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Steve, I've done this before, but I used a power inverter from Radio Shack. If you're using a PSU, I can't imagine it'd be much different. I wouldn't recommend using home stereo speakers with a car amp unless you know what you're doing. If you've got a car sub, this is a pretty good way to make a cheap powered subwoofer.
If you wanted to do this so it looks nice and nifty, get yourself a female molex connector to fit the male connector coming off the psu. (radio shack, computer stores, etc. should have one. )
Take the two power lines (one is supposed to be connected to a constant "hot" wire and the other is basically set up on the accessory circuit in the car. Don't worry about this since you're probably just going to use the switch on the back of the psu anyway. If not, wire a switch into the "accessory" wire.) and connect them in with a 12 volt wire from the power supply. Take the "ground" wire from the amp and connect it to the black wire that should be connected to the same molex connector from the power supply. Any one will work, but it'll look a lot cleaner this way.
Now, you have the amp powered. Turn it on to make sure it actually turns on. Then unplug it, attatch your input and speakers and you should be in business.
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