I have tried several subs, but sorry no Martin Logan. I currently have in my 2 channel setup (2) JL F-113's and they are really great subs.
With my home theater set up I am using (2) Outlaw Audio subs and an older M&K. When the home theater pass through is activated, the front speakers and the JL F-113's kick in. That makes a total of 5 subs used with my home theater.
I guess what I'm trying to say is you can not have too much bass (sub power) when watching movies with all the explosions, etc.