That is a parametric EQ. The first is the center frequency (I had initially thought this may be a crossover freq, brandon knows more about Alpine than I do), the second is the slope.
The wider the slope, the more frequencies will be affected, as brandon said.
Which works best for your music depends on many, many things. I listen to metal and have found for my situation centering around 80 with a fairly narrow slope works well for solid kick drum.
Some things it depends on: size of sub, type of enclosure, crossover freqency. Also depends on the size of the vehicle.
And ya, EQs are of the devil.
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