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Noise cancellation is not working | SoundComm™ B40 headset
See if the light is lit on the headset control module.
The LED light on the control module should light when powered on. Flip the power switch at the top of the control module away from the LED (the on position) and see if the light is lit. For more info, see Understanding LED indicator status lights and information.
Check if the headset works while connected but powered off.
If the headset works without power, the connections are correct and the headset electronics are the issue.
Be sure the headset is being worn properly.
Due to the angle of the earcups, proper left and right earcup placement is essential for the headset to fit around both ears. The headset's performance can be greatly reduced if the earcup fitment around the ears is poor. For more information, see Wearing and adjusting your product.
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.
Replace the batteries.
Remove the batteries from you product, then insert new batteries. Check that the + and – markings on the batteries match the markings in the battery compartment. (Note: Rechargeable batteries are not recommended. Use alkaline batteries when possible.)
Install new double-A alkaline batteries.
Remove the batteries from you product, then insert new batteries. Check that the + and – markings on the batteries match the markings in the battery compartment. (Note: Rechargeable batteries are not recommended. Use alkaline batteries when possible.)
Check if the noise level surround the headset is too loud.
If the ambient noise level outside of your headset is louder than what the headset is designed to handle, noise reduction and audio can be affected. If outside noise reaches 112 dB, noise cancellation from you headset will be reduced but audio in your headset will still be clear. As noise levels become higher than 112 dB, noise cancellation will lessen. At 136 dB, audio can become distorted and unintelligible.
Replace worn ear cushions.
The issue may be caused by the lack of a proper seal by the ear cushions around the ear. Also check to be sure the cushions are securely attached to the earcup. Replacing worn ear cushions will aid in comfort, the performance of the active noise reduction and battery life
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