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The problem that you seem to have occurring is usual.. That option is for when you go up to the DB meter and you want to turn off the highs amp to prevent blowing your speakers under a burp. I noticed that option on my old KDC-X496 and it was very handy testing out subs without annoying people with my profane rap music lmao. Keep that setting on cause its the internal amp in your head unit not your car.
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