4K HDMI/eARC over HDBaseT 3.0 Extender (70m)
Extend 4K HDMI and eARC/ARC over a single CAT6A/7 cable up to 70m. HDBaseT 3.0, HDCP 2.3, Dolby Atmos, bi-directional IR, RS-232 & 24V PoC. TX/RX kit.
Extend 4K HDMI and eARC/ARC signals over a single CAT6A/7 cable - up to 70m at 4K30/1080p, or 40m at 4K60 4:4:4 - with no second cable run for audio return. The KanexPro EXT-HD4KEARC-70M eliminates the need for a separate cable to return audio from a remote TV to a local AV receiver or soundbar. Built on HDBaseT 3.0 VS310 chipset, HDCP 2.3, with Dolby Atmos and DTS-HD Master Audio support.
- HDBaseT 3.0 VS310 chipset — extends uncompressed 4K60 4:4:4 up to 40m and 4K30/1080p up to 70m over a single CAT6A/7 cable
- eARC/ARC pass-through returns high-bitrate audio from the remote TV back to a local AV receiver or soundbar over the same CAT cable — no second cable required
- HDCP 2.3 compliant with 18Gbps video bandwidth; HDR10, HDR10+, Dolby Vision LLM, and HLG pass-through
- Full HD audio pass-through: LPCM, Dolby Atmos, Dolby TrueHD, DTS-HD Master Audio, and DSD
- Bi-directional 24V PoC — one power supply at either end powers both TX and RX; PoC on/off switch on each unit
- Bi-directional IR pass-through (wideband 20–60kHz, 12V) with included IR blaster and receiver cables
- RS-232 pass-through for third-party control system integration; USB-C service port for firmware upgrades and API commands
- Compact metal enclosure (144x78x23mm) with LED link and signal indicators; mounting ears included
Specifications| HDMI Compliance | HDMI 2.0b |
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| HDCP | HDCP 2.3 |
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| Video Bandwidth | 18 Gbps |
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| HDBaseT Version | HDBaseT 3.0 (VS310 chipset) |
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| HDR Formats | HDR10, HDR10+, Dolby Vision LLM, HLG |
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| eARC/ARC | Pass-through from RX HDMI OUT to TX HDMI IN |
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| 4K60 4:4:4 Distance | 131 ft / 40 m (CAT6A/7) |
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| 4K30/1080p Distance | 230 ft / 70 m (CAT6A/7) |
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| Dimensions (TX & RX) | 5.67" x 3.07" x 0.91" (W x D x H) / 144 x 78 x 23 mm |
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| Weight | TX: 0.68 lbs (308 g) / RX: 0.68 lbs (307 g) |
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| Power Supply | AC 100-240V to DC 24V/1A (locking); Bi-directional PoC; 11W total |
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| 1x | Transmitter (TX) unit |
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| 1x | Receiver (RX) unit |
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| 2x | 3-pin 3.5mm Phoenix Connector (male) |
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| 1x | 24V/1A Locking Power Supply |
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| 4x | Mounting Ears |
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| 8x | Machine Screws (KM3x4) |
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| 1x | IR Blaster Cable (1.5m) |
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| 1x | IR Receiver Cable (1.5m) |
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| 1x | User Manual |
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Questions
- What audio formats pass through, and how does eARC/ARC work?
- The link passes LPCM, DD/Plus/EX, Dolby TrueHD, Dolby Atmos, DTS, DTS-HD Master Audio, and DSD. eARC/ARC passes through from the RX HDMI OUT (TV) back to the TX HDMI IN (AVR/soundbar).
- What HDR formats are supported?
- HDR10, HDR10+, Dolby Vision LLM, and HLG are supported.
- How is eARC audio routed to a local AVR or soundbar?
- Connect the AVR or soundbar to TX HDMI IN alongside the source, and connect the eARC-capable TV to RX HDMI OUT. Dolby Atmos or DTS-HD Master Audio from the TV returns over the same CAT cable to the TX HDMI port for the AVR to decode.
- How is RS-232 wired for a third-party control system?
- RS-232 pass-through uses a 3-pin 3.5mm Phoenix connector on both TX and RX; a control system can send commands over RS-232 or the USB-C API.
- How is the unit powered, and can one supply power both ends?
- The included AC-to-DC 24V/1A locking power supply connects to either TX or RX. With the PoC switch ON (KanexPro default) on the powered unit, it powers the other unit over the CAT cable, so only one supply is required.
- What are the unit dimensions and weight?
- TX and RX each measure 5.67 x 3.07 x 0.91 in (144 x 78 x 23mm); TX weighs 0.68 lb (308g) and RX weighs 0.68 lb (307g).
- eARC audio is not returning to the AVR/soundbar. What should I check?
- Confirm eARC/ARC and CEC are enabled in the TV's audio menu, verify the AVR is connected to TX HDMI IN with the eARC input selected, and run the "get arc" command via the SERVICE port to confirm ARC is active.
- PoC is not powering the remote unit. What should I check?
- Confirm the PoC switch on the powered unit is ON (KanexPro default) and that the remote unit's PoC switch is also ON. If the issue persists, power both units independently with separate 24V/1A supplies.
- What application fits the EXT-HD4KEARC-70M?
- It fits equipment-rack installs where the AVR or soundbar stays with the source and the eARC-capable TV is at distance: the single CAT6A/7 run carries 4K video out and eARC audio back, eliminating a second audio cable run.
- What differentiates this from a basic point-to-point HDMI extender?
- Built on the HDBaseT 3.0 VS310 chipset with HDCP 2.3, RS-232 pass-through, a USB-C API, and bi-directional 24V PoC, it targets professional control-system integrations rather than simple plug-and-play consumer runs.