I just wanted to remind new SC owners about mic position during calibration. I just returned from a clients home where we did the design, consultation, pre-wire and the client did the rest of the install with an 07 we sold him last fall. The client has Berkline reclining chairs and placed the MIC at ear level with the chairs in the upright position which for him was below the rear back rest height. This is not the correct MIC position for any of the auto calibration software programs including MCACC. I am not sure if this was covered in the fact post but if not here is the correct procedure and the most common mistakes made when running auto cal.
#1 Make sure the Mic is positioned above the seats back rest regardless of ear height and make sure when you run auto cal that nothing including your body is in the proximity between the Mic and speakers being calibrated.
#2 Before you run any auto cal make sure your subwoofer or subwoofers are set at the 0 phase setting, crossover set to by pass or the maximum frequency level and the gain is set to at least +75 db before calibration. You can use the internal test tone generator in the set up menu and an SPL meter to do this before you run the calibration software. This is important because if your sub gain is set too low MCACC may not be able to compensate for the correct SPL level.
#3 If when you begin MCACC you hear distortion during the calibration you most likely have a grounding issue somewhere in your system. This needs to be corrected before you proceed with the calibration. The SC series receivers are very sensitive to grounding issues.
#4 Do not adjust calibrated subwoofer distances to the actual mechanical distance. MCACC set's the distance based on the way the subwoofer low frequency information interacts with your room at the listening position so a distance of say 20 ft when the actual distance is only 12 ft may be correct. Trust the MCACC setting with distance and SPL level settings as it is very accurate.
#5 You can re-set speaker size and crossover settings after MCACC calibration, this will not effect the rest of the calibration parameters. In most rooms regardless of the actual speaker size a setting of small and 80 or 60 Hz will be the correct setting if you have a capable subwoofer.
Please accept my apologies for typos and spelling errors, it's late but I wanted to post this before my skull full of mush forgets.