I have both the SMS-1 and the Denon 4806. The 4806's MultEQ auto-calibration system will work best wehen the speakers/system is set up correctly. The SMS-1 has insured that my subs are postioned, phased and overall integrated as best as possible. Plus, the 4806's digital signal path is only used in movies in my system. Hirez surround music is done via external inputs (ie not MultEQ'd) and my stereo signal path goes directly to my tubed preamp. In both cases, the SMS-1 has brought huge value.