Didn't you say you had PLX amps?
The powerlight series of amps from QSC is a quality notch above the PLX and doesn't typically suffer from these issues.
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Thanks for the observation,
I kind of use powerlight to mean qsc's switching amps. In this case was a mixture of plx and CX series, in my opinion identical amps with a few different feature sets but same amp modules. I tried a powerlight PL236 once and couldn't tell any difference between it and the plx 3602.
Conrad