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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.
If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.
I suggest you go over your receiver set-up instructions. See if you need to set the receiver to acknolwedge the addition of the subwoofer. It should be in your receiver set-up steps. Just as a check, hook up one of your other speakers to the subwoofer lead to see if gets audio signal. I'm guessing the issue is your receiver settings.
I think it wants you to raise the volume high enough on the sub so IT can hear at least 75dB. It can always adjust the sub downward if necessary. Max it out at the sub and let Audyssey deal with the adjustment.
Your crossover frequency selection would be a piont below which you want the sub to activate. It depends on the bass capabilities of your other speakers. You want some overlap so there's no droop in the crossover region where your main speakers roll off.
The sub works but the speakers don't? Do you hook up the speakers to the subwoofer output "loop"? This is a circuit issue when it works and stops working. I have the same issue so I wound up joining the wires that go to the sub and the wires that go to the speaker together and place those connections into the sub. The sub works, the satellite speaker works and the impedance load is no issue for my system. Confused? Simply run your neg/pos wire to the sub and where it connects to the sub, run another cable to the speaker (pos to pos., neg to neg).
The only way to repair it would be to deal with component level repair. Although I have the experience, it is too petty and it works fine the way it is.
This woofer was taken from a KLH Pro-71 Series. These were the top of the KLH line from ~94-99 when it was still a real company and not just a name. The woofer is rated for 5-350 watts at 8 ohms. Source: KLH Pro Series-71 Spec Sheet.
Some specific model numbers might lead us to specific manuals and specific instructions.
Depends on your source and its amplifer complement. Some can drive a subwoofer directly while others just produce a Line Level subwoofer output for use by a separate amp feeding a subwoofer or self-amplified sub. The set-up of the source to produce a subwoofer output is totally dependent on its design. Generally, you have to 1) tell it you have a sub, 2) define how bass will be routed or shared among your various speakers accordingto their bass-handling capacities, 3) using test tones, set the relative ludness and crossover settings so you have a uniform sound field.
To find a manual, maybe run it by the manufacturer