The same exact thing happened to my XTI 1000 that I bought. It was shipped to me, I put it in my rack, I set the gain structure....only used Channel 1 output to check the sound. Set up at a show and had to work off one 4" horn for my highs. Tried every possible way to see if it was user error, I have a bad Channel 2 output. Had to drop it off at a local Crown Service Center. Its under warranty, thats what its for, let them figure it out. All of my other XTi's have been great.