home stereo speakers

All you need is a jack-RCA cable to connect the audio card's speaker-out to the amplifier's aux-in. That cable looks like this:
minijack_rca.jpg
 
There's no (actually very low) noise level in my speakers. It could be a feedback from the microphone. To reduce the noise level, mute the mic and line-in in the soundcard's volume settings.
 
I would say the feedback thing also. well, are you shure it's feedback? it might be line noise. if it's feedback, you can't have you microphone on when you're using your speakers. A thing that will help that, is do have the speakers not pointing to the microphone (which is common sense). Feedback is when a mic picks somthing up-it goes to the speakers-then goes through the mic again- and keeps going faster and faster becuase it doesn't know what to do with it. So it keeps looping through the speakers and the mic and that is what generates the feedback noise.
 
Raise the volume of the sound card to the max (thus improving the signal/noise ratio).
 
but the thing is, the line noise could be coming from the sound card or the reciever. if you turn the sound card all the way up, then that would mean that the line noise is coming from the reciever. If you are turning the sound card down, that would mean that the sound card has the line noise. A cheap sound card would have more of a chance to have bad line noise comparing it to a nice reciever.

I would try both. Try it with the sound at 50% on your computer, then at 10%, after at 100%. remember, there is more of a chance having the line noise on your sound card vs. receiver.
 
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