Sub woofer buzzes all the time, do I have to replace the speaker or can this be repaired?

As mentioned above, a blown 2200 uF capacitor will cause that buzz. This is from my Altec VS4621. The buzz would be in the sub, then shift to the speakers if connected. I didn't examine the buzz all that long because it's loud af, but you can see the right capacitor is blown and open. IMO it's worth repairing, the caps are about 2 dollars per batch (20), plus time. You can watch plenty of videos on it, or bring some dollars to most repair shops.

Any radio shack or best buy will have a new sub woofer cord, should not run you more than $ 15-20

Select Start > (right click) My Computer > Manage
In the Management window select > Device Manager
Next to Sound, Video and Game Controllers click the + sign
A yellow triangle will signify a problem so if one is present, right-click that device and select Properties
You can then choose to update the driver
For more details check Dell Xps 420 Manual.
Dell Xps 420 Manual

Bad news! It sounds like the coil is rubbing inside the magnet of the speaker! There's no cure, when the cone is warped it it knackers it up. Had the same problem some years ago with a Wharfedale speaker. Someone told me you can hit it on the part where the cone joins the magnet -with a hammer!
Anyway it didn't make a bit of difference! And the speaker was chucked.

Your sub woofer is not mean for voice sound...check that you have connected the systen up properly and that you have put the sub woofer into its wn connection..if it is in the right connection the woofer could be blown.also try decrease the midrange hurts on the woofer

it is the problem of ur cable there must be a shorting between the cable try changing ur cable.

If the woofer works fine when plugged into any other port, I would say that you have a connector on the receiver that has a loose connection or possibly a cold solder joint (poor or broken solder joint). RCA jacks can be stressed quite a lot especially if you use cables that have very tight connectors. The female RCA jack gets wiggled or twisted when trying to remove a cable and this causes solder joints to crack. I would have a look at that connector on the receiver..

if the amp is going bad repair or replace, the sub you would probably have to replace, this would be the best fix. but check the amp also.good-luck!

The sub contains the amp for the other speakers. But it sounds like the amp has a seriously damaged section and will probably have to be serviced by Bose.

Replace the lead to the sub.
Thanks Guy9