Ok, turns out this problem has been going on for almost 6 months! **bleep**?!
The problem originated with the 4100 series. We were using the receiver to verify the audio output of the boxes, which is always Dolby 5.1 regardless of original source. Look back at some of my posts and you'll see documented proof of the original signal, and the processing being applied by the 4100. Not only is the box converting everything to 5.1, but Dolby Audio compression is being applied regardless of your settings in the menu. The compression settings only apply to the analog audio outside, not the optical or HDMI outs. Like I said, please contact Verizon support directly.
The following thread mentions some picture quality issues with the older VMS-1100, which my testing has confirmed. It seems one currently has to pick between surround sound and best picture quality.
If picture quality is more important to you than having surround sound, then think twice before downgrading to the VMS-1100 from the VMS-4100.
Verizon, can you PLEASE, PLEASE fix the surround sound issue with the VMS-4100 soon? (so it doesn't drop the center channel, and maybe more troubles) Many of us want to hear *and* see our FiOS TV content in the high quality that we expected.
As this conversation pertains to audio issues with Fios TV One, please stay on topic. Other issues with Fios TV One are discussed elsewhere. Thank you.
How can this still be an issue Verizon?! This has been going on for well over a year already. LETS GO ALREADY!
Hmmm. I am not experiencing that even after getting in to the white screen user settings and changing to "pass through". Did you do anything else? What setting are you using in the regular black menu settings for audio out (Stereo or Surround)?
EDIT: Just re-read that you went back to 1100. Disregard. Thanks.
I know this is an old thread but had the same issue and there is a hidden menu to set the box to L-PCM or passthrough that tech support walked me through. It fixed the issue for me and now 5.1 and 7.1 work. And the issue of stereo on main channels is gone.
"with the STB on hit power-ok-ok-then left arrow at this screen--- this will open a diagnostics menu you can back out of one level and then youwill see user settings-press ok and will find lpcm under addl hdmi audio output
That doesn't solve the problem with the audio, as now you receive L-PCM on every channel, not 5.1 Dolby or even 7.1 as you claim. I talked about doing this in the 1st post when I created the thread which btw, you can get to the same menu quicker by just holding down the green button on your remote for 5 seconds, so Fios support is really on the ball! I received a message from Fios saying that they are working on correcting the issue and are going to have audio passthrough available in the future, but I wouldn't hold my breath.