I have two small speakers that came from a PC 2.1 speaker system. The sub/amp broke on that but the two RCA speakers still work.

Basically, I want to know what power amp I will need to continue using these small speakers as part of the PC.
The PC sound output's ~20mV (simple m/b soundcard), but the sound is far too low to be heard on these speakers. I could design/build a simple amp but I'm too lazy.

Any ideas? Thanks.