Computer Power Supply Unit Connecting My Car Amp To A Computer Power Supply Unit, What Amp?

Connecting my car amp to a computer power supply unit, what amp? - computer power supply unit

I have a 22A 12V power supply in the rail. My car amplifier 500W max 30A and evaluated. What I want, the number of PSUs amplifier to larger or smaller number of amplifiers that my car? Can the power supply I have now, or do I need more power?