Originally Posted by alexwhittemore
Certainly possible, but it seems unlikely to me. Other things that might have changed: fade/balance and bass/treble settings. Are you sure those are all zeroed out (or otherwise, identical to your E90) for a scientific comparison?
I had the settings the same...bass +1 and treble +4. I was very surprised...I am thinking of selling my JL amp and just adding the sub/amp for now. This is a second hand cpo so maybe the last owner upgraded some things...I may try to get in touch with him.