Still further, Dan, all of the outputs in that one section are to be used when an external amp is driving the speaker in question; it sends a low-level signal to those amps, bypassing the 1300's amps. The only use you have for that set of outputs is the single sub out, for the sub, which of course has its own amp. I'd also suggest setting the LFE on the 1300 to sub instead of both. Probably what you've been getting is too "full".

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Enjoy the music, not the equipment.