Can you elaborate on not making "acoustic sense".
Also, how well did the M80 hold up when used as L/C/R in your room?
I had them L/R, sides, and rear .. using them mostly in 6 channel stereo. never tried using a m80 as a center but In 7.1 application the sound stage was just horrible.. and in 6 channel stereo it was just overwhelming to get any kind of quality sound in the size room I had them in, if you want a really good sound stage and quality sound, it would be wise to use the right kind of speaker setup for the application... I did a lot of speaker experimentation , also using a bunch of vp150 also for surrounds (as per Joe vassello's advice)but found at the end the best sound achieved was with the traditional speaker application setup. I guess best advice on this is m80 are best used as mains.
