Yes, calibration set my bookshelf speakers to large and set my sub very high, so sometimes you may need to run it more than once or make a few minor adjustments after it is done. Also, it may EQ the mains in such a way that they sound different to you than before. You can try some music in DIRECT(no EQ) and see if there is a noticeable difference in sound, then it is possible it is something YPAO did.