IMP I dont see any reason to use a computer power supply. If you want to try go ahead just be prepared for some smoke (no mirrors).
Computer SMPS are designed for loads expected inside a computer not that of a power amp. You have seen the specs yourself and realsied this (-12V at 0.5A). However if you insist of building a home system using a car amp you can build a SMPS for the same. There are many circuits on the internet for this. I am a big fan of DIY but there are other forums for this discussion.
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