As some of you will know I have just installed a Sat Nav system, I am very pleased with the system and the sound quality but my car has always been lacking 'volume' from the rear. My estate has dash tweeters and speakers in both front and rear doors but that is it, no subs or anything else! What would be the best way to improve the sound quality? It looks like there would be room to install speakers in the lower part of the tailgate, what size speakers would I need and would I also need an amplifier? The easiest option would be to add an active subwoofer box to the boot but I would prefer it to be 'built-in'. I had better add that I am not a bass-junkie and I dont want to make my ears bleed . Any ideas and suggestions would be appreciated. Jimmy.