Micah, I think you've got it.
It would be interesting to EQ a good sub like my PB13 to have an output bump in the 50-80hz range just see if it can produce that chest pound feel.I guess this would be a good reason to run multiple subs above an beyond the normal 2-4. I can remember the PB12-nsd had a chest thump feel to it and it does have a minor bump in the 50-60hz range.
I also know the bass Micah is talking about from the M80s, they had my room rattling AND had some pretty good chest pound when I had the A1400 hooked up.
Roar, I can assure you the M22s won't have any great change in sound with a more powerfull amp. I ran them with the A1400 and the only difference I heard was the highs had better seperation and were cleaner at louder volume. I actually thought they sounded a little anemic due to the lack of bass they produced because the mids and highs over shadowed them so much, they really needed a sub when hooked to the outboard amp.
I know you weren't wowed by the sub you tried, unless it was a quality sub like the Axiom ep350 and up, Paradigm dsp series or the SVS subs or of similar/better quality like we mention here, you were not getting the full picture. I tried many subs out and none were as good as those we constantly bring up on this forum. I feel the Paradigm DSP series is quite possibly the best bang for the buck along with the EP350.