I'm driving the upper full range Betsy's and super tweeters with a Miniwatt SET amp and the bass Alpha's with a Denon AVR-1905 in stereo mode. The analog output from a Rotel RCD-855 is fed to the Miniwatt while the digital coax signal is sent to the Denon. The bass Alpha's use a Parts Express low pass crossover ( part # 266-442 ) to filter out frequencies above 80hz.

If you decide to duplicate this build and have questions please ask them here or send me a PM. One word of warning, once you enter the realm of OB there's no going back.