Your 2310 will work, I drove my M80s with a Denon 1804 before I picked up my 3808, another M80 owner I know uses a 2105, you should be good for awhile with the 2310, at least till upgradeitis strikes again
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I made a typo when I said midrange, I meant to say upper bass. The midrange on the M22 and M80 is nearly identical.
The PB12 actually has a bit of a bass bump around 50-60hz which gives it a little more punchy feel than other subs I have heard. The box store subs generally, have a loose bloated bass that echoes on forever which can be OK for movies, but terrible for music, IMO.
