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Adjust the mono audio, balance, and phone noise cancellation settings on iPhone
You can adjust mono audio, left-right stereo balance, and phone noise cancellation to suit your needs.
Go to Settings
> Accessibility > Audio/Visual.
Adjust any of the following:
Mono Audio: Turn on to combine the left and right channels to play the same content.
Balance: Drag the Left Right Stereo Balance slider.
Phone Noise Cancellation: Uses air pressure to reduce ambient background noise to help you hear better when you’re holding the receiver to your ear on phone calls in certain noisy environments. Phone noise cancellation is available and on by default on iPhone 12 and earlier, and can be turned off for your comfort.