They sell an adapter you can get at AutoZone https://m.autozone.com/stereo-speak...ss-integrate-output-line-converter/208157_0_0 for instance, where you can run your for high inputs into your amplifier... then you'll be able to fade it at the deck no problem. Many amps already have high level inputs.. but then again many dont, like my MBquart 4 chan in my pickup.
