A friend of mine has an oldish G4 tower which we're putting a new Sonnet processor card in this weekend. He's extremely reluctant to throw more money at the machine in the form of a wireless card/airport but he would like to get an audio signal out from the Mac to the living room stereo which is about 6-7 metres (20-23 feet) away. Is it possible to run a good quality shielded cable over this length for a standard line-level 600 ohm (?) signal and get acceptable results without too much treble roll-off, hum or other interference? Moving the Mac or amplifier closer to each are not options, I'm afraid. Thanks for all words of wisdom.