Hi
I have a pioneer receiver and a pair of technics speakers

the setup is : PC- audigy se with spdif out (i/o module) - optical cable - pioneer vsx-d512 - speakers

the probem is that I can't hear a true/clear bass

what should I do ?

the receiver has a subwoofer preout ; can I use it ? is it gonna work in stereo mode ? mp3, wma ,etc

How can I improve my sound expericence?