I've not been on Audiocircle in quite a while, but thought I might chime in as I have what may be the only pair of BOW's with double 12's in each cabinet. They are fantastic subwoofers, especially with Daedlaus speakers. I drove them for a while with a Bryston 4B and a modified Behringer 2496, but now using a pair of Dayton SPA 1000's and while not necessarily audiophile approved, they are fantastic sub amps and have quite a bit of adjustability built in to them. Probably around 500-700 watts per side and I guess kind of a hybrid power supply with a good sized transformer and what they call a "Patented tracking downconverter power supply for high efficiency". They are rated to be 86% efficient, so obviously part "Class D" in the power supply. The amps weigh about 17 pounds each, out of their packaging. Call it whatever you want, but the results a whole lot better than the Bryston/Behringer were. I run my Ulysses full range and have the subs LP crossover set at right around 30 Hz, which is the lowest LP available. I'm not sure of the crossover slope, as they don't list this, but they work great and connect directly to my amp with about 1 foot of wire. I had a guy over who used to be the sales manager for a famous sub manufacturer and he was blown away by the subs. Me, too.