I noticed something strange on yesterday's drive. It was a warm beautiful day and for the first time since I bought the car I was driving with the drivers window down and the sunroof wide open. The sun was shining, the 60+ degree air felt glorious and I had the radio cranked up all the way. This was near the end of my commute and I was in city traffic so I could leave the window/sunroof open and the ICE was turning on and off at the lights.
What I noticed was the bass in the music getting more intense at times. My first assumption was that the audio system was modulating the levels to keep me from blowing out the speakers, but the pattern had absolutely nothing to do with the music itself. I realized after a bit that the bass was more intense whenever the ICE came on. Wanting to make sure it wasn't something in the older MP3 file I was listening to (I was listening to my iPod), I listened to a few different songs from different genres (Rock, Bass heavy techno, classical, and even a country song), and made sure some were older MP3s while others were music purchased from the iTunes store (both the old and newer formats). All the songs, when played at very high volume, had the same effect.... the bass was more intense when the ICE cycled on. It actually sounded better.
I unfortunately didn't try closing the window/sunroof for further testing (I got to work before that thought occurred to me).
Is this somehow the Active Noise Cancellation?
I had never given the ANC any thought before this. I figured it was in the background doing it's job. This is the first car I've owned with ANC.