Well I know with my old Pioneer unit I needed line boosters with the stock Bose amp & speakers. Are you having to turn it up VERY loud just to hear anything? For example on my pioneer the volume went to 60 and I used to run it on 56 without line boosters
unfortunately the Bose (not even sure they are Bose) amp & speakers are pretty poor, you need to change the HU for functions and looks but if you want SQ you will have to change the speakers and amp. I keep getting shouted down for saying that on here but it is a fact, anyone who says differently obviously has their ears attached to their ar$e
Glad to be of help Chris