OK, at this point I've set the crossover at 40hz; it sounds fairly transparent that way. However, no matter what I seem to do, I get a dip in level right around 65 hz. I think I must have a room problem. Not only that, but if I play a test tone at 65 hz using only the MMGs, one of my MMGs (the one closest to the corner of the room) rattles rather loudly. It only stops if I grab the frame of the speaker and hold it firmly.

Anyway, I made a series of test tones starting at 30 hz and increasing in 5hz steps up to 160 hz. I've got it set so that (to my ears anyway) it sounds as flat as possible, excepting for the dip at 65 hz; I'm not sure what to do about that.

I also made a sweeping/rising test tone starting at 30hz and increasing very slowly up to 22000hz. If I have any kind of volume coming out of the amp, it's a freaking disaster! There's huge peaks and valleys in the volume, stuff is rattling and rumbling all over the place; criminy, thank God my music doesn't sound that bad! Still, I sure wish I knew what to do to even it all out and to get rid of the rumbles and rattles.

I tested the MMGs by themselves, and they don't really start to drop off until about 60-55 hz. Shouldn't that tell me what the crossover frequency should be, if I could figure out the slope of the MMGs as compared to the subwoofer? How would I do this mathematically?

Thanks,
Mike