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SP-HD1X28K
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8K 1×2 HDMI 2.1 Splitter with Auto Downscaling

48Gbps, HDCP 2.3, HDR?SDR Converting, Dolby Atmos/DTS:X, EDID DIP

SP-HD1X28K
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Overview

Split one 8K HDMI 2.1 source to two displays with automatic downscaling and HDR-to-SDR conversion — enabling mixed-resolution environments without manual configuration. The KanexPro SP-HD1X28K delivers 48Gbps bandwidth and supports resolutions up to 8K@60Hz 4:2:0 12-bit and 4K@120Hz 4:4:4 12-bit. Its auto downscaling independently adjusts each output (8K→4K or 8K/4K→1080p) based on connected display capabilities, while HDR-to-SDR conversion ensures compatibility with legacy SDR displays.

HDMI 2.1 and HDCP 2.3 compliant. Supports VRR, ALLM, QMS, QFT, and SBTM. Full HDR pass-through (HDR10, HDR10+, Dolby Vision, HLG). Audio includes LPCM 7.1CH, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, and DTS:X. 8-mode EDID DIP switch for deterministic resolution control. Metal enclosure (95 × 68 × 18 mm, 177 g), 4.3W max, with USB-C service port for firmware updates.

Key features
  • HDCP 2.3 compliant
  • Support 48Gbps FRL and 18Gbps TMDS video bandwidth
  • Support video resolution up to 8K@60Hz 4:2:0 12bit, 4K@120Hz 4:4:4 12bit, as specified in HDMI 2.1
  • HDMI 2.1 protocols: VRR, ALLM, QMS, QFT, SBTM are supported
  • Support HDR, HDR 10, HDR 10+, Dolby Vision, HLG pass-through
  • LPCM 7.1CH, Dolby TrueHD, Atmos and DTS-HD Master, DTS:X Audio pass-through
  • 8K to 4K or 8K/4K to 1080P auto downscaling on all outputs
  • HDR to SDR auto converting on all outputs
  • Advanced EDID management
  • Compact design for easy and flexible installation
Technical
HDMI ComplianceHDMI 2.1
HDCP ComplianceHDCP 2.3
Video Bandwidth48Gbps FRL and 18Gbps TMDS
Video ResolutionUp to 8K@60Hz 4:2:0 12bit, 4K@120Hz 4:4:4 12bit
Color SpaceRGB, YCbCr 4:4:4, YCbCr 4:2:2, YCbCr 4:2:0
Color Depth8/10/12-bit
HDRHDR, HDR10, HDR10+, Dolby Vision, HLG
Audio FormatsLPCM, Dolby Digital/Plus/EX, Dolby TrueHD, Dolby Atmos, DTS, DTS-EX, DTS-96/24, DTS High Res, DTS-HD Master Audio, DSD
ESD ProtectionIEC 61000-4-2: ±8kV (air-gap) & ±4kV (contact)
Connection
Input1 × HDMI IN [Type A, 19-pin female]
Output2 × HDMI OUT [Type A, 19-pin female]
Control1 × SERVICE [USB Type-C, Update port]
Mechanical
HousingMetal Enclosure
ColorBlack
Dimensions95mm (W) × 68mm (D) × 18mm (H)
Weight177g
Power SupplyInput: AC 100–240V 50/60Hz, Output: DC 5V/2A (CE/FCC/UL certified)
Power Consumption4.3W (Max)
Operating Temperature0°C – 40°C / 32°F – 104°F
Storage Temperature−20°C – 60°C / −4°F – 140°F
Relative Humidity20–90% RH (Non-condensing)
Package Contents
Included1 × 48Gbps 1×2 Splitter, 1 × 5V/2A Multinational Power Supply, 1 × User Manual
Panel drawing
System diagram