'07 Non-nav, brand new.

Noticing that the right speaker, woofer probably, buzzes occasionally with bassier tones -- in fact, I notice it most often when human speech is playing through it. This is at normal volume. Wondering if anyone else has noticed this, or if it calls for a warranty run.

P.S. Have there been threads on the Eco Drive meter? I searched around but couldn't find much. What exactly is this thing telling me?