I have two SVS 20-39 subs about 5 feet away from my mitsubishi 55 tv. It has 64 point calibration. I noticed on two occasions both a couple of weeks after I had calibrated that my convergence was off. I redid it and it happened again.. I was wondering if anybody else has encountered this ? also my dvd player which is on a rack about 3 feet away skips occasionaly, maybe from sub vibrations, I am also worried that the subs might be negatively shortening the life of some of my components.