J-Tech DigitalScaler/Multi-Resolution Output (MRO) 18GBps 1x4 HDMI 2.0 Splitter HDR10/Dolby Vision 4K@60Hz 4:4:4 [JTECH-18GSP14M]

Good unit, solidly built. I have two concerns with it. It can split between 4k and Full HD, or it can output Full HD (1080p) and HD (720p), but it can't do 4k and HD. Secondly, the power jack is finicky, and if the power cable is bumped, the unit sometimes loses power. Tried a cable and power supply of my own, and it still occurred, so it's definitely the jack that's the issue. Neither of these will be a major concern for me in the long run, but as I was testing and arranging gear, they were small inconveniences.

Contrary to the advertising it is not a multi-resolution output scaler. I received this admission from tech support after I was uanble to get it work. It may scale to 1080p under a limited set of parameters but it won't tailor the output to each attached device. In my experience the "Mixed" feature seems to select the lowest common parameters and passes that EDID back to the source. Admittedly my use-case was not common in the consumer device space. My input is 1920x1200 (16x10 aspect) rather than 16x9 aspect.The "Copy" EDID features works well and prevents a problem I've seen with cheaper splitters where attaching or turning on other devices causes a signal renegotiation and disruptoin for all devices. When using the "Copy" feature the source and the "main" output device on port 4 continue to work without interruption regardless of the status of devices on ports 1-3.

This small splitter works exactly as advertised. Using it to fool my ONKYO receiver and get Dolby Atmos while sending video directly to LG OLED from Apple TV4 to get Dolby Vision. Works like a charm.

I bought this product as I have an older AVR which no longer supports some of the newer video features forcing me to connect other sources direct to the TV. My early generation LG OLED TV does not support eARC and limited the optical output to stereo for some HDMI inputs. I took a new Roku 4800R and used this Splitter and good quality (High Speed\Ethernet) HDMI cables to connect to my TV (using HDMI1 from the instructions) and AVR (HDMI2). I did have to change to "Copy" from the default "Fixed" (which surprised me), but when I did so I was able to again get "Dolby Vision" and "Dolby Atmos" on my TV and full 7.1 "Dolby Digital Plus" input to my AVR. I do see now, that the outside of the box clearly (as opposed to the more cryptic manual) DOES show to use the EDID Copy mode for 4k Dolby Vision support (which makes sense that EDID Fixed is straight 4k 60hz support as that is more generic). As I was successful, I didn't try "Mixed Mode" as it is implied that may not work with Dolby Vision. (There is a note: "Source Devices and ALL connected TVs must support Dolby Vision\HDR 10", so it looks like "Copy" was the way to connect the AVR as in my setup it can disregard extraneous video signals.) The Splitter did its job. The sound is much better and to the expected standard. The video was unaffected (great) on my TV with no noticeable change caused by the introduction of the splitter.

What a colossal waste of time! Per the description I should be able to feed this device a video signal and it should pass the video to the first output and scale the second HDMI output to match the EDID of the secondary device (so called Mixed EDID mode). I have one device that accepts 1080p or 720p, and a secondary that accepts 1080i or 720p (I'd be happy with either). Instead of scaling the video to the secondary device, it provided 1080p video to both devices. The secondary device does not report 1080p support in it's EDID (I confirmed this). I even plugged an EDID emulator to guarantee no resolution greater than 720p was reported to the splitter, yet it still pushed 1080p out. I tried every switch position possible. I tried multiple power on and device plug in sequences. I even tried sprinkling my last of bit pixel dust over the device while chanting in cursive. Ultimately, the only way to get video on both devices was to provide this splitter 720p in the first place.When I tried to reach out to tech support, I was accosted with a barrage of captchas that once solved, expired before I could even finish typing the first sentence on the company's web form. Now officially at the end of the rope, I am pleased to say the situation was immediately and completely rectified by engaging more enjoyable and satisfying activities such as watching the grass grow from my dentist's chair, watching paint dry in a room with all the lights turned out, and watching UPS take this device back to the seller.