I kinda attacked the lower powered amp problem in a different way.

I have an integrated tube amp with 4 X KT-88s that puts out only 35 W/Ch in Triode mode; however, I went with a pair of M2s on stands & 2 X Axiom EP400 8" subs that put out up to 500 W/Ch RMS each for the heavy lifting down low.

Turns out that this is an absolutely wonderful combo for music only in quite a large space - articulate & powerful.

If interested, you can read about my quest here:

http://www.axiomaudio.com/boards/ubbthreads.php/topics/379990/Audio_Only_System_Renewal#Post379990

TAM