How do these work?

I'm accustomed to solid state standard eq that comes with line 6 amps, because that's what i have, but soon to have an amp with active eq.

what makes it different than regular EQ?
Passive can really on cut frequencies, being mostly made up of resistors. Active can boost and cut.
active are also alot more sensitive i find, when you always hear how hard it is to find a good tone with mesa its cause they have a active eq, most amps who have them, when you get them to sound good they sound GOOD but they take a while to eq.