*Falls out of chair, clutching belly, laughing so hard, he can't breathe!*
I can't BELIEVE all the misinformation in this thread! And I'm surprised at Viperoni...I thought he'd know better/more than this! :Q
There is no way in hell you will get a car audio amplifier to run, steadily, off a PC power supply. The amperage draw is far too high. I mean, "YES", it will turn on, but the moment you crank the volume, you'll blow the PS that the amp is powered by.
Look at the gauge of the wires coming out of the PC PS. Those are 18-gauge wires...tops. Ever notice how the minimum gauge wire that car audio amps are hooked up w/is 8-gauge? There's a reason for that. It's called "amperage draw."
I happen to own a 25-amp, 10-15 volt (variable) powersupply. It's made by Pyramid and it weighs about 20 pounds (the weight should tell you something)
I've hooked up a 300-watt RMS caraudio amp to this PS and at 3/4 full gain it draws approximately 20 amps, as shown by the VU Meter on the front of the PS.
If you want to use a car audio amplifier in your home (I have used one as a Home Theater subwoofer amp) you'll need a REAL 12V ps. Using a PC powersupply will not work, as it's designed for a completely differnet use.