Del, I took a look at some of the 2910 manual(ugh)and noted that at p.25 the default setting for speaker size(on the multi-channel analog outputs)is large, so you have to specifically change that to small to get low bass redirected to the sub on those outputs. The bass enhancer setting has nothing to do with this(applies only to the two channel analog output), but at p.35 is described the process for resetting the speaker configuration to small, with sub set yes, of course.

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Enjoy the music, not the equipment.