How should i set my gain? I have a volt meter but i dont have a test cd should i just play my regular music and set gain that way? Also when i tried to do that last night i noticed my voltage jumping all aound should i count it as my highest being the top voltage aka My Jlaudio 500/1 says it should be running 44.7v for a 4 ohm sub. And Why does it say to set it with out and EQ on because i naturaly listen to my music at -6 bass and -6 trebel which is the lowest my head unit will go? Also i was listening to my sub at bass boost +13 What can that do? Any Damage?