I got a new set of PSB Image speakers set up for HT (Image 7PT for front, 9C for center, 10S for surrounds) and was balancing them on my Denon 3802 using a SPL meter. Is it normal for there to be a 15db difference in the right and left front speakers? That is what it takes to get the same reading on the SPL. All other speakers are within 2db of the front right, but that front left speaker is really quiet compared to the other 4. Do I have a bad speaker or something?