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Noise cancellation is not working | Bose QuietComfort SC Headphones
Make sure you are in "Quiet" mode.
Check your settings in the app to make sure you are in "Quiet" mode not "Aware" mode. In "Aware" mode, external mics on the headset feed outside sounds into the headset and therefore can make other noises or the noise floor seem louder.
See Setting the adjustable Active Noise Cancellation mode.
See Setting the adjustable Active Noise Cancellation mode.
Do you hear static or distorted audio while in noisy environments?
In very loud settings—such as airplane takeoffs, concerts, emergency sirens, or construction zones—your headphones' noise-cancelling microphones can become overwhelmed, which may cause brief crackling or distortion. This can happen even in Quiet or Aware mode.
It’s similar to when someone talks too loudly into a phone—the sound gets distorted until they lower their voice. Your headphones react in the same way to intense external noise.
This is normal and doesn’t damage the product. To reduce it, try moving away from the loud source when possible. For example, on a plane, sitting farther from the engines can help.
Move away from any hard surfaces.
Reflected sound (caused by using the headset close to a hard surface – like a wall) will negatively affect noise cancellation.
Check for and install any available product updates.
On a computer, visit btu.bose.com and follow the instructions to ensure your product has the latest features and enhancements. See Checking the software or firmware version and Updating the software or firmware of your product.
Be sure the earcups are tightly seated against the head.
Glasses, earrings and hats may prevent the headphone cushions from forming a tight seal around the ear. Remove any of these items and retest the noise cancelling feature.
Be sure the cushions are securely attached to the earcup.
If the ear cushion is not affixed to the ear cup properly, the noise reduction or sound quality may be affected. For more information, see Replacing the ear cushions.
Be sure the headphone openings are clean and free of debris.
Check for blockages in the headphone mesh grille and headphone opening. Excessive debris can result in low audio, poor sound quality or missing audio channels.
Reset your product.
Much like rebooting a smartphone, your product might need to be reset on occasion to correct minor issues. For more information, see Resetting your product.
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