Originally Posted by gfgrimmjr
Registered to post this thread, but have been reading these forums for many years. [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]
AVR-X6400H, owned since April 2018. No issues until 8/9/2018. I believe that my unit auto updated FW as I have 6451-0361-0191-6164 now (AirPlay2 update).
Input Stream: 48kHz 2CH PCM (Apple TV 4K & Xbox One X) (does not repro with 8CH PCM or Dolby TrueHD in my case)
Output Sound Mode: Dolby Surround (this is the only mode that repros for me)
Speaker Configuration: Dolby Recommended 7.1.4 w/ 4 ceiling speakers
EQ: Audyssey XT32 Reference
If the behavior is not present at power-on, toggling through sound modes and back to Dolby Surround almost always results in most of my speakers not outputting sound and the ones that still do feature large amounts of distortion in the audio output. My workaround is to use the DTS Neural:X for 2CH PCM up-mixing (think Amazon Video on Apple TV4K as the use case).
Can anyone else with the latest FW update repro this behavior?
I noticed this problem tonight on my 6300. Someone else posted about it in the 2016 Denon thread as well. I downloaded the old firmware from Denon's website and installed it via USB and the problem went away. (I came here to see if it was affecting other models.)
Denon AVR-X6300H, LG OLED55B7A, Sony UPB-X1100ES, Oppo BDP-103, Tivo Roamio OTA, Panasonic DMR-ES46V, Proscan PSLD-43, Audio-Technica AT-LP120-USB
Klipsch R-820f fronts, C-2 center, R-620 surrounds and F-2 back, Quintet V for Atmos, Monoprice Monolith 10", Velodyne VRP-10