I just purchased a Yamaha 863 open box and it didn't come with the microphone used for the auto setup. I do however have an SPL meter and calibrated the speakers using the pink noise in the manual calibration. A coworker of mine has the exact same receiver and the microphone. Is it worth borrowing the microphone to see if there are any differences in the auto setup or is one just as good as the other? The answer of course is that they "should" be the same. I guess the question is if different which is typically more reliable?