Originally Posted by Roo

It is not the speaker, if you put your head up under the glove box you can hear it. If you put your ear next to the speaker you hear it from the other ear.

Ours is a noise you cannot miss, anyone who has been in our car ask what that sound is and that its giving them a headache. Also the techs at Nissan heard the sounds and documented that they heard it.

But yes it is the same way, it happens when you raise the RPMs, either while driving or in neutral.