I just tried this out on my 1066 and I didn't get the same results. Here's what happened for me, tell me what I did wrong and I'll test it again:
source was the Fleetwood Mac Rumors DVD-A. The bass line right at 3:00 into track 7 'the chain'.
1) Mains set to large, DVD-A in stereo mode - No Sub 2) Mains set to small, DVD-A in stereo mode - no Sub 3) Mains set to small, DVD-A in multi-channel mode - Sub Active
That's exactly what i expected to happen. I don't appear to be getting bass management on the main channels on the 6.1 inputs.
Can someone else confirm this or correct my test case?