Alpine 9870 - Need help with settings

[GabeC 10+ year member]

I know how to get to the settings and all but i dont know what most of them are and what exactly they do. Yea i know i could just play with them until it sounds the best but if i know what they all do then i can make a better judgement.

I see a couple options, i see HPF (60,80,100,120, or off) or something of that sort. High Pass Filter? What exactly does each level do? Then there's a Bass section where you can change +1 up to like +7 and you can change the frequencies i think, then there's a Treble with the same thing.

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