whats your sound system like? just a head unit and speakers? I reckon you could power this all from a computer PSU, at most a head unit will draw around 10A-15A.... borderline for most PSU's, but if your careful you should be fine..... maybe get a second one just for the headunit........
failing that get a hefty 12Volt bench supply, I used to test head units on battery chargers (and even my mp3car system) at times.... not the cleanest voltage output, but it worked and was cheap!
if your running amps, subs, etc..... forget about it.... its gonna be drawing a few too many amps to keep the PSU happy......
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Project - GAME OVER :(
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