Test for Active Noise Cancellation?

[Edintexas]

How can I test the ANC in my '21 Ram Limited to see if it's actually doing anything? I run soft compound tires but there still seems to be more road noise in the cabin than there should be.

 

[tron67j]

Run your vehicle on a set circuit with it off, then with it on, looking for a path that would have some definite noise such as rough road and highway speed. You should notice a difference.

There was a TSB for 2019 models, but maybe extended for your year(?). Not sure. https://acrobat.adobe.com/id/urn:aaid:sc:VA6C2:ef254bae-a36c-4c18-a8ec-588bd2c26f54