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Of course, you could have a ground loop, but that would not really explain hissing. In my system I have no noticeable hiss because the amplifiers and CD player are decently quiet and my speakers are inefficient. But there is a little buzzing that goes away when one of the amplifiers is unplugged. It's caused by connecting the signal grounds to earth; small differences in earth potential (because of the house wiring) cause hum to appear in the signal. Only thing is, it's the same strength regardless of volume.
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