I have the same pair I purchased from a dealer about a year ago. I keep them fully powered on all the time as I read this was the thing to do. I have never had them power down on there own nor do I think you can program them to do so. I am going to check the manual to be sure. When you power them on from the rear panel the switches light up green. Then you move to the front panel where you push the power button---once for stand by and twice for on.
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