I swear my right speaker is losing quality with the "deep" notes - I hear a little vibration and it just doesn't sound right. Anyone else? And I listen to rock primarily. :bang:

 

The speaker was driving me nuts after I posted the thread. I went out at lunch and did another test. Ok, so I missed something - I did not realize someone who was in my passenger seat left there cell phone clip in the door insert! Doh!