Do you by any chance notice this when using Bluetooth voice dialing on your cell phone? I've had several iPhones and all of them rattle or distort on the iPhone prompts and confirmations through the center speaker of the premium sound system. But I've never noticed it on any other source so I've attributed it to the phone....CFRTim said:Is anyone familiar with how to gain access to the center speaker in a 2011 Nox with premium sound system. I have a bit of a rattle on certain tones, mostly with vocals and tinny sounds