I have gl2800 and many microphones phantom power ....i connected them and switch48v without any signals .......
If you have a volt meter check the supply is working correctly
48v dc phantom power should be found between these pins on any xlr mic cable.
pin 1 and pin 2
also between pin1 and pin 3
make sure you have amps turned down before checking/switching 48v phantom power
as if all is up and running it can cause big noise in the speakers.
let me know how it goes
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