wrote in message
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Plus and minus supplies OK right ?

Negative voltage on the minus input right ?
Not negative voltage on the plus input right ?
Negative voltage on the output right ?

If it was an OP AMP it would be bad.

It IS an OP AMP.

Also, since manufacturers are not in the habit of using split supplies
without DC coupling, the woofer is either open or the fuses would blow or
the IC would probably blow a hole out the case.




I've seen quite a few blown TDA power amp chips, mostly Studio Monitors and
Marshall amps, but I don't think I have ever seen one blow a speaker as a
consequence.

Perhaps a testament to good design.


Gareth.