I bought a used 5.1 system for my PC and everything was fine until I tried it out. The bass knob basically works as an on and off switch for the sub, it's either full bass or no bass, this is a huge problem for me as I live in an apartment building. I was wondering if anyone knows of a free equalizer that I can download. Using that to reduce the bass is probably my best option. Also, I must mention that this is somewhat motherboard related as I need help plugging the headphone jack into my desktop. ;-)