We installed an A&H GL3800 about four years ago and have been very pleased with the board. About 4 months ago we started having intermittent static noise in the system. At first I thought it was due to an aging amp, but eventually caught it acting up and was able to determine that the noise is evident at the mixer-and apparantly affects every bus or place I can monitor with headphones on the mixer. Nothing has changed with the electrical (though I am going to do some improvements on the grounding in the very near future.) Is there a common failure on these mixers or known issues with power supplies that anyone is aware of?
