Wondering this as well. Specifically what power supply you used, how you got rca signal to the amp, and how volume control works for the sub. Good work!
Volume control for the sub is a little different. See with your computer speakers like mine I just use the logitech thing and adjust the volume. Well with the sub you got to use the computer volume. So I just set the gains at 100, but now I keep it at 85. Then when the sub is on and everything is on I just adjust the bass with the bass knob that came with the amp.