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Theoretically it is possible to connect your alpine headunit to the alpine retrofit,but it has no sense,because if it is 40-50w/channel it's nearly the same power like the amplifiers power.Better search e-bay and buy 2 midrange speakers and 2 tweeters for the front door.Retrofit is for those who want to keep their OEM headunit!
In the other hand the output of your Alpine may be too high,for the retrofit amplifiers imput!
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