I forget to mention one thing in my last post. Did you check to see if the 906 set the OM-C2 as large in the speaker settings?
The OM-C2 goes low but not low enough to qualify as a full range speaker. I had it set as large for a little while with my old receiver. It worked fairly well but I noticed it would distort in certain scenes. In the most recent Star Wars movie when Darth Vader rises at the end it would distort real bad. That scene is what made me set the OM-C2 to small which is what is should be set as.
The OM-C2 goes low but not low enough to qualify as a full range speaker. I had it set as large for a little while with my old receiver. It worked fairly well but I noticed it would distort in certain scenes. In the most recent Star Wars movie when Darth Vader rises at the end it would distort real bad. That scene is what made me set the OM-C2 to small which is what is should be set as.