What sub do "U" use ?

A pair of Linn AV-5150. They are used in a 2-channel system(stereo subs). Sound is great, the crossovers are set at 40hz.

My favorite one is Meatball-Parm...

Marakanetz, is that the Meatball Parmesan mkII or mkIII? I feel the extra cheese on the newer version helps firm up the bass overall without sacrificing the lowest octaves.

I was using a half-assed set up that served double-doody for HT and music comprised of an NHT SW3P passive fed by a Paradigm X30 and Bryston 4B. Now that I changed to floorstanders that sub set up is used for HT only. I have been considering a REL Stadium III or Stentor III somewhere down the line.

Linn AV 5150.....beauty and a beast!

B&W AS4500 which they don't sell. 450 watt class D built in amp, lok like a piece of furniture. I use it for my home theature nosubs in my two channel system. Has a 15" woofer pported down to the floor. My kids call it feel avision because it shakes the house with distorting. If you can go a couple of grand check out B&W the sub that replaced mine has the same 15" speaker smaller cabinet and a 1000 watt class D amp. No disrespect but velodyne which is popular isn't even close. B&W will also helpp you with the wife factor as they look sharp.
Happy listening Walkelin