There is constant static in the left ear when the noise cancelling is turned on. The only way to solve this is to turn the noise cancelling feature off. Is there another solution?

While your headphones are charging press and hold the call button and volume up button and your problem is solved.

The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a significant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the shape of the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs.

If the foam in the ear cushion has weakened/deteriorated to the point that it no longer has it's original shape, (in particular the lower half of the ear cushion), the size and shape of the air chamber inside of the earcup is directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

It is probably time to replace the ear cushions. If so, they are available from Bose for $35/pair.

QuietComfort 3 Acoustic Noise Cancelling Headphones Bose Product Support

They are also available aftermarket at Amazon.com for $16.99/pair
Replacement Earpad ear pad Cushions For Bose QuietComfort 3 QC3 Headphones...

or $5.69/pair.
Bluecell Pair of Replacement Earpad Ear Pad Cushion for Bose Quietcomfort...

Turn the left cup counter-clockwise - tah dah!

Hi.

First test if the problem occurs using different output devices. Also ensure there is no earthing problem with the wall socket. In that case you will get the problem even when playing from speakers.

If the problem depends on the speakers, then it is a bad connection. The headphones are not supposed to be disassembled and must be replaced.

Call Bose to sort out the problem.

Bose Worldwide - Contacts

How do replace batteries

if your speakers are near to some electronic devices you'll get theses static noises try to keep them away from electronic devices which solves it very easily..

Uh, that has nothing to do with the headset--it's due to chat in the Xbox controller. No headset is going to be 100% quiet because they are self-powered.

Here is a manual for these headphones...page 13 is what you are looking for.

To turn on noise cancellation, you should slide the switch to the upper position (hold them the same orientation as they would be on your head).

The speaker in that Ear Cup may be blown. You should consider replacing the set with a newer one.

If you listen to this with that static noise you risk serious injury to your ear.