Every noise source connected to the powergrid(from the generator to you house) contributes interference to whatever you plug into your wall socket. When running on battery power, these noise sources are eliminated, as well as the RF that an unshielded or improperly constructed cord will pick up(just like an antenna). That's also why power purifiers are so popular with persons able to recognize their benefit. It's more what IS NOT there, than anything that is added. With the noise/hash gone: everything is much more lucid and ambience information, that is otherwise masked, is more fully appreciated. This helps sound stage(depth and width) and imaging(or the picture on your HDTV). Of course- Those that can't hear it, or have systems that can't resolve it, will tell you you're nuts.
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