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First off, from my experience, amplifiers waste a LOT of power. A good way to test this is to run the amplifier, then, put your hand on it. All of that HEAT that you feel is wasted power, power that never made it to the speakers.
Now, car amplifiers are designed to run at voltages higher than 12V. You will have less output power at a lower voltage. If you have the paperwork that came with they amp, they may have given the output ratings at 12V.
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How much capacitance does this PSU have? If you do decide to do this I would add at least a .5F capacitor.
Next question, on the side of the PSU does it give you a Current Rating for the +12VDC line? A common fallicy with PSU's is that 450W PSU, well, the +12VDC could only supply 5A which would be 60Watts.. The 3.3V@75A or the like, will make up the majority of the allowable power.
-SF
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