Not to hijack the thread, this is a perfect spot for my question. I have M40s for mains with a CS20 center and M30s for surrounds (5.1), would there be a benefit of pushing the speakers back (M40s as sid surround and M30s as rear surround) and making M60s or M70s the mains? I'm been considering this as a possible upgrade. My only concern is the floor standers would have to bee off the ground.
For a sub, if you're a DIY kind of person, I highly recommend Bill Fitzmaurice's Tuba HT. They're quite large, but unbeatable in value.