um on the fire front i can't remember m8, if u have a multimeter u can do a cont.
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test from head unit n see!!
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or the other heath robinson way,, try the wires both way n whichever way sounds clearest with most bass/mid-bass is usually the right way
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i put my cross overs just behind the metal braket that the door handle fits into, there is enough room honest!!!
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i ran the wires from tweeter basically the same route as standard, then behind the plastic thing to cross over, as for the drivers they come out of the door and along the bottom also behind the plastic to avoid any chance of fouling window mechanism,
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mine are running from the set for now, only till i get my amps in then it's a full re-wire of the audio, i did mine on a freezing december day and it was/is a temp measure, it's tidy n secure enough but, no way a final install!!!!!
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hope this helps m8