Hi guys, having an issue with my audio in my 2006 wrx. I have sound deadened my 4 doors and boot(trunk). Installed jbl gto splits front (6.5") and rear (5.25"), powered by a 1000w pioneer amp(have correctly set gain). I also have a 10" kicker sub on its own amp. The headunit is a grundig. Now the issue I have is, when driving I loose a considerable amount of bass. If I lean forward and down to where my steering wheel is whilst driving I can hear the same bass heard whilst stationary. What am I missing here? Why can't I hear my bass in the correct seating position.