How many here have suggested listening to your new speakers first?
Excellent advice, but after listening to the MA12000 driving the Sabrina X, I decided that I did not want to alter what seemed to me to be an extraordinary speaker. They also had all but the last octave of base, so I looked for a fast subwoofer that was known for their high level inputs. Available funds made the S/812 my compromise choice. Moving into the reference series increased cost and limited availability. I'm now curious to listen to the difference with the subs on vs off.