The reason (probably) it sounds distorted is caused by the voltage output of your head unit. I believe Fords is a 1v and most higher end aftermarket ones boast a 4v all the way up to 8v and this is causing your amp to recieve a clipped signal. With my alpine cda-9835 you can use your own settings or use fords factory settings from the amps and thats what I leave mine on otherwise I get the same problem. You could get an inline driver and turn your voltage down pretty low. I havent really looked at the amps to see if you could turn the gains down manually.
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