Hello Axman
I don't think break-in is an issue with the M22s. As stand alone speakers IMHO they are inadequate. However, with a decent (quick) subwoofer they do their transformer thing ... all of a sudden they sound like sweet sounding full range speakers. If your sub doesn't integrate perfectly, the speakers sound like they are producing everything from sparkling highs to deep lows. If your sub does integrate perfectly, the speakers disappear and you are left with that glorious WALL OF SOUND.
Personally, I think a good tube amplifier will help in this quest, though the silver faced, Kenwood flagship KA9100 integrated amplifier does a pretty good job in its own right.
The garage stack consists of a KA9100, a Kenwood KT8005 stereo tuner and an Ah! Njoe Tjoeb tube output CD player.
BTW, as to subs, I don't think it is that important that the sub produce 20Hz or lower, but rather that it be quick, that is, not muddy, no 'overhang.'
