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[ngtnn]

I got an aftermarket nav double din to replace on my 08 camry(jbl system). I wanted to keep all the factory speaker on there. I have a guy doing it for me; he runs all new wires from the the din to bypass the factory amp and he said if I wanted to keep all the factory speaker, I need to get 4 component crossover since the camry has 8 speaker. Is this the way to do it??? anyone has any diagram I can look at it? I've searched and couldnt find anything. Thanks.