Originally Posted by Bob Pariseau
^ The HDMI Jitter discussion is a total Red Herring. If changing between 1080p and 720P resolution results in an audible change on the Analog outputs when the HDMI cabling is not even CONNECTED then there is, of course, no TDMS being generated. No HDMI output. And thus no possibility of HDMI Jitter. Besides, Jitter is an issue at the RECEIVING end -- not at the TRANSMITTING end.
If confirmed -- and we are far from that point -- any such result on the Analog outputs would represent a bug.
If there's a bug affecting the digital audio fed to the DACs for the Analog outputs, then of course that has to be fixed before you even consider what's happening on HDMI. I.e., it's the same, LPCM, digital audio stream that's being sent to the HDMI. If it is broken, then it would be broken for all outputs.
Any theory for how this might happen on the Analog outputs would have to account for the fact that it doesn't show up in bench testing of those outputs. Any internal testing OPPO has done aside, there are detailed bench test results of the Analog outputs posted in published reviews of the 105. It's of course possible those bench tests weren't testing the right thing, but any theory of what's going on here would have to account for the fact that no problem has been found on the Analog outputs, with 1080p set, in the tests that WERE done.
What specific testing has Oppo done concerning this issue?
I don't think there is a test that will show anything concerning the analog outputs other than listening. And the change is one that I agree not everyone will hear. I think everyone can hear it, but it does depend on the testing method and what one is listening for.
It would be very easy for someone to switch back in forth and not hear anything depending on what they are listening for, or their mood, or test method. I have no doubt that anyone could hear it on my system, but for some it might first take me pointing out the differences and then they would be able to reliably to tell the difference in any blind test.
Does Oppo dispute that 720P has less inherent jitter than 1080P? This certainly is my explanation of why 720P sounds better over HDMI than 1080P. This should be easily measurable and the engineering theory provided behind it provided by Charles Hansen makes sense.
It seems the Red Herring is saying that the analog outputs could not be changed by this and not disputing what can be measured (jitter) and explained theoretically through the math concerning the HDMI output. After this is established (HDMI jitter for 720P vs 1080P), then the translation of this effect to the analog outputs can be discussed.
I had tested every single setup menu item for its effect on sound except for 3D HDMI blanking. I tested this the last few days and the sound is better with HDMI 2 set to blank. I heard this difference over the coax out with HDMI 1 connected to the display. These being the only connections to the player and this was with no 3D disc playing.
Perhaps I could post my config file for people to try out? I imagine most would find an improvement in sound with it as all these things add up. Some items might have to be changed, but I have no doubt my config file is fully optimized for sound.