Tripath TA2020

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I would look at the problem in terms of the speaker load. If you use 8 ohm speakers, then the peak current per channel is 12/8=1.5. So for two channels you could use a 3 amp power supply. Since the chip uses BTL, bridge tied load, outputs the peak to peak output voltage can reach twice the supply voltage, or 24 volts. But the load doesn't see more that the peak voltage at any moment in time, if the inductive kick of the speaker is neglected.

For filter caps, 4700microF is often used for 8 ohm loads, and if you use a 6amp supply for 4ohm loads, then 10000microF is fairly standard. I tend not to use ones not quite so large myself.
 
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