Not much adjustment in the head unit, you only have bass and treble, there is no midrange. My Aquatics AV AQ-MP-5BT-H is that way, if you use a MP3 that has adjustments they say to have the equalizer turned off or turned down, on my MP3 I have my equalizer turned way down so it doesn't overdrive the head unit, then I just adjust the bass/treble on the head unit.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.