Hi, I'm looking to add a subwoofer to the system described here: http://www.hometheaterforum.com/htfo...threadid=89945 (MartinLogan Scenarios, Adcom GFA5400 amp, Luxman D-375 CD player). I bought a Velo CHT-120, which sounds *very* good to me. Then again, all I'm used to hear is the bass of my rumbling Definitive Technology PF15, so it might or might not be very good bass. My dealer (a terrific guy) told me I could exchange my Velo for another one: an SPL-800 (and he would take the CHT-120 at the price I paid, even if I have used it for two months!!!). He told me the smaller sub would be a better match for the MartinLogans because of its speed and power. I listened yesterday to both. When he plugged in the SPL-800, I noticed how "light" the sound was. Not like a sub, but more like a normal woofer. Then, when he plugged the CHT, it sounded as if it had 2X the output power of the 800. But my dealer told me to listen closely to the bass notes. That's when I noticed the SPL-800 sounded *exactly* like the real thing, while the CHT-120 had a different signature - it sounded low, powerful, but indistinct. The 800 was fast, snappy, detailed, but it didnt' carry a lot of weight. So, my question is, anyone has any practical experience comparing both? I think the 800 is a better match for the Logans, but it could as well have been that the CHT tone controls were misadjusted (I didnt' have the time to check this). Thanks for your opinions!