I have only had my 2001 sierra for a few months it had cheap pioneer head unit and spkrs they all sucked, drivers spkr was blown and the headunit cut out, so I bought a Kenwood headunit it's ok but I can't see the face due to glare, and yesterday I fainally chnged the 6.5's and 4x6's I bought the JL audio C2-400x 4" and the C2-650 components, I installed them last night it was a little involved due to mounting the crossovers and the tweaters, but it was well worth it! Sounds awesome I would definately recommend them, good bass for not caring about subs anymore!

 

Awesome! The new JL "C" series lines are great! I haven't heard the C2's yet but I know im looking at the C5 3ways they have been talking about releasing for the last 2 years.

 

I like them so much that I am going too install a set in our new Traverse!