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polks are awsome imo i have them all around my car is a b4c so it didnt come with the far back 4" speakers so i drilled out holes and stuck two polk 4" db's. all their stuff is so clear.
I agree with you 100% I have 6 1/2 in the back and front with tweets and the sound awesome!! Just make sure to compliment them with a decent amp and EQ if you can