Mike, Alan is off the board now, but the speaker level connection that he described would be a parallel, not series, connection of the sub and speakers. Regardless of whether the wires to the speakers ran directly from the receiver or for some reason ran from the receiver to the terminals on the sub and then continued on to the speakers, that's still parallel. Of course, as you mentioned, that setup has no bass management and the main speakers would have to run full-range.

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Enjoy the music, not the equipment.