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I have a Audiophonics HPA-S400ET and a HPA-T400ET in a 5.1 system. When warm if the amplifiers are turned off and then on the HPA-T400ET trips out. If you wait about 60 seconds, the amp starts up fine. They both use a Hypex SMPS1200 power supply. You can hear the relay on the SMPS turn on then...