AV Access 1 in 4 Out UHD 4K@60Hz 1080p@120Hz HDMI 2.0 Splitter with Auto Downscaling,18Gbps Zero Latency, 1×4 4K HDMI Splitter with HDR10 & 3D, HD Lossless Audio, HDCP 2.2, Auto EDID Management

I bought these to attempt to get 4K HDR from my PC to my living room TV. I couldn't afford a more expensive HDBaseT kit (like the SEADA HBT70B) and this unit appeared to hit the sweet spot of features and price.I've tried a few scenarios and its operation is generally as expected. The LED indicators are useful as they reflect both incoming and outgoing signal presence, useful for diagnosing problems with low quality cable or cable runs which are too long and cause too much signal loss.The HDMI2 output with integrated downscaler appears to cause no observable degradation to image quality (banding or aliasing) and there's no noticeable signal lag.I've not tested with a sync signal or clap test but it looks fast enough to be used for things like theatre presentations / office AV setups - or even things like UHD and scaled HD simultaneous output from a video camera or vision mixer in a production environment.You could definitely use this unit in your output signal chain if you're a FPS gamer, the unit doesn't seem to add any meaningful latency.I've not yet been able to verify true 4:4:4 colour space and end-to-end audio bitstream pass-through, but I suspect they do work as advertised.My first tests:1/ Taking HDCP protected output from a Sky+HD box to a primary display (4K TV) and a secondary 1080p monitor plugged into the duplicating output. I was impressed by that, as Sky+HD boxes are notorious for detecting HDCP issues and 'bluescreening' the video signal. This means the unit could be used to repeat a Sky+HD HDMI signal to multiple TVs in a house, as I had no issue sending 1080p or 1080i25 down a long run of HDMI cable.2/ Outputting HDMI 2.0 4K HDR from a Windows 10 PC (GTX 1070) to the 4K TV worked OK, although the HDMI cable length and quality makes a big difference.With a longer run of cable (30 metre HDMI cable) I could not achieve HDR, only 4K SDR or 1080p60. I managed to get a 'sweet spot' of 4K HDR using shorter cables and positioning the unit at the midpoint, but only to a maximum of 30 Hz - that's fine for all film and TV content but frame rate in games will obviously suffer.I suspect the signal loss from my long run of cheap HDMI cable (about 30 metres) takes its toll on being able to achieve >30 Hz. I'm sure with a shorter run of HDMI, or using higher quality HDMI cables (I'm using cheap HDMI 1.3 cables with female-female adaptors along the run) - or HDMI-ethernet extenders - I would be able to do 60 Hz, 4K HDR.Without using more costly equipment and cabling you can't expect miracles, and you cannot beat physics even with super-expensive HDMI cable. (And what's the point in trying? HDBaseT is really the only option for >30 metre runs.)For my intended purpose - getting HDR UHD signals from a computer ~30 metres away to a TV, without using LAN streaming - this unit works almost exactly as I was hoping for.Used at a midpoint between the PC and TV, the unit does a great job to equalise the low SNR, poor quality signal from the PC, reclocking and boosting it sufficiently for the TV's input to recognise it. When I used a single run of 30 metre HDMI cable, the SNR was not good enough to even get full HDR, so I'm happy with the performance of these units.When connecting multiple displays, it's important to connect the highest resolution display first, so it can properly clone the monitor EDID and maximum resolution properly. The manual explains the process well.

Simply Plug and play to work

It does what it's supposed to do, nothing else to add for a review. Easy to use etc, what more do you want?

Best product

I bought this to split the video and audio from my Xbox one S because my SONY STR DN1020 only oputputs 1080P. I also bought a good quality 1.4Meter HDMI2.0a cable for the job.This splitter will output 4K 60Hz to my TV but it will not output DTS HD or Dolby True HD. I thought my Xbox was being picky because it may be detecting my TV not being able to support DTS HD or Dolby True HD so I conneced my SONY BDP3700 1080P BlueRay player to the splitter and I am still not getting DTS HD or Dolby TrueHD.So I connected the new HDMI Cable from the blueRay player to my amp and the amp to my TV and I get DTS HD MA and Dolby TrueHD audio when the HDMI is going directly from the BlueRay player to my amp bypassing the splitter. I Even tried switching the output from the TV from HMDI OUT 1 to HDI 2 and the output to the amp from HDMI2 out to HDMI 1 out which made absolutely no difference.Which means that the advertising on the splitter and the manual are wrong.[UPDATE]I contacted AVAcess about my issue with the sound and their support engineer sent me a firmware that kind of fixes the problem. Now the splitter will output DTS HD Master Audio but Dolby True HD is still being output as Dolby Digital. The engineer told me that this is the only solution they have to offer. So my rating will stay at 3 stars because the advertised specs tell it outputs Dolby True HD and DTS HD which is only half true when a new firmware is flashed to it.

The video from my UHD disk player can now be viewed on a 4K display and also input to a 1080 AV receiver. The image quality for both 4K and 1080 is excellent.I have not given the product 5* as I have a problem with how the audio signals are handled. DVD audio as 5.1 surround sound is OK via an Anthem MRX receiver. However, when the audio signal from a Blu-ray disk in the UHD player is sent via the 4KSP12-S splitter / scaler to the AV receiver DTS-HD Master Audio 5.1 becomes DD 3/2 and DTS-HD Master Audio 7.1 becomes PCM 2.0 (that is stereo). I contacted AV Access asking if there was a way to allow the 4KSP12-S to handle DTS-HD sound tracks but it appears there is no solution.If your main concern is to send a UHD video signal to a 4K TV and a 1080 TV this unit is excellent. If you also want DTS-HD sound tracks then, depending on your AV equipment, it may not work. You may have more luck than me.

Worked well

I bough this device as I needed to route the 4K UHD output from a TV recorder to three tv's in various rooms.The complication was that where two of the tv's were UHD ready,the third one was'nt.I tried another device that claimed to downscale the outputs accordingly where necessary,but it did'nt do so.This device worked perfectly out of the box without needing any set up.Well made device in metal box with a variety of mounting options.I was able to secure it to the rear of the tv stand,close to the recorder.The maker has a European support centre too.