Intermittent sound, narrowed it down to the wiring on the subwoofer. When I shake the wiring on back of subwoofer unit sometimes it work and sometimes not, the sound is loud at times. Can you buy pass subwoofer and use the other two speakers or is the subwoofer fixable or due to cost should I just buy a new unit?
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Check its speaker. In subwoofers, the lead wire that goes to the voice coil; goes from the speaker solder terminal to the vocie coil will get internal break and this type of fault sill occur. Intermittent working of speaker will be the result. Lead wire can be replaced. It can be bought from the electronic spare part shops. It is a type of copper braid wire. If you have the skill, fid out which wire is faulty and replace the same. you have to take out the speaker out of the box for repair. Broken wire can be detected by measuring its resistance with a multimeter. OK.
Best bet would be to just strip the wire with a wire stripper or utility knife and twist the bare ends together to fix the connection. A little electrical tape around those wires and you should be almost good as new. Of course you might notice some difference in quality but I'm pretty sure the only way round that would be replacing the cable.
Try it out and let me know how it works out for you. If you know how to solder it might be a good idea to solder the connection as well.