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Sound Doctor

Do you mean that the power to the amps starts 15 seconds after power tp the amps?
If so, you should set the delay until after the GLD fully boots up, say 90 seconds or so. That way there is little chance that the GLD boot up will send a signal to the amps as it boots.

I do not have an auto boot up power sequencer in my system, so I wait until the GLD and AR2412 are booted up and communicating before I power up the amps. Never have any pops or squealing.

You are probably getting feedback in the monitors before the end of the GLD boot up can apply the EQ settings to the monitors, etc.