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In Reply to: Thoughts/questions... posted by grantv on October 19, 2006 at 14:09:12:
I would place the top MMG on the stack upside down, that would reduce the gap between the two drivers (as baffle is wider on the bottom than the top) Just make sure the the tweeters are on the same side of the panel and are in line with each other.I would also think about biamping with that setup to take some of the stress of the amps. Although many amps are stable into 2 ohms, they generally have the lowest distortion at their rated power (as that was what their parts and design were optimized for). For example, UcD amps and some pro amps perform best into 4 ohms, most home amps perform best into 8 ohms, and some tube amps work best into 16.
So, the woofer panels (which measure over 5 ohms each) could be wired parallel and use a pro amp, as it needs the most power. The tweeters (which measure less than four ohms each) could be wired in series and use a lower watt tube amp with some adjustments to the gain.
I just got done doing a crossover upgrade to my MMG's and was thinking about stacking, but I don't have enough space in my current apartment.
Follow Ups:
TBH, I assumed that he would have done that.
Also agreed on using two amps (biamping or just one per pair), the pro maps may be OK, hard to say, never used any.
Yea, I assumed top-to-top also. Measuring mine, that makes about a 6.5" gap between the tweeters. I'm still a little concerned that this gap might be audible for critical music listening if a person's ears were near or on axis of the gap, but for HT perhaps it's not important.I'm curious enough about this to try it myself, but my ceilings are about 4" too low!
Rod,COuldn't you just take the panel out and build a frame around them.
THen there would be no gap, and you could better deal with the "staples" issue.
I bet you could easily shave off 4 inches with that approach.
I agree, that would be the way to go for stacking. I just measured and the tweeters would be a little over 3" apart mounting the panels like that. The panels themselves are about 41" tall. With frames perhaps the entire speaker could be made about 86" or 87" tall.
The idea just makes me wish Magnepan sold bare panels for DIYers.
Hey Rod,As we established a while back, I hav ethe OLD tweeter config.
DO you think stacking them wiht the new one would be a big deal?
DR:> As we established a while back, I hav ethe OLD tweeter config.
> DO you think stacking them wiht the new one would be a big deal?
Wow, I have no idea. Intuitively, it seems like it would be better to use the exact same speaker top and bottom. Whether anyone could tell they were different by listening.....? What makes it even more of a shot in the dark is that I've never heard of anyone who had done an
A-B of the two types. AFAIK they could sound almost exactly the same, or radically different.
Yeah, I know it is an unknown.I just can't imagine 2 extra traces making a difference one could hear....but I have put little sand bags on the timing crystal in CDPs and heard a difference, so who knows.
If I was to do this, I would have to either buy old ones, or buy 2 new sets...
them in series or get another 2-4 channels of amplifications depending on whether I bi amp or not?
You would be the pioneer on this! I suppose it would depend largely on your choice of amps.
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