Name: 4K HDMI/eARC over HDBaseT 3.0 Extender (70m)
Brand: KanexPro
SKU: EXT-HD4KEARC-70M

Overview

Extend 4K HDMI and eARC/ARC signals over a single CAT6A/7 cable - up to 40m at 4K60 4:4:4 or 70m at 4K30/1080p - 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, DTS:X, and DTS-HD Master Audio support.

HDMI Compliance	HDMI 2.0b
HDCP	HDCP 2.3
Video Bandwidth	18 Gbps
HDBaseT Version	HDBaseT 3.0 (VS310 chipset)
HDR Formats	HDR10, HDR10+, Dolby Vision LLM, HLG
eARC/ARC	Pass-through from RX HDMI OUT to TX HDMI IN
4K60 4:4:4 Distance	131 ft / 40 m (CAT6A/7)
4K30/1080p Distance	230 ft / 70 m (CAT6A/7)
Dimensions (TX & RX)	5.67" x 3.07" x 0.91" (W x D x H) / 144 x 78 x 23 mm
Weight	TX: 0.68 lbs (308 g) / RX: 0.68 lbs (307 g)
Power Supply	AC 100-240V to DC 24V/1A (locking); Bi-directional PoC; 11W total
Package Contents
1x	Transmitter (TX) unit
1x	Receiver (RX) unit
2x	3-pin 3.5mm Phoenix Connector (male)
1x	24V/1A Locking Power Supply
4x	Mounting Ears
8x	Machine Screws (KM3x4)
1x	IR Blaster Cable (1.5m)
1x	IR Receiver Cable (1.5m)
1x	User Manual

4K HDMI/eARC over HDBaseT 3.0 Extender (70m) panel drawing

4K HDMI/eARC over HDBaseT 3.0 Extender (70m) system diagram

4K HDMI/eARC over HDBaseT 3.0 Extender (70m) applications

Manual~~Installation and operation~~

Spec sheet~~Full specification~~

Sales sheet~~For bid packages~~

What is the maximum resolution and video bandwidth?

The EXT-HD4KEARC-70M is HDMI 2.0b / HDCP 2.3 compliant with 18Gbps video bandwidth, built on the HDBaseT 3.0 VS310 chipset, supporting resolutions up to 4K2K@60Hz (YUV 4:4:4), plus 1080p, 720p, and 480/576p/i.

What HDR formats are supported?

HDR10, HDR10+, Dolby Vision LLM, and HLG are supported.

What API commands are available over the SERVICE port?

Connect the USB-C SERVICE port to a PC at 115200 baud, 8N1. Commands include "?" (list all commands), "get version" (firmware version), "reboot", "status", "get arc", "get cec", and "set hdbt update".

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, DTS:X, or DTS-HD Master Audio from the TV returns over the same CAT cable to the TX HDMI port for the AVR to decode.

What cable and wiring are required?

Use CAT6A/7 cable, wired direct/straight-through with T568B pinout at both ends (non-crossover), from TX HDBaseT OUT to RX HDBaseT IN.

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).

There is no picture on the display. What should I check?

Verify CAT6A/7 is wired straight-through (not crossover) with T568B at both ends, confirm the run does not exceed 40m for 4K60, check the LINK LED on both TX and RX, and confirm the source is outputting a supported resolution.

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.

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.

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