We actually botched the very first step of the auto calibration--plugging in the included microphone. We thought it was plugged in, but since the plug wasn't fully inserted, the auto setup aborted after running test tones through all the speakers and subwoofer. The onscreen display indicated "Error Code 33" had occurred, but didn't offer any advice about how to correct the error. Turned out the problem was we hadn't fully inserted the mic plug into the jack. It's a bit of a tight fit.