Tom, the M22's will play down to 30hz at 70db according to the frequency response curve for those speakers. The M22's should be just fine with a full signal, as long as the volume was not too high. Brent or JC would probably be able to answer this specific question about the M22's and having them play "full frequency". The speakers i have in my bedroom are similar to the M3's, and they are also provided with a full signal. For that room (10'X10') they are just fine.
I though the AX2's were towers, hence my M60 story.
