On Fri, 08 Apr 2011 10:17:06 +0100, Gareth Magennis wrote:

Interestingly the customer said that the amp went DC and fried his
speaker - the amp has no relay or DC protection. My little bit or
research so far indicates that dv/dt failure in industrial motor
applications can be down to pulling the power cable off a stalled motor,
zapping the gate/substrate connection in a nanosecond. Might this also
apply to a faulty speaker in this kind of audio amp which burns short
then eventually self disconnects?

I also understand extremely electrically noisy environments can also
induce this failure mode. The customer is daisy chaining this amp with
another one via the FX send, I'm wondering if this has any chance of
being the cause of the failure.

Slaving another amp via the send isn't likely but a failing speaker or
poorly wired/connected load might be the reason.



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