The GM's have MUCH more bass than the GH, but the bass in the GM is very very tight and I have no need for a subwoofer in my LARGE room. I have the M's about 3 FT from my back wall, 7FT apart and slightly toed in. They are about 2 1/2 FT from each side wall.
For my electronics, I have been using AES Six Pacs and an AES DJH pre for the past year after about a dozen buy/sell sessions. The Six Pacs put out 50-60 watts in triode mode and the sound is absolutely amazing.
I used a Cambridge Audio 840C for my CD playback and that will eventually be upgraded to a Cary 303/300. My pre will be upgraded to a SLP98P as that is my fave pre EVER.
Anyway, I sit here now listening to Led Zeppelin III and the sound blows me away, even after living with this for a year.
Diana Krall, Allison Krauss, and even ACDC sound amazing on the M's. The G's did not do so well with heavier music.
My speaker cables are very inexpensive and from Clear Day cables here on Agon. I love them. I used to own $2500 cables and feel that for the money these cables only give you an extra 5% increase in sound quality.
My Ic's are Cardas.
Anyway, I really love the G's but for sound, I love the M's even more. Remember, I had them side by side in my room which is LARGE and rectangular. I do not have the dimensions.
I also prefer the M's without the grilles.