https://www.youtube.com/watch?v=OtT_6_KaSDQ
...and the sound engineer I'm working with at GIK (John) also said to get the REL out of the corner. Now I wonder why REL suggests corner placement... because moving it to the rear (near centerline) with the driver facing forward, everything clicked. The sub is gone, the music is full and emotional. I cannot believe the difference this made. The tone controls are now off on the McIntosh. I just finished a four hour listening session, which was unplanned. I went down to turn off the system and was drawn into the music. On deck is the Merging+NADAC, arriving on Sunday. I'm expecting big things. The only thing I'm left wondering is what a second sub could possibly give me when things sound this good with one?
I suppose this ends what was my first post in the hifi realm. Thanks again to everyone for their encouragement and support.