I use an Audio Art 4 channel with built in crossover and a small 25amp power supply. I use a CAI passive pre for volume control and a Music Streamer II usb DAC. Its a bit unorthodox but sounds fantastic! I built some mini monitors using 3" Tang Band bamboo wide rangers and a sub with a 6.5" Tang Band neo sub. I screwed the amp to the sub enclosure and set the power supply on top with the DAC. The passive pre, with its ALPS volume knob sits, on top of my desk. Wallah!!