your going to want the switch on the "hi" side, thats just adjusting what frequency and since your running your highs, obv you will want it on the high side. the other 3 adjustments I really just play by ear. the "gain" is going to adjust how loud it is, usually your supposed to match it to how many volts your head unit puts out but most people dont. the other 2 I really just play by ear, put it where it sounds the best for what I listen to.. Kind of expiramental