It's possible that this little plate amp needs more gain to work with - is should have plenty of power to crank the Promedia equipment to at least comfortable levels. If power isn't the issue I'll swap out the Lepai with another and see if it's a cap or other discrete component issue on the amp. I'll try hooking my DC power supply up first set at 22vdc and let the amp draw whatever amps it needs - that should eliminate my hacked power supply as the culprit. I use a Topping E30 but others have used the Behringer DAC tips. If you don't want to mess with the caps then you can use the digital output via a DAC to the amp. Thoughts?Try using another source to feed the amplifier to rule that out. I do have a spare Sony receiver I could try and a DC power supply to see my 20vdc hacked power brick is just not delivering enough power. Is there any way to up the gain on the SB? Not sure though if others were feeding a signal from a SB Classic. I’m confused because this Lepai conversion has been done by others and it should have plenty of juice to produce more volume than this. When I turned it on the sound quality was excellent but with very little volume. The switchover to the Lepai was quick and easy. I isolated the blue wire and just connected the remain + and – wires to a new power plug that fits the Lepai. The power plug on the charger has red (+), black (-), and blue (sense) – the blue wire is meant to send the laptop’s battery state back to the charger. I converted the charger (3 wire cord) to a dc power supply (2 wire cord). To power the Lepai I used a 20vdc HP laptop charger which should provide plenty of power. Rather that replace/repair the Klipsch amp I thought to replace it with a Lepai LP210PA 2x30W + 60W 2.1 plate amp. This is typical failure mode for the Promedia system. This has provided good quality sound for a long time but the amp in the subwoofer burned up. I have a SB Classic hooked to a Klipsch Promedia 2.1 setup.