Quote:
Originally posted by 4Runner_Fan
Adding an aftermarket sub can be a little more tricky that just adding one of those self-powered ones. Do not tap into the speaker wire at the back of the car as it has already been "crossed over" to a certain frequency that is matched to the specific JBL sub that comes stock. Rather, it is necessary to tap into the sub wire at the front of the car before it reaches the crossover or the amplifier. This poblem exists in my 01 TL in the Bose systems. People tap into this wire in the trunk and cannot figure out why it sounds so bad. Good luck.
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That will not work on the JBL system. The line from the back of the head unit is not a regular speaker signal, but a bus data signal that sends all the signals for each speaker through one set of wires.
