I just recently purchased a pair of Martin Logans (Aeon i) and have enjoyed them tremendously until I tried to add a sub into the mix. Currently I am just doing a two channel setup using a Rega Apollo cd player, Rega Cursa 3 preamp, and Adcom gfa 5802 amp. My preamp has two sets of preouts and I used the second pair to run into my PW 2200 Paradigm sub. Until I added the sub the soundstage was nice and open, but as soon as I hooked up the Paradigm it immediately sounded thin and reduced. Why is this? I went back and forth between sub and no sub and my wife and I noticed a huge difference. I have the crossover set on the Paradigm at 80hz and only have the volume up to about a quarter of the way. I would like to add this sub for a little more bass but not at the expense of an open soundstage. How in the world could adding a powered sub affect the soundstaging coming out of my Martin's? Thanks for any help or comments.