I bought a Yamaha subwoofer from some dud for $40 and the little red and black things don't workthe subwoofer has built in power and umm I tried plugging in 2 different speakers and they don't work.the hole to put in(red n black) is this screw and I'm guessing you put in the output right? is there anyway to fix this?model no. is YST-SW150
Take the bass driver out of the cabinet, take a flash light and look inside to see if you can see any lose wires, or damage if you do see lose wires solder those wires back where they belong reassemble the unit and try it outif there is something else wrong and there are no lose wires, you may have to replace a resistor or relay or it could be a fusedownload a service manual from the Internet and use that to find the fusecheck all components for damage or leakage.if you find something that looks blotted or is leaking look in the service manual for the proper value buy a replacement part of same value and replace it.but just try replacing the fuse firstfuses come in all sizes and shapes so sometimes you cannot tell where it is just by looking
