Okay Jack, by "true B" I assume that you mean as main speakers in another room. One possibility is to return the 3805 and get the 2805 instead. Another is a fairly expensive switch which can handle the full amp power. If you're not using 6th and 7th back surround speakers now, you can assign those unused amp channels to power a second set of main speakers.

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Enjoy the music, not the equipment.