for less tha $2500, you can purchase a brand-new pair of vmps larger subs, a brand-new tweeked marchand active x-over, & new-or-used decent high-power amp(s) of your choice. this system wil be easy to mate w/most any speakers, and all except maybe a pair of the most expensive offerings from muse/rel/etc., won't touch the level, or deep, quality, textured, output of this system. the only system i ever heard that equalled the bass response of the vmps' as described, was the bass response of a pair of infinity irs-lll's, i heard several years ago. this is my opinion, of course!
regards, doug