I don't know anything about your Audio Refinement gear specifically, but I looked up some specs on it and I have an idea that may at least a discussion started.
The listed audio inputs are: 5.1 analog (RCA), 3 analog 2-channel (RCA), 3 digital coaxial (RCA), 1 digital optical (TosLink)
The fact that it lists the 5.1 analog inputs seperately from the 2-channel inputs makes me think that they are not all connected equally internally.
I'm going to take a wild guess that you might have the left and right inputs connected via the 2-channel inputs and the subwoofer connected to the 5.1 channel input. I don't know how it works, but I read about people using the tape loop to trick equipment before so it may be connecting the two somehow.
If you have everything connected via the 5.1 channel inputs then I'm not sure unless you're in an audio mode that doesn't allow for a subwoofer. My receiver doesn't do bass management in Direct Mode so I must use another mode for 2 channel audio listening.
The listed audio inputs are: 5.1 analog (RCA), 3 analog 2-channel (RCA), 3 digital coaxial (RCA), 1 digital optical (TosLink)
The fact that it lists the 5.1 analog inputs seperately from the 2-channel inputs makes me think that they are not all connected equally internally.
I'm going to take a wild guess that you might have the left and right inputs connected via the 2-channel inputs and the subwoofer connected to the 5.1 channel input. I don't know how it works, but I read about people using the tape loop to trick equipment before so it may be connecting the two somehow.
If you have everything connected via the 5.1 channel inputs then I'm not sure unless you're in an audio mode that doesn't allow for a subwoofer. My receiver doesn't do bass management in Direct Mode so I must use another mode for 2 channel audio listening.