Hi, Check out TBI subs, there is a dealer selling some demo's on audiogon. They are probably the best sub for ribbons that I have heard. They truly are different in their approach than most subs, just take a look at their website for how they achieve building subs that are extremely fast and can keep up with ribbons and other speakers that are usually hard to integrate a sub with. I have a pair of their smaller subs run in stereo with great effect!!
Check em out!!! Tish
Check em out!!! Tish