"Jim Lesurf" wrote in message


That isn't really a matter of changing to an actively
regulated PSU. Just one of ensuring the PSU has a low
output impedance and ripple even when the current demand
is high. if the "aural difference was dramatic" then I'd
suspect something was wrong with the unregulated PSU
you'd used.

Agreed.


Unregulated supplies can give the advantage
of providing higher peak transient powers. Given that
music tends to have higher crest factors than test
sinewaves that can be quite useful. However the amp has
to be built to cope.

I've done a number of experiments powering power amps via power supplies
that have current limiting. As long as a reasonable energy storage
reservoir is available, amplifying music does not require a great deal of
average current.