Sounds like rattlesnakes!

I’m having this problem playing back .AVI files… Thay sound great on my computer but through ATV sounds like rattlesnakes comming from my speakers. This happens on most but not all files.

Thanks in advance.

Is your AppleTV connected to a Dolby compatible receiver?

Try disabling the ‘AC3 Passthrough’ option found in the Maitenance > Settings menu to see if things improve.

I think it was the AC3 thing… Thanks