Aaron, there aren't any receivers that actually have two separate sub channels. There's one channel which may send the same source material through two outputs. As was said, in most units the two outputs aren't separately adjustable for different level and distance, although a few of the most expensive ones do have that feature. So yes, unless you get a unit with separate adjustments(which may or may not be needed)a "Y" arrangement is all that's needed.

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Enjoy the music, not the equipment.