Glass wolf not always mean no internal fusing supplied. There could be a sort of breaker in amp. Like the jl amp. my 500/1 has a digital breaker in it. Not a fuse but intended for same thing> am i right? Oh and my answer to ads not listing amp ratings is because alot of lower quality amps like sony,lanzar,pyle,legacy, etc they all say like 1500 watts and 2000 watts. Oh course they wont say what fuse they have since most havce like 30 amps fuses. Marketing man. All about the sell. Who in their rite mind will buy a 1000 watt amp with a 20 amp fuse on it. Common sence people. liek i said all about the sell.