Home Theater Questions? Ask a Technician for Answers ASAP
Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
Scott, how are you getting your tv channels, and how are the denons connected to the channel source?
Just to be clear, it is a denon avr-x4200, correct?
The first settings to check on the dtv box is the audio output format to make sure it is on dolby/digital/auto (and not on pcm/stereo).
This could be a hdcp or hdmi communication issue as well, though it is odd tha tit is limited to 1 station.
As a test I'd suggest trying an optical cable rather than (in addition to) hdmi, and see if you get any different results with the optical audio feed.
From there we may have a few other adjustments to try.
I realize you may not be able to test until tomorrow, take your time and get back to me at your convenience.
Being isolated to a single channel it really only makes sense that it may be a broadcast issue. Is it possible the bedroom wasn't actually working when you thought and you just didn't notice? Or that you had it on a simulated surround mode so it appeared to be full channel even if it wasn't? Have you updated the denon firmware?
Each bit of content has its own underlying audio encoding, some things will be surround, some won't. Older tv shows and movies, some commercials, and many local broadcasts/news will not be surround because they often have older equipment. If the issue is strictly local nbc, then it would indicate that your local affiliate is not broadcasting that in surround, or the format they are uploading to dish to bounce back to you is not in surround. It may be worth a call to the local station just to ask them how they broadcast, noting though that you get signal through satellite, so whatever they broadcast locally over the air may still not be what dtv is picking up and retransmitting.
on the left side of the display it should show the input signal type (hdmi/digital, analog, etc) and on the right it will show the speakers being used and the output format (stereo, dolby, etc)
All 5 speakers show because it is in a listening mode that would supply signal to all if content is available.
The signal is still digital, whether it is full surround or just stereo. This can really only be a source content issue stemming from the local nbc broadcast.
Do you mean you did the microprocessor reset?
That is a possibility, but if it is consistently only with a particular channel at a particular time, that still indicates more of a content/source issue than a denon software issue.
The difference there is that it is likely just routing the the left/right channels combined to the center,
it does that on 5.1 2, but if there is no other content besides the stereo signal, there is nothing to go to the back.
You can always use the "all channel stereo" listening mode though, it just takes the stereo signal and spreads it around to all the speakers. News shows for example aren't ever really in true surround anyway, even if broadcast in that format, it isn't recorded with multiple channels of surround audio, it is just the dialogue.
You have to go into the digital input assignment section of the menu and tell the receiver which optical port you are using, it is not automatic.
Denon won't do anything remotely, but I can report it as a potential bug to some denon/marantz engineering contacts I have there and it may be something they can address in a future firmware update.
I realize you're probably watching recorded content and not live mostly, but you might try running an antenna directly on your tv and run optical (or hdmi arc) back to the denon to see if you get a different audio format out of the live broadcast direct from the local affiliate. Even if you are it still doesn't mean that what they upload to dtv is not different but it would be a clue that it isn't the denon at least.
I certainly understand your frustration, and it is possible it is a denon issue, though that isn't 100% at this point in my mind, but it would not hurt to call and ask though I doubt they'll take any responsibility for it.