DAC isn't even connected and as such, disabled permanently because I use a high end 2ch DAC. It has to be something else. It's not every song either. Understood. They were definitely my 6 channel rips as I keep them all in their own folder. I'm aware the Zidoo was down-mixing as well. That was my issue. I unplugged the Zidoo before I left home last night. I'll play some files again today and see if it's still sporatically down-mixing any of them. Thanks for your input.