that's normal. AppleTV decodes and send dolby digital+ audio as multichannel PCM (received by your AVR as multi-in).
dolby surround is your AVR upmixer. when it receives non-surround formats (I.e stereo). you can enable/disable this on you AVR
that's normal.
AppleTV decodes and send dolby digital+ audio as multichannel PCM (received by your AVR as multi-in).
dolby surround is your AVR upmixer. when it receives non-surround formats (I.e stereo). you can enable/disable this on you AVR