This amplifier is equipped with the "Audiobah" Model AC1308 1.0 TPA3116D2 circuit board. This is the first of three amps I will build with this board. Listening tests confirm it is a keeper. Silky smooth midrange and highs, with the well known tight bass of the 3116. As I've written before, I won't sell an amp with a board I wouldn't use myself in my rig. I recently discarded three different 3116 circuit boards that I didn't care for. Parts on this amp include side chassis mounted, five way, gold plated, insulated binding posts, gold plated RCA inputs, genuine Fender chromed brass volume knob, Alpha volume pot & twisted solid copper signal wiring. Hand made little chunks of audio art. No two ever the same.