I don't know a thing about subwoofers so I'm looking for a little advice. I have always been a "no subs ever" type 2-channel snob, but I would now like to give one a shot. I'm looking for something that will work seamlessly with my restored Quad 57 ESL's. They have nice tuneful bass as is, but being the greedy audiophile I am, I'd love "just a bit more". My concrete bunker basement man cave is approx 14'x 26' with 7' ceilings. I have basstraps in all four corners, and a few OC 703 panels on the walls and ceiling. Also a few thick area rugs on the floor. My budget is $1500, and I am open to buying used. A fellow Quad owner suggested a Velodyne DD12. Looks like a contender, but I don't have a TV in my listening room so I wouldn't be able to use the setup software, also looks like this sub is a bit old/outdated, although Ive found a few that are within my price range at about $1200 used. Are there better, more modern options out there anyone could recommend for me? TIA!