BMW E46 17cm (6.5”) Front Speaker Installation Into Factory Location Right well here is my guide to installing 17cm component front speakers into the BMW E46 3 Series. Now the factory speakers aren’t up to much but if I was going to upgrade I wanted a better bass response from them which meant I didn’t want to go for 13cm speakers using the Autoleads adaptors as although this would have been nice and simple those extra 4 cm make all the difference Now I didn’t want to cut into the