Power supply/electrical question

[Sultan]

K this isn't exactly a pc question, but it involves some pc hardware. I've got a friend building a new car stereo system, and he was wondering if he can use a 400w PSU to power an alpine stereo, amp and equalizer. We have an amp capacitor to put in the line but I'm afraid despite that it will just be too much and blow out some device. Anyone ever try something like this and have any advice? Or do you know of some cheap alternative? We were thinking about using a spare car battery or a apc backup unit to help avoid surges and things.

[Gryph]

I'd use an APC backup with that. But I don't think it would blow anything up since it only delivers what a component needs.