Name: 48Gbps 8K 2×8 HDMI Matrix Splitter with Independent Downscaling & Audio De-embedding
Brand: KanexPro
SKU: SP-HDMI2X8-8K

Question 1

What is the maximum resolution, chroma, and refresh rate the SP-HDMI2X8-8K supports, and what HDMI/HDCP version does it use?

Accepted Answer

The splitter is HDMI 2.1 and HDCP 2.3 compliant, supporting up to 8K@60Hz at 4:2:0 12-bit, 8K@30Hz at 4:4:4 12-bit, and 4K@120Hz at 4:4:4 12-bit, at up to 48Gbps video bandwidth.

Question 2

What HDR formats and gaming features pass through the splitter?

Accepted Answer

It passes HDR, HDR10, HDR10+, Dolby Vision, and HLG, along with ALLM and VRR gaming features.

Question 3

What is the RS-232/API connection and command format for control integration?

Accepted Answer

Connect the SERVICE USB-C port (fixed at 115200 bps) or the RS-232 3-pin Phoenix port (configurable 4800-115200 bps, default 115200) to a PC serial terminal, using 8 data bits, 1 stop bit, no parity, and a end mark. Send ? to list all available commands.

Question 4

What API command routes a specific input and forces downscaling on an output?

Accepted Answer

Use set input x (x = 1 or 2) to select the active HDMI input, and set output x downscale y (x = 0-8, y: 0 = auto, 1 = bypass, 2 = force 1080p) to control per-output downscaling.

Question 5

What is included in the box?

Accepted Answer

The package includes the 48Gbps 2x8 HDMI splitter, a 12V/2.5A multinational locking power supply, an IR remote, a 1.5m IR wideband receiver, a 3-pin Phoenix connector, a 5-pin Phoenix connector, two mounting ears, four KM3x6 machine screws, and a user manual.

Question 6

What are the physical dimensions and weight for rack or shelf placement?

Accepted Answer

The unit measures 12.60 in (W) x 3.94 in (D) x 0.85 in (H) (320mm x 100mm x 21.5mm) and weighs 1.79 lbs (810g), with included mounting ears for rack or surface installation.

Question 7

No video appears on one or more displays. What should I check?

Accepted Answer

Confirm certified 48Gbps HDMI Ultra High Speed cables no longer than 3m are used, try setting the EDID to match the display's native resolution, and if displays have mixed resolutions, set downscaling to auto with set output 0 downscale 0.

Question 8

There is no audio from the optical or analog output. What should I check?

Accepted Answer

Select an EDID preset that includes audio (a preset with 5.1CH DTS/DOLBY for optical, or any preset for analog LPCM 2CH), confirm analog audio is not muted with set analog mute off, confirm gain is at 0dB with set analog gain 0dB, and verify the 5-pin Phoenix wiring matches L+, L-, GND, R+, R- for b

Question 9

What deployment scenarios suit the SP-HDMI2X8-8K?

Accepted Answer

It fits professional installs needing two switchable 8K-capable sources routed to eight displays with independent per-output downscaling and HDR-to-SDR conversion, such as sports bars, command centers, or video walls mixing 8K and legacy displays.

Question 10

How does independent per-output downscaling benefit mixed-display rooms?

Accepted Answer

Each of the 8 outputs can independently downscale an 8K source to 4K or force 1080p, so a single source feeds a mix of 8K, 4K, and legacy displays across an eight-screen fleet without external scalers.