Terry wrote:

Amplifiers really should be protected against speaker shorts.

I doubt this was a speaker short, but rather a short between the two
"hot" outputs (R&L). So, as Trevor so nicely suggested, it is likely
that the output devices blew, and possibly the drivers as well.

As to speaker shorts, most decent amps have fused speaker outputs, the
problem is whether the end-user is prepared to install the correct
fuses.

Back to my corner.

Peter Wieck
Wyncote, PA