Crion,

What Amphion speakers were you listening to with the DD12?

I own Amphion Krypton speakers and a REL Stentor III but have recently played with a Velodyne DD12 sub at home. The RC was interesting but in my room (24' X 11' X 8')the bass response on-screen display indicates that I have bass response down to below 20 Hz with the Kryptons only with a peak around 25 Hz. The rest of the plot is pretty linear with dips at 32 Hz, and 80Hz.
I find that my REL integrates very well (high level connection from power amp) and I cross over at 27 Hz (Kryptons have a published -3db spec at 22Hz!) I don't have the gain set particularly high and use the sub to augment the in-room bass response.

Steve

Steve