I am getting my new digital receiver in a few days, and I have been reading that I should use an SPL meter to properly calibrate my speakers. Will calibrating my speakers with an SPL be a huge difference over calibrating with my ears? Is it one of those high tech, audiophile things? Or would a ten-year-old be able to tell the difference? My system is not high end, and I am not what you would call an audiophile. So would it still be worth it to buy the meter?