SP-HDMI2X4-8K: What You Can Control on Each Output
All four outputs carry the same selected source, but each one independently downscales 8K to 4K or 2K and converts HDR to SDR for its own display.
Yes, the SP-HD1X28K can feed a 4K HDR display and an older 1080p SDR display from one source at the same time. The splitter reads the EDID of each connected display and sets each output on its own. A display that can show the source gets it unchanged. A less capable display gets a downscaled signal converted to SDR. At the default EDID DIP setting, 111, the source formats its output for the display on OUT 1.
Applies to: SP-HD1X28K 8K 1×2 HDMI 2.1 Splitter with Auto Downscaling
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What does each display receive when one is 4K HDR and the other is 1080p?
With a 4K HDR source, a 4K HDR TV on OUT 1 receives the 4K HDR signal unchanged. A 1080p TV on OUT 2 receives a 1080p SDR signal that has been downscaled and converted. The two outputs are handled separately, so the conversion on OUT 2 does not change the HDR signal on OUT 1. The splitter downscales 8K to 4K, or 8K/4K to 1080p, on all outputs. HDR-to-SDR conversion also works on all outputs. If the source sends Dolby Vision, the output feeding the SDR display gets SDR.
Which EDID DIP setting should I use?
Start at the factory default, 111, which copies the EDID of the display on OUT 1. The source then formats its output for that display, and the splitter adapts the other output from there. Connect the display you want the source to format for to OUT 1. If you want the source to see a fixed EDID instead, the three-position DIP switch offers these modes:
- 111: Copy OUT1 EDID (default)
- 110: 4K60 4:4:4, 2.0CH
- 101: FRL12G 8K HDR, 2.0CH
- 100: FRL12G 8K HDR, 5.1CH
- 011: FRL12G 8K HDR, 7.1CH
- 010: FRL10G 8K HDR, 2.0CH
- 001: FRL10G 8K HDR, 5.1CH
- 000: FRL10G 8K HDR, 7.1CH
Can I load a custom EDID or pass a non-standard resolution?
The documentation only describes choosing the EDID with the DIP switch, from the eight modes above. It does not describe loading a custom EDID. The USB-C SERVICE port is listed only for firmware updates, and the splitter needs no control system. The supported video resolutions are listed as up to 8K@60Hz 4:2:0 12bit and 4K@120Hz 4:4:4 12bit, and the documentation names no non-standard timings. Before you specify the splitter for a non-standard resolution, ask KanexPro support to confirm it.
Why is downscaling not working?
Downscaling does not work with an 8K DSC input, so first check what format the source is sending. Next, make sure the splitter is reading the display's EDID correctly by returning the DIP switch to 111. Then power-cycle both the splitter and the displays.
Why is there no picture on one output?
Each OUT LED lights green when its output is active. Use Ultra High Speed HDMI cables. For 8K, keep each cable to 3m or less.
If an output is still dark, check that the display on it supports the resolution being sent. Then try a different EDID DIP setting and power-cycle the splitter.
Why is there no audio on the downscaled display?
A display running in DVI mode will not play audio when it receives downscaled 1080p. Make sure the display on that output supports HDMI audio at the downscaled resolution. The splitter passes LPCM 7.1CH, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio and DTS:X.
Key specifications
| HDMI / HDCP Compliance | HDMI 2.1 / HDCP 2.3 |
| Video Bandwidth | 48Gbps FRL and 18Gbps TMDS |
| Video Resolution | Up to 8K@60Hz 4:2:0 12bit, 4K@120Hz 4:4:4 12bit |
| HDR | HDR, HDR10, HDR10+, Dolby Vision, HLG |
| Input / Output | 1 × HDMI IN / 2 × HDMI OUT [Type A, 19-pin female] |
| Control | 1 × SERVICE [USB Type-C, Update port] |
| Power Supply | Input: AC 100–240V 50/60Hz, Output: DC 5V/2A (CE/FCC/UL certified) |
| Power Consumption | 4.3W (Max) |
