I am new to the forum, found it thru an internet search looking for info one improving the sound system. As a former Engineer for Bose I found it very inferior and muddy lacks clarity and no punch poor bass reproduction. So I have started at it by buying Polk Audio DB691's 6 X 9's for the rear deck. Wow when I found out what was there and compared it to the Polk Audio speakers it was no reason why no comparison when I looked at the speakers. I have no installed them yet stay tuned for the results. Next I bought 6.5" front door speakers from JL Audio and they look nice although I have not gotten the door panels off which from what I understand is required. Has anyone done a complete or partial upgrade and tell about the results?