I have a SB Classic hooked to a Klipsch Promedia 2.1 setup. This has
provided good quality sound for a long time but the amp in the subwoofer
burned up. This is typical failure mode for the Promedia system. Rather
that replace/repair the Klipsch amp I thought to replace it with a Lepai
LP210PA 2x30W + 60W 2.1 plate amp.

To power the Lepai I used a 20vdc HP laptop charger which should provide
plenty of power. I converted the charger (3 wire cord) to a dc power
supply (2 wire cord). 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 isolated the blue wire and just
connected the remain + and – wires to a new power plug that fits the
Lepai.

The switchover to the Lepai was quick and easy. When I turned it on the
sound quality was excellent but with very little volume. The SB is set
to 100% output. 

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. Not
sure though if others were feeding a signal from a SB Classic.

Is there any way to up the gain on the SB?

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.
Thoughts?


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