Using linux you can "send" the audio between computers via pulseaudio, don't know how to do this in win.

I can for example send my audio via network from my labtop to my main computer that's hocked up to my home-made amp & speakers, this sounds a million times better then the laptop's speakers.

Other way is to use bluetooth, i use this to play audio from my N900 or laptop or whatever has A2DP playback

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Here is a Picture of one of my creations with the bluetooth from DX, this is not my main amp speaker system, but it is very good, but with 10+ years of making speakers & amps i do know what im doing