ok so i have this sub and it doesn't work and now i'm trying to figure out if it is a sub that is worth getting fixed. it's a KLH sw-12. has a freq response of 26-20,000 hz. i really don't know what that means so i dont know if it's good or not. amp power is 100 watts. has auto on. phase rev/norm switch. low level left/tr switch. high level in/outs. i suppose much of that is standard on good subs. i just don't know. so what happens is that when the sub comes on all i get is a very loud hum or buzzing type sound. i opened her up and everthing seems to be connected so i dont know whats wrong. could it be the transformer? so should i get this sub fixed or get a new one. my budget on a new one would be about $500. and what new one should i get for that much money? thanks for the help. edited to corrwect the 100 watts power. also the 26-20,000 hz is exactly as it's printed on the back of the sub.