You're probably hearing this. I have it too on my Nexus and between this issue and the signal issues I'm having (no reception at work where other phones don't have issues), I'm returning it for a Rezound or RAZR (haven't decided yet).
You'll notice it more if you use a car dock with AUX-IN like I do. It's not as bad as my DX2 was, but it's pretty bad. Enough to make me worry about my car speakers.
before you jump off the Nexus and to a lesser phone. What baseband version do you have? I515.09? I had 2 nexus phones with it. I had issues. I got my 3rd phone and its I515.10 not 1 issues. I got great battery and no signal issues.
Has that baseband availabile for download? I have the leaked 4.0.3 radio and its .09.
sent from my rooted nexus