The Nautilus HTM2 is voiced differently from the matrix range. I tried one a while back with my 802s3 Matrix speakers and it was definitely noticeable in its difference.
The standard Matrix HTM was better at integrating even though it didnt handle the power and dynamics as well as the HTM2. It was a better match and I happily lived with it and its restrictions for a couple of years before upgrading my whole speaker package.
I actually have one in mint condition for sale if you are interested. (Mods please delete this if FS comments are not allowed).