I know we've done crossover stuff before but I have this queery regarding my own personal setup. I've just changed my 2011 crossover from 80hz to 50hz. After just watching the Matrix I was pretty happy with the integration between mains and sub. My Mission M74i's have a frquency responce down to 44hz (acording to Mission) so this theoretically should make a nice overlap from fronts to sub. However, my M7D's only go down to 75hz; so does this then restrict me to a 80hz crossover point, or is it unlikely that surround channels would be given significantly low frequency's in the mix?