About supply regulation on these chip amps...
The one I built uses two 12KuF (or maybe 15KuF) caps very close
to the chip itself. Using a scope, I can watch the PS droop.
At the point the amp starts clipping, I'm getting only a small
amount of droop. I could go measure it again if anyone cares.

Adding a ~4A regulator would significantly complicate the design and make the project less attractive.
One thing I noticed that was interesting was that in at least
one of my HT receivers, the PS caps were about the same size I'm
using for a single amp. The accountants got to that desing.

About the previous comment about bigger caps coloring the sound, I
can't imagine how that would work. I can understand how undersized
caps could cause problems, though.

Chris