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But what if I put a switch between the powersources, so I could switch on only one unit at one time.I could just connect the backup power which keeps my presets and other settings to both. The main power would only be supplied to one unit at one time. It would work something like one of those switches that can be bought for a home tv, when you have a bunch of things hooked up and you choose your source. I would not use that switch obviously. Usint this method, if I wanted to use the tape I could use it without being able to use the cd deck, and if I wanted to use the cd I would not be able to use the tape deck. And when the speakers are only getting power from once source only, would it not be safe?
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