Left and right audio is cancelling out when I stream from macbook to apple TV2

When I stream from iTunes on my Macbook to my Apple TV the left and right audio sounds like it is cancelling each other out, meaning the lead vocal on songs is very low in the mix.  Anyone know why this is happening?

Well there is something definitely wrong. If track is panned to left channel and the output virtual LEDs show left channel only then it has to be a problem somewhere else. Are you using a digital interface or the 1/8" audio out to mixer, headphone.

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