I hate to say it but I'm pretty sure unless you have the optional Pioneer system you don't have ANC. The way to tell is if the front door speakers have "Pioneer" emblems on them.ccharlie said:So I guess the bass vibration (distortion) in the rear passenger door speaker does not affect the purpose of the ANC. Just get it replaced under warranty. I am guessing that the oem speakers are junk anyhow. I probably should bite the bullit and upgrade to something better. I did not order this Nox so had no option for an upgraded radio/stereo system.