I have had excellent results with the auto calibration. I am curious though. After running the auto calibration the sub delay is set at 32 feet. Thats ok. What I would like to know is when I manually set the delay to something different and then try to sey it back to 32 feet it only will let you set a maximum of 30 feet. I performed a reset and then tryed again to set the delay to 32 feet manually. I was only able to set a maximum of 30 feet. When I ran the auto calibration 32 feet was achieved. Why does this happen.