Anyway, it is unplug because when I did buy this car, there was an Alpine aftermarket radio not the original one. So I think the previous owner or installer bypass all wiring, unplug the amplifier and plug the radio direct to speakers. I'll be installing the rear speaker kit next week and try it. If it's not good, I will buy an amplifier as I guess, the original one is not compatible to an aftermarket radio?
Thanks guys.
Thierry
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