My HTIB has some smaller satellite speakers. my center speaker has two 3.25 cones with a 1" tweeter and my fronts have just one 4" cone and 1" tweeters in each. my surrounds are full range with 3.25 cones. according to the manual the fronts go down to 60hz, the center goes to 65 hz and the surrounds go to 85hz. I can only adjust one crossover setting in the receiver, nothing for individual speakers, and the book suggests 120hz, but if i go according to my speakers' frequency response i could ??maybe?? lower it some? Ive tried all the settings and i can tell the sub takes over more with higher crossover, but im still lost as to how low these speakers can actually go. I am guessing they will no go down to their lowered frequency and still be clean sounding. Ive heard set the crossover 10 higher than the highest rated speakers in the group (which would be 85hz for the surrounds) I dont know if i should set the crossover to 120z like the book says or try 80 or 90 or 100. I just dont want to leave a big hole in my sound. Do calibration discs have tones at different frequencies than you can just play and actually hear how cleanly the speakers sound at lower frequencies??