I recently moved my rear speakers forward about 3' and added an Auralex Gramma for my LFM-1EX sub. I re-calibrated my speakers with a Radio Shack SPL meter. All worked well except for the center channel with even at -10db came in at a higher level than the other speakers. Not a huge problem, but would prefer a more equal sound level between all the speakers. Thoughts/advice are welcome.