Based on extensive and purely scientific research on this forum, I've decided I need to replace my HTD Subwoofer with an SVS, and I need an EQ to tame some peaks and valleys in my room. As far as EQ, it looks like the Behringer DSP1100 Feedback Destroyer ($129) based on several recommendations. Anyone second, or dispute, this recommendation ? As far as the SVS, I was thinking 25-31CS, but now am considering the 20-39. However this is in a big room (6500 ft^3 not counting adjacent rooms without doors). I understand that the 25-31, while obviously giving up some bottom end, will give overall higher volume for the same amount of power. So maybe the 25-31 is the better choice? I will be driving it with an Adcom GFA5400 amp (200 w/channel @4 ohms w .018% THD) Now does anyone want to convince me to send my entire HTD Level III 5.1 system back (I have until Jan 4 on the trial period) and replace it with some other set of 5 speakers in the $500-700 range? Its not that I'm unhappy with the HTD speakers in general; just due to sloppy bass (I'm sure primarily a room response problem) I haven't really been inspired by them.