SP-HD1X48K: One 8K Source to 8K, 4K and 1080p Displays

The SP-HD1X48K is a 1×4 HDMI 2.1 splitter that sends one source to four displays, and each display does not have to be the same kind. Each output reads its own display's capabilities. It then lowers the resolution and converts HDR to SDR when that display needs it, so an 8K screen and a 1080p screen can share one source without separate scalers. It is for any job where one HDMI 2.1 source feeds a mix of 8K, 4K and 1080p screens.

Applies to: SP-HD1X48K 8K 1×4 HDMI 2.1 Splitter with Auto Downscaling

What does the SP-HD1X48K do?

It takes one HDMI source on HDMI IN and sends it to four HDMI outputs at up to 48Gbps FRL (18Gbps TMDS). It supports up to 8K@60Hz 4:2:0 12-bit and 4K@120Hz 4:4:4 12-bit. It is HDMI 2.1 and HDCP 2.3 compliant. It passes HDR, HDR10, HDR10+, Dolby Vision and HLG, plus the HDMI 2.1 features VRR, ALLM, QMS, QFT and SBTM. The splitter needs no network setup and has no network port. It works with HDMI connections and the supplied 5V power supply.

How does auto downscaling decide what each display gets?

Each output reads the EDID of its own display. It then sets the resolution and converts HDR to SDR separately from the other three outputs. With an 8K HDR source connected:

• OUT 1 to an 8K HDR TV: the signal passes through unchanged.
• OUT 2 to a 4K HDR TV: receives 4K HDR.
• OUT 3 to a 4K SDR TV: receives 4K SDR.
• OUT 4 to a 1080p TV: receives 1080p SDR.

HDR-to-SDR conversion on one output does not affect the others. HDR displays still get HDR, and SDR displays get the converted signal.

Are there signals it cannot downscale?

Yes. Downscaling does not work for 8K signals that use DSC (Display Stream Compression), or for resolutions the splitter does not support. If a 4K or 1080p display goes blank when the source sends 8K, first check whether the source is using DSC. Then check that display's EDID and power-cycle all devices. A DVI display works at 1080p and shows the picture, but it gets no audio.

Will a 4K120 gaming console keep its HDMI 2.1 features?

Yes. The splitter supports 4K@120Hz 4:4:4 12-bit and passes VRR, ALLM, QMS and QFT. A console's gaming features therefore reach the HDMI 2.1 displays on the outputs.

Which audio formats pass through, and can audio be broken out?

Audio passes through on HDMI. Supported formats include LPCM 7.1CH, Dolby Digital/Plus/EX, Dolby TrueHD, Dolby Atmos, DTS, DTS-EX, DTS-96/24, DTS High Res, DTS-HD Master Audio, DTS:X and DSD. The SP-HD1X48K cannot de-embed audio. For an audio breakout, use the SP-1X2A8K.

How is the EDID set?

Use the eight-mode EDID DIP switch on the unit:

• 111: copies the EDID of the display on OUT 1.
• 110: 4K60 with 2-channel audio.
• 101 through 000: FRL 8K HDR, with 2, 5.1 or 7.1 channels at the FRL12G and FRL10G rates.

If one output stays dark or a display shows no signal, set the switch to 111 and power-cycle the system.

Can a control system manage it?

No. There is no RS-232, Telnet or network control. The splitter works on its own: each output scales automatically, and you set the EDID with the DIP switch. The USB Type-C SERVICE port is for firmware updates only.

What cables and power does it need?

Use Ultra High Speed HDMI cables, and keep each cable to 9.8 ft (3m) or less for 8K signals. The included 5V/2A multinational power supply accepts AC 100–240V 50/60Hz, and the unit draws 5.5W at most. Connect the supply through a surge protector. The Power LED lights red when the unit has power. The IN LED lights green when it detects an active source. Each OUT LED lights green when its output is active.

Key specifications