Just to chime in here with a personal experience, you have nothing to worry about. I just got a new pair of Algonquins and one of them had a bad tweeter (ugly static sounds at medium to high volumes). Within literally 30 seconds of me explaining the situation they offered to send me a new tweeter.

Summary: They'll take care of you. \:\) (I know it's still a little disappointing to go through what you are, but you can at least know that you'll definitely be able to get the sound you were expecting after a discussion or two with their support team).

Jason

Epic 80-800: HG Cherry