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User Manual of Product 1: Axxess Interface AFDI-5V Ford 12V to 5V Step Down,BLACK...
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“pop” is that the OEM amplifiers do not require 12 volts to turn on but 5 volts. Axxess has developed the AFDI-5V to take a normal 12 volt turn on from the aftermarket radio Axxess has developed the AFDI-5V to take a normal 12 volt turn on from the aftermarket radio and drop it down to 5 volts, which the OEM amplifier handles better.
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