Well, p.41 of the manual implies that in "direct" the sound stays in the same channels and there's no bass management, so with CDs(where there's no LFE channel, of course)there'd be nothing to go to the sub. In "stereo" however, if mains are set "small" with a crossover(the default, as shown at p.29, is in fact 80Hz, if it wasn't set otherwise manually or by Odyssey), the sub should be getting the low bass below 80Hz or other setting. If the mains are set "large" there'd be no low bass to the sub if it's set LFE only; if "+ mains" was set, then the sub should get the mains bass below the 80Hz default or other frequency set.

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Enjoy the music, not the equipment.