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That was my first thought when I read this thread, only because I've seen this in the wild as well. If this is what your problem actually is, the impedance meter would have shown that in the first few minutes of troubleshooting. Anyone that does a lot of work with amps and PA systems owes it to themselves to get that meter.

The very second you disconnect that 8 ohm speaker, the load will stabilize and the volume coming out of the other speakers will be enough to wake your neighbors dog.

You can set up a lower level password and allow handset programming to allow the customer to do this from a handset.