"N Cook" wrote in message
...

....

As 2 main bass speakers plus 1 in the cab, as sound died unlikely a
problem
with a speaker but will check the wiring in there as well as the other
likely suspects.

That's probably your culprit... going below
the minimum impedance. What is it rated for,
what are you running it at? SS amps overheat
when run below their rated min imp.
__
Steve
..