Hello everyone, I am a returning member of this forum, I have been visiting here since '99 or 2000. I was one of the unfortunate owners of a Pioneer VSX-26TX receiver with the dreaded "no sound" problem. It was repaired in August of 2000 (solder connections simply resoldered)and everything was fine until the same failure occurred a couple of months ago. In talking with the repair tech, I discovered that Pioneer issued a service bulletin last year describing a retrofit kit to resolve the problem. My problem was that, as of this Saturday, the unit is two years out of warranty. I called Pioneer Customer Service and after complaining that this was a well documented manufacturing defect, I felt they should still be held responsible for it. They issued a letter authorizing only the evaluation of the unit by a repair center. I dropped the unit off a week ago Monday. This past Monday, I received a call from Pioneer saying that they will authorize a one-time repair of this unit or they will allow me to upgrade to a current model at a discounted price. Well, after giving them several models I would be interested in, they called back with pricing and it was a no-brainer. After waffling back and forth on a VSX-45TX vs a VSX-53TX, I should be receiving my new VSX-53TX with a 2-year warranty in three weeks or less. I have read all I could find regarding the MCACC feature and that is where my question lies. My speakers are a Polk RM6500 system and per Polk's recommendation, I did not use the LFE output from my VSX-26TX receiver, instead running the front speaker outputs to my sub, then from the sub to the front speakers. I guess that was ok, as I never tried hooking the sub up directly to the LFE output. If I connect my speaker system to the VSX53 the same as I did on the VSX26, any ideas on how that will affect the MCACC calibration process? If I use the LFE output, how would I connect it to my sub? The output from the receiver is single channel while the input to the sub is two channel. Any thoughts and advice will be greatly appreciated.