An amp for the fronts is a very worthwhile upgrade. It's not too difficult to run uprated cable into the doors if you would rather ditch the OEM cables, by drilling a new hole through the door-to-body electrical connection. I'm not convinved that it makes a big difference. The bigger problem, I found, is ridding the door of rattles. I have 6.5" Focals in the 180 mounted on 22mm MDF spacers but they rattle like crazy if the bass isn't reduced right down.
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