GAIN should be set close to what ur pre amp output is on ur H/U or just turn it to where evr u start to hear distortion ....Ur gain should have anything to do with y ur blowing fuses....though check ur wiring, might be hitting some metal somewhere ur insulation on ur wire might have come off sumwhere...I just blew my fuse for my system like 20 mins ago (LOL) didnt wrap the wire right after it came from the fuse an i didnt secure so the wire would move and it hit the body and blew the fuse.....
Also i dont have a spare so i guess no system for a while LOL
woah u just though of this u r using HIgh level inputs.....so i assume u have a stock Headunit....I am realy not sure whut u should set it too...But do the one method i said just turn it up tell ur speakers sound funny...then just drop it a little