Bayne, as T discovered when the special stereo setting for the sub on his 3808 was changed from "no" to "yes", it's always possible to use the sub with 2-channel material. If the mains are set "small" and the sub "yes" of course, it gets bass below the selected crossover when set "LFE" only. The "+Main" setting isn't necessary or generally advisable.

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Enjoy the music, not the equipment.