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Update for Web Pro, log in as USER1, left side of main screen click on telephone setting, next screen look for extension to be programmed, go to the far right and click on the wrench/hammer, next screen left side there is a drop down, click on function key assignment, you will see the desi-less box with names on this screen.

Yes R4+Z you can do this via phone but what a pain in the donkey.

There is a one second fix for that. Simply disconnect the speaker wires from the rear of the amp and connect them to 120V with something like a line cord and clip leads. In less than one second any speakers without transformers will be destroyed. Those with transformers will be fine. Might want to warn your customer before you do it to cover their ears.

-Hal

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.

I recall about 45 years ago while working for Executone going to a service call at a car dealership with low volume on the paging system. I asked if anything was done with the system recently. Fortunately a guy in the service dept. admitted he added a speaker from car radio recently so they could hear the system better in their office. You all probably have an idea what I found - an 8 ohm speaker wired directly. It was above an intact ceiling tile with a pillow wrapped around it because it was so loud.

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