It's weird. We've sold dozens of JX's at our dealership and I don't think we've had a single one with this issue. Maybe our clients are all deaf?
Aimshaw, if it is that much of a problem, I'd make a mature, non-accusatory plea to management at your dealership. Explain how much you like the car and everything else seems great, but this problem has really soured your overall experience as an Infiniti owner. If they can't make it right, take your concerns up the chain to Infiniti corporate. Let Infiniti prove to you how much they truly value an excellent overall customer experience. Hopefully either your dealer or Infiniti will come through for you. I've seen them go to pretty extraordinary lengths to ensure customers are happy.