N_Cook wrote:

Michael A. Terrell wrote:

Poor quality control, or a defective manufacturing process.

Its more than that.
In both Mackie cases the main active coils showed absolutely no overheating
let alone burning. In all other odd o/c speakers I've poked my nose in, have
had large sections of charring or completely burnt and broken coil formers.
Not failure in the tail sections because they are usually different / larger
conductors soldered or welded to the main coil. These Mackie tails are
acting as fuses, protecting the voice coil, which is ridiculous.


No, it isn't. Who would manufacture speakers that way for Mackie? If
they did, all of them would fail. They would have to pay extra, and get
no warranty. It sounds like the tinsel wire was the wrong type for the
power level and was likely got through due to poor QC. Poor quality
tinsel wire also suffers from work hardening, and broken strands. When
enough break, the rest burn. Also, if they are a few percent too short,
they get more mechanical abuse, which destroys them. Since you didn't
see them when they were brand new, you have absolutely no idea what
really happened.

I have worked in failure analysis in electronics manufacturing, and I
can tell you that production people can be some of the biggest idiots in
the world. Monday mornings they have hangovers, and Fridays they don't
give a damn what they do, as long as they can leave on time to drink
their paychecks.


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