so yesterday i went get a new battery for my engine (optima yellow top) and i notice after it got installed my system wasn't as loud anymore!! i checked the wires and all and everything looks great but my system (fi btl n2 15)(AQ2200)isn't loud anymore..i didn't have this problem before i replaced my battery.. i would think it would be even louder replacing my old stock battery with this new optima battery.. anyone have an idea what this problem could be..or has had this problem before..thanks !