yep.. what veryone sbeen saying.. nee fto get an oscope and tune them amps.... then do every possible combination of this door open thatdoor cracked that window down that glovebox open this pillow under my seat .. etc etc.. you get the point.. lol.. not even talking about inside4 the box rounding this corner and that corner 45ing this and that and combinations.. pain in the *** when you got a 65 pound speaker looking you in the eye... but like the other guy said when i had a box below the window line i had subs fwd and port up.. then turned subs up and port toward rear and scooted it off the back wall a few inches and went from 153.x to 157.3 on the meter... just crazy the simple things sometimes