Install amp and sub in Mazda 6

[Mattharp73]

I an trying to install a amp and sub in for a friend to the factory head unit I have the loc converter. Just wondering where I hook up the loc do I do it behind the head unit or at the speakers and do I do it to the front or rear speakers. Also no sure if it has the Bose system or not if that matters.

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[C1500martin 10+ year member]

1. what kind of LOC?