With my Mirage Bipolar 8" sub and M22Ti its produces best music and movie sound at about 80hz. I tried putting it up and down and compromised either one. And more than halfway point on the level I noticed unwanted low frequencies and my neighbor knocking at the other side of the wall.
But what I noticed was that I set the crossover setting on my Rotel receiver to off rather than 80hz. I then set my sub to 80hz. THe reason for this is that my reciever took a lot of the lower frequencies off the M22Ti. It actually sounded better with the full spectrum of sound going through the M22Ti. The sub layered over sound frequencies from 80Hz to a nice low of 22Hz.
