Weird sound in Noise Canceling mode; AirPod Pro

I have the same issue with my pro original.

It’s my left ear that has these crackle. Sounds whenever I turn on transparency mode or noise cancellation.

It goes away as soon as I switch any of them off.

Any news on how to fix this?

Hello Masoud-rvn,

Thank you for reaching out in Apple Support Communities. There are steps available that may help resolve the issue you're experiencing with the sound quality for the right side of the AirPods Pro. We recommend for you to follow these steps:

If Active Noise Cancellation isn't working as expected on your AirPods Pro

Follow these steps.

1. Make sure that you have the latest software on your connected iPhone, iPad, iPod touch, or Mac.

2. Put both AirPods Pro in your ears and check that Active Noise Cancellation (ANC) is turned on.

3. Clean the mesh located on the top of your AirPods Pro. Sometimes Active Noise Cancellation can be affected if debris or earwax builds up in the area shown below.

If this happens, you might experience: 

* A loss of bass sound

* An increase in background sounds, such as street or airplane noise

4. If Active Noise Cancellation still isn't working as expected on your AirPods Pro (1st generation), refer to AirPods Pro Service Program for Sound Issues.

Following these steps may help resolve your issue and is outlined in this article: If Active Noise Cancellation isn't working as expected on your AirPods Pro - Apple Support

Kind regards.