I'll be deciding between the 20-39CS and the 16-46CS as that's about what I can afford while still paying off bills and saving for college. I've read the FAQ at the SVS site (numerous times), done searches here on the forum, and read reviews at various sites. I'll be powering it with that Part Express 250 watt amp. Right now I'm leaning toward the 20-39CS, but was wondering just how much slam it has at 20hz compared to the 16-46 and how much it can handle below 20hz. I doubt I'll be listening at reference levels, but may come close as I slowly upgrade my HT over the next year. As of now it consists of: Pioneer VSX-D608 dd/dts (will be switching to the Yamaha HTR 5490, or the Yamaha equivilant model that has pre-outs) Polk Audio RT55 fronts, RT35 rears, CS400 center (will be keeping all these, as I'm satisfied with their performance) Sony S530D (getting kind of old, but have not had a single problem yet with any of my 200+ discs. won't upgrade tell i get an HDTV) ...and a bunch of other components... I'll be living in either an apartment or small townhouse, so the HT/living room will not likely be very big.