Brian,

For your test #2, were you using a 2-channel analog/digital input, or were you using two of the 6.1 inputs?

On my 1066, if I route a 2-channel analog signal to the front L/R jacks of the 6.1 inputs and put the 1066 in "Ext In" mode, I do get bass from the subwoofer. Rotel has confirmed that the 1066 has the bass-doubling "issue" with the 6.1 inputs, according to info that another HTF member received from their support staff.