I have a Kenwood KDC-215S CD player in my car. When I listen to the radio on it, flat settings sound great (bass:0 treble:0). For some reason though, when I switch to CD mode, the flat settings sound terrible. It sounds very bright, and the vocals often sound piercing. There is also nowhere near enough bass. First of all, any idea why this might be? It doesn't make sense to me that it sound fine flat on radio mode, but not on CD mode. Secondly, what would you suggest I do to fix it?

To specify, I know how to adjust bass and treble. My question was more on the theory side. What should I listen for when adjusting each settings (bass, treble)? I especially have trouble working with the treble. What is a good thing to reference when adjusting it? Lastly, I was wondering if it's better to boost levels or reduce? For example, if there is more treble than bass, would it be better to boost the bass or reduce the treble? Thank you in advance.

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