I got a new amp and I dont know anyting about the EQ. Its a mid 90s made is USA Peavey TNT115 with a Black Widow (I know, its cool

) but the EQ is 40,100,250,625,1.6k,4k,10k. What does all this mean? And what is a X over frequency, it has a knob to change it from 200hz to 2khz? My bass is active if this helps.