Yes, I kept using 2 ASW-800 (Matrix) subs that I had with my 801 S3/North Creek speakers. They mate well and are great for the right left channl for DVD but for metal/rock I wouldn't listen without them. I have never thought of eliminating them and I don't think there is much gain in the newer Nautilus subs vs. the loudspeaker line. I even added one to the HTM1 for center channel full range bass. My system was built for 2 channel music but evolved into theater system for family viewing which has been great.
