A few hours for the PSU to charge the caps...?!

It takes a few cycles at most - a matter of milliseconds.

Eric: as you have a multimeter, try checking to see what the output
ripple looks like: put it on AC volts and measure across the 5V output,
it should read almost zero volts. If it doesn't, you have a fault in the
PSU that's causing the output to not be stable.

If that's OK then you may have a faulty ground in your system - my
guess is between the SB3 and the speakers. Try changing the cable
between them and see if that helps.

IIRC the original SB3 power supply isn't earthed either, so lack of an
earth in your new PSU can't be causing the problem. Even so, are you
sure the metal case shouldn't be connected to earth for safety? Or are
all the live parts double insulated?


-- 
AndyC_772
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