Your Klipsch sub was producing a lot of harmonic distortion when you drive it real hard like that. This means it was producing tones that weren't in the recordings. The Rythmik was reproducing the music more like it was intended to sound like. Still, some added punch can sound good, so if you want to bring some more of that into the music, it probably wouldn't be hard with the Rythmik. On the Rythmik's amp, set the bass extension switches to 28 under 'freq' and high under 'damping'. Turn the PEQ on, and set the PEQ gain to +3, the bandwidth to max, and the frequency to around 60 hz. Leave both ports open. This will give you the most mid bass headroom and boost the frequencies associated with that kick-in-the-chest feeling. I would also run the sub hot in the AVR too, by 3 to 6 dB, that will pound you real good. This configuration does lose some of the deep bass extension though, so for movies you may want to change it.