I have the stock nav dsp unit, and I have tried it with the dsp on with different settings, off and I have tried both on and off and changed the treble and bass adjustments, but at low volume the bass is to much, its kinda anoying to me, and my wife hates it, when its cranked up then it sounds like it fits not to much, it fits well, any clue? I never saw an amp that you could not set the gain down to nothing.

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M3