover with hopes that this will help - some of you have suggested that it will.
Currently, they are on a pair of steel stands which I constructed for them. I also gutted the cheezy connectors, fuses and such in favor of straightforward and soldered wiring. The work I've done thus far has resulted in relatively subtle improvements in sound. For the money of the crossover upgrade, I'm hoping for more!
After much reading, I decided to install the original (mine have the newer, simplified version) MMG crossover configuration in these speakers - just using quality components. There is a great deal of variation in the crossovers other inmates have installed in their MMGs. I'm simply following the official (1996) Magnepan drawing - 2.2mH Alpha-Coil inductor (14AWG) with a 24uF (drawing indicates 25uF) Sonicap shunt for the low end and a pair of paralleled 12uF Auricaps for the high end.
Can I *really* expect a solid return on my $250 investment? I desperately want to tame the midrange of these otherwise sweet little speakers. Have I missed something regarding the values of the components? I've read a number of posts specifying 48uF (~50uF) of shunt capacitance on the low end crossover as well as much lower inductor values. I'd also like to know how far from the steel plate (swivel base) under the floor of the crossover box the inductor must be placed. Finally, I'm a bit nonplussed about the phase issue - with such a crossover configuration, there is no way to have the low and high end drivers in phase (reversing polarity to correct a 90 degree phase error only creates an opposite 90 degree phase error) - or have I missed something else?
Any information which a more knowledgable tweaker can provide will be greatly appreciated.
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Topic - MMG Crossover Upgrade (yeah, another one) - wazoo 18:04:14 12/07/06 (40)
- Are you sure it's not your upstream components causing... - wgallupe 16:39:17 12/08/06 (4)
- Re: Are you sure it's not your upstream components causing... - wazoo 20:16:35 12/08/06 (3)
- Re: Are you sure it's not your upstream components causing... - Rod H. 09:54:26 12/09/06 (2)
- Re: Are you sure it's not your upstream components causing... - wazoo 10:10:35 12/09/06 (1)
- Re: Are you sure it's not your upstream components causing... - Rod H. 10:38:46 12/09/06 (0)
- 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)
- Re: MMG Crossover Upgrade (yeah, another one) - jjcarr 07:29:11 12/08/06 (0)
- Re: MMG Crossover Upgrade (yeah, another one) - ThomasW 20:08:18 12/07/06 (3)
- Re: MMG Crossover Upgrade (yeah, another one) - Rod H. 07:10:46 12/08/06 (1)
- Re: MMG Crossover Upgrade (yeah, another one) - ThomasW 08:00:54 12/08/06 (0)
- Re: MMG Crossover Upgrade (yeah, another one) - wazoo 20:46:47 12/07/06 (0)
- Re: MMG Crossover Upgrade (yeah, another one) - Dawnrazor 19:26:21 12/07/06 (17)
- Re: MMG Crossover Upgrade (yeah, another one) - wazoo 19:50:15 12/07/06 (16)
- Re: MMG Crossover Upgrade (yeah, another one) - Rod H. 07:35:13 12/08/06 (0)
- Re: MMG Crossover Upgrade (yeah, another one) - Dawnrazor 20:16:47 12/07/06 (14)
- Re: MMG Crossover Upgrade (yeah, another one) - wazoo 21:03:43 12/07/06 (13)
- Re: MMG Crossover Upgrade (yeah, another one) - Dawnrazor 21:51:58 12/07/06 (12)
- What I get to do when they let me out of MY cell... - RickeyM 04:57:38 12/08/06 (11)
- Re: What I get to do when they let me out of MY cell... - Dawnrazor 07:13:20 12/08/06 (1)
- Oh yeah, struts too! (nt.) - RickeyM 10:31:36 12/08/06 (0)
- Re: What I get to do when they let me out of MY cell... - wazoo 05:31:00 12/08/06 (8)
- Since we're sharing... - Rod H. 07:31:49 12/08/06 (3)
- Re: Since we're sharing... - wazoo 07:13:59 12/09/06 (2)
- Re: Since we're sharing... - Rod H. 10:07:25 12/09/06 (1)
- Re: Since we're sharing... - wazoo 10:34:09 12/09/06 (0)
- Re: What I get to do when they let me out of MY cell... - Dawnrazor 07:15:20 12/08/06 (3)
- Re: What I get to do when they let me out of MY cell... - wazoo 22:12:56 12/08/06 (2)
- Re: What I get to do when they let me out of MY cell... - Dawnrazor 15:56:35 12/09/06 (1)
- Re: What I get to do when they let me out of MY cell... - wazoo 16:35:54 12/09/06 (0)
- Re: MMG Crossover Upgrade (yeah, another one) - Rod H. 18:46:31 12/07/06 (1)
- Re: MMG Crossover Upgrade (yeah, another one) - wazoo 19:27:36 12/07/06 (0)
- Re: MMG Crossover Upgrade (yeah, another one) - RickeyM 18:28:21 12/07/06 (3)
- Re: MMG Crossover Upgrade (yeah, another one) - wazoo 19:05:05 12/07/06 (2)
- Re: MMG Crossover Upgrade (yeah, another one) - RickeyM 21:05:29 12/07/06 (1)
- Re: MMG Crossover Upgrade (yeah, another one) - wazoo 05:16:29 12/08/06 (0)