Incorrect. If you engage the 80 Hz analog crossover, everything works as it should.

And as far as the "6 ch bypass", you are correct, but it is a known bug. You have to be in a 5.1 DSP mode before you switch to 6 ch bypass to get all 5.1 channels (DD/DTS/5 ch stereo, for examples).

Same bug also effects the test tone generator. Have to be in a 5.1 (or 6.1 or 7.1) DSP mode, or else you only get 2 channels out of it.