I have moved the Parasound Halo A21 into the garage system. The PSB Stratus Gold I speakers really needed the power that the A21 is able to provide. After much patience I have been able to locally acquire a Forte model 1A class A 50 Watt per channel Nelson Pass designed amp for the main system. The amp is close to thirty years old and the previous owner used it sparingly as a back up amp. Bias is good and the caps seem okay for a piece of this age. The amp sounds fantastic and has a presence of a much more powerful amp.