On 07/10/2013 08:43 AM, N_Cook wrote:
well noire rather than grise
I'm not geting a consistent story from the recording studio where these
2 Marshall MG250DFX came from, with Eminence 2x12 in each. One amp , one
of the headers was partially disconnected for the power and signal to
one TDA7293 PA. Would this be a possible scenario. TDA o/p driven to DC
with loss of one rail and burns out one of the speakers but as music
still coming from the other, not much thought about it at the time,
perhaps reporting smoke/loss of power to someone at the studio. Then
someone with the studio jumpers back-to-back that amp to the speakers of
an exactly similar amp, and blows the mirror-handedness speaker of that
combo.?
First one seriously burnt up including part of the spider, but the
second one barely had time to get warm before the wiring of the VC fused
o/c so not even any scorching on the VC former , but a neat split. The
first blown speaker due to intermittant DC and then the second full on
DC drive?

Maybe you could take donations and buy the studio a DMM? The speakers
have a 1/4" plug on them. What do you mean "jumpers back to back"?
Whenever a Solid State amp starts freaking, disconnect the load first!.

The 7293s are 7 bucks at Digikey.