Derek, I only have a small handful of drivers left now, and 801AA, and 801A, and a pair of Altec 604G's. I never tried the UREI 6500, I've been a Hafler fan for decades and use them for everything above 90 hz. ////// Mr Widget, dad is still heavily involved in the hobby, he spends most days tweaking his system, which these days is primarily comprised of B&G planar midrange and tweeters, Thiel 8" drivers (which he bought a ton in bulk when they were selling excess stock), and a mix of JBL and EV 18" drivers (where he has 8 currently in the system).