Originally Posted by Noam Kedem
My setup is -
Cables are these from Amazon: 8K HDMI Cable 10ft, BIFALE HDMI Cable 2.1 Support [email protected]
, Ultra-high Speed 48Gbps, Dynamic HDR, Dolby Vision, eARC Compatible with Apple TV, Nintendo Switch, Roku, Xbox, PS4, [...]
I suspected the Yamaha first (it is set in advanced set up to UHD/4K mode 1 not 2, so that's OK), so I took it out of the loop and connected the Nvidia Shield and the Xbox One directly to the TV using above cables. Trying through Youtube app on both devices, and through Netflix, 4K is displayed ("2160" indicated). When I turn full UHD on for the HDMI input selected on the TV (HDMI 1 - and tried HDMI 2 as well, no luck). Still shows "2160" alright, but says "Normal" and not HDR or Dolby Vision or anything of the sort... and under system information shows HDR: No.
I have the PX75-G1 with a Yamaha RX-V683. The TSR-7850 is roughly the same as the RX-V685 so I would imagine both our AVRs have similar specs and firmware. I know with the latest 2.70 firmware on my RX-V683 it is supposed to pass through 4K @ 60Hz, HDR10, HDR10+, and Dolby Vision and
support eARC for hi-res audio back from the TV (though the Vizio only supports regular ARC at this time.)
Figuring out all the different video formats and options has been difficult, and from my testing it's clear I have more issues when running through the AVR.
I have had the best luck getting the most video and audio format support using the native SmartCast apps:
: 4K, HDR10
: 4K, Dolby Vision, DD+ 5.1 via ARC (no Atmos)
* Amazon Prime Video
: 4K, Dolby Vision, HDR10, HDR10+, DD+ 5.1, DD+ ATMOS via ARC
The built-in Chromecast has been limiting, however. Casting YouTube or Disney+ from my phone seems to max out at 720p with no HDR support. And audio limited to PCM stereo, I believe.
Using the apps on the Fire Stick 4K, I lose any HDR on YouTube. But I can
get 4K HDR with Dolby Vision in Disney+. The Disney+ app still does not appear to support Atmos though.
Further testing shows I have issues trying to get any 4K @ 60Hz signal from the AVR to my Vizio TV. I just bought a new 6' Monoprice certified HDMI cable with 18Gbps bandwidth for the connection from the AVR to the Mediabridge wall plate
. In the wall I have a 15' Blue Rigger also rated for 18Gbps and claiming to support 4K HDR @ 60Hz. However, I cannot get the Fire Stick 4K to pass 4K @ 60Hz consistently when going through the in-wall cables. (It did work for a day, but the next morning it was back to "no signal" with the Fire Stick 4K set to 2160p.
Mediabridge posted this response to a question
asking if 4K video will work through the wall plate:
TL;DR - The Mediabridge HDMI Wall Plate will not be the limiting factor to achieve 4K. We've tested this and other customer reviews prove they can support 4K. The bigger question is whether your devices will still work in 4K after adding this wall plate and a second cable to your setup.
There is no such thing as an HDMI certified coupler or a 4K certified coupler. These are passive connectors that link 2 HDMI cables together. The cables have to have the right length (length is the biggest factor), gauge and quality to be able to pass 4K. But most importantly, your source device (ie: streaming player, set-top-box, etc..) must be able to send the 4K signal across this cable-coupler-cable configuration. Then your display device (ie: TV, Projector, etc..) must be able to receive the 4K signal over this length and combination of connections as well.
In other words, these HDMI couplers installed in this Mediabridge HDMI Wall Plate will not be the limiting factors to your 4K experience. However simply adding a cable to the setup instead of having a straight run from device to device may be enough to disrupt the 4K connection. HDMI 2.0 and [email protected]
is a touchy thing and the more you add to the setup, the less likely you are to achieve it. Hoewever, we have seen and heard reports from customers that it is possible to achieve [email protected]
with this wall plate and we have seen it in our own tests as well. Therefore, we can safely say these Mediabridge HDMI Wall Plates support (as in, do not inhibit) 4K but just like any other HDMI coupler, we can't guarantee it will work with all setups.
Mediabridge Customer Support
So, according to Mediabridge, the more cables/adapters/distance you put between your source device and your display, the more difficult it is to get a reliable 4K @ 60Hz signal. And that's absolutely been my experience. A 6' HDMI -> Wallmount Coupler -> 15' in-wall HDMI appears to be too much to get it working. If I plug my AVR HDMI out directly to the TV and bypass the in-wall cables, everything works at 4K 60Hz.
I still have further testing to do but I'm hoping to find a way to get everything working through the AVR. I can use the Fire Stick 4K hooked up to the TV on HDMI4 and send the audio back via ARC, but that complicates the switching between different devices and I'd like to keep everything as simple as possible. For the time being I have the Fire Stick 4K output set to 1080p and it still supports all the available HDR formats. To me that's more important than 4K because I have a hard time seeing the difference at 10' anyway. :P