scott:

actually, after some thought, i would try this (as the cost and effort are very low):

set your surrounds to 'large'.
insert a pair of 50hz high pass FMOD at the surround amp
insert a pair of 100hz FMOD at the surround back amp
they're available from parts express (50hz=part # 266-270 and 100hz=part # 266-274, both at $25.90 a pair).

i don't know how they work, but i've used them and they work very well.
just a thought.

kevin: i looked up the aesprit 300c and they sure look good on paper! let me know, if you decide to purchase them, how they sound.