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Does anyone know the location of the stock crossovers in an 03 Civic EX coupe? Thanks.

 
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There is no crossover, there is a bass blocker wired inline with the tweeter. If you take your door panel off, you will see it about 4 inches down the wire from the tweet. It should be wrapped in a peice of foam, and is about an inch long.

 
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If im installing a new set of components, would it matter if I just used the tweeter wiring with the inline bassblocker, or should I replace this wire with aftermarket?

 
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if your buying new components, they should come with a crossover that will seperate the signals and route them to the right component

 
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Yes, I have a set of Infinity Reference 6000cs componenets with crossovers. I just wanted to know if I should cut out the bassblocker or just leave it there when I wire the crossovers to the tweeters, because I am going to use the stock wiring already in the door.

 
Rep Power: 328

When you unplug the tweeter, the bassblocker comes out with it. It's attached to the tweet, not the wires in the door. You should be all set.

 
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Cool, thanks. Is the wiring in the door pretty straightforward, i.e. the colors/polarities match up with what the manual says?

 
Rep Power: 328

There is a wiring/color diagram in the DIY section on this site. Generally light colors are + and dark colors are -.