I was listening to a movie (DVD) .
Before the end, sound when off.
I can see the video and I can have sound in PURE DIRECT only.
Stereo, DTS, Dolby, etc. don't work anymore.
I change nothing over the last year....
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The 'best' audio result will always be subjective, but when it comes to digital multichannel content, the engineers probably had it right, so I'd go with Dolby Digital, THX for movies; and experiemnt with all the others for muical content becaasse any given audio recording can yield surprising new details when you turn DSP loose on it.
Do you listen to audio CDs via a CD player or DVD player? Pure audio CD is only 2-channel, so either TV or the DVD player is doing the mix to 5 channels. But you can choose the sound mode via remote - there should be modes like 5ch/7ch stereo, where the same signal is going to all speakers (I you this mode for listening to radio sometimes).
Check the input mode on the reciever so that they are set for dual, rather than just digital or analog. It might be set for analog and your using a digital optical in cable. Also make sure DTS mode is turned off, unless your watching a DVD that is dts enabled.
It sounds to me like an audio enhancement filter is malfunctioning. The pure direct on / off is a sound filter to alter the sound performance of the receiver. There is a rare possibility that there is something wrong with one of your speakers- causing certain circuits in the receiver to malfunction. A way to check for this is to connect only one speaker and an audio source. test each channel first(without pure direct) by connecting the speaker to a channel and then disconnecting it, and connecting it to a different channel repetedly, until you have gone through all of the channels. If you really wanted to pinpoint such an anomaly, then you would need to do it with every speaker through all of the channels to make cetain that this is not the case. But then again this is not very likely.
I would personally just use the mode that seems to work, because something is obviously malfunctioning, or possibly burned out. And repairing it is most likely costly!
I hope that you can get something out of my answer! sorry! Good Luck!
What do you mean by "sound programming"? -- I guess it's the ability to change the sound processing, such as from Stereo to Dolby Digital, or to Dolby Pro Logic or Virtual Surround, etc.? Maybe there's a "Direct" or "Pure" or "Tone Control Defeat" button that was pushed, which often (or always!) bypasses all the sound-processing circuits? Check the front panel and/or your remote for such a button and try that. If it's a DVD player, it may be that the audio connections were accidently pulled or changed. Assuming it's the latter (more likely): Either the digital/analog output setting of the DVD player or the setup of the receiver could have been changed. Next, this is a guess, but most likely, it is the receiver that was tweaked -- in order to listen to some other source (such as the tuner), and it is no longer set up to process the digital signal, but stays in analog mode -- AND there's no analog audio connection from the DVD player (or it was not set-up to output analog to the receiver, since the preferred signal is digital surround). Am I getting warm?
You can try this reset precedure below, but it sounds like you may have a DSP board problem. This is a new model of Denon, it should still be under Denon's warranrty, it has a 2 year warranty. If this does not help, you need to take it in to be serviced. If it is not under warranty, you will not like the cost of the repair. A new DSP board usualy cost about $300 and then you must pay for the labor. It is not cheap. This reset procedure has been know to work some minor miracles, lets hope it works one for you.
1. Switch off the unit.
2. Hold the following STANDARD button and DSP SIMULATION
button, and switch on the unit.
3. Check that the entire display is flashing with an interval of
about 1 second, and release your fingers from the 2 buttons
and the microprocessor will be initialized.
Note:If step 3 does not work, start over from step 1.
All user settings will be lost and this factory setting
will be recovered when this initialization mode.
So make sure to memorize your setting for restoring
after the initialization.
If you get sound on direct mode say from dvd but no sound when you go to dolby make sure you have the right input selected by pressing the digitat input button on the front of the amp,ie if dvd optical out is pluged into amp optical input 1 select this on amp then set audio to prologic2.DVDs through this input will decode to dolby digital/dts.
hope this helps.