4K HDMI, Audio & IR Extender via CATx - up to 300 Ft.


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The XTENDEX 4K HDMI Extender transmits uncompressed digital HDMI signal and IR up to 300 feet over a single CATx cable. Each video extender consists of a local unit that connects to an HDMI source and a remote unit that connects to an HDMI display.

Features & Benefits

  • Transmits HDMI signal over one CAT5e/6/6a/7 solid cable.
    • Extend up to 250 feet with solid CAT5e/6 cable.
    • Extend up to 300 feet with solid CAT6a/7 cable (23 AWG).
  • Supports Ultra-HD 4Kx2K resolutions to 3840x2160 (30Hz), 2K resolution 2048x1080, HDTV resolutions to 1080p, and computer resolutions to 1920x1200.
  • Only one power supply is necessary to power both the local and remote units.
  • HDMI features supported:
    • HDMI 1.4
    • x.v.Color, sYCC601 color, Adobe RGB Color and Adobe YCC601 color
    • Dolby TrueHD, DTS-HD Master Audio, Dolby Digital, and DTS
    • Bandwidth up to 340 MHz (10.2 Gbps).
    • Support for CEC (consumer electronic control) compatible devices.
    • Lip Sync
  • HDCP compliant.
  • Supports the DDC2B protocol.
  • Mounting brackets included for easy surface/wall mounting.
  • High quality, rugged steel construction with durable powder coat finish.
Product Use Diagram

Product Specifications

Resolutions4Kx2K, 2K Cinema, 1080p, 1920 x 1200
AudioSupports embedded digital audio through HDMI compatible TVs or audio receivers, Auto equalization for different lengths of CAT5e/6/7 cable.
Local Unit
SourceComputer or Ultra-HD video source with HDMI output
Input Connector1 x HDMI
IR1 x 3.5mm
Output Connector1 x RJ45
Remote Unit
Input Connector1 x RJ45
IR1 x 3.5mm
Output Connector1 x HDMI
TypePowered by single supply to transmitter or receiver
Supply100-240 VAC 50/60Hz, AC Adapter
Operating Temperature32°F - 122°F (0-50°C)
Storage Temperature-20°F - 140°F (-30-60°C)
Humidity17 - 90% RH, Non-condensing
ApprovalsCE, RoHS, TAA Compliant
Warranty2 Years
Question: Does this extender include the IR emitter and receivers in the box?
Answer: Thank you for your inquiry,

Here is what's included with NTI ST-C64K-300 kit:

NTI ST-C64K-300 Package Contents
  • NTI XTENDEX Local Unit
  • NTI XTENDEX Remote Unit
  • 1-HD-3-MM 3 foot male-to-male HDMI video cable
  • 1-RCA-3-MM 3 foot male-to-male RCA cable (ST-C6HD-DA-HDBT and ST-C6HDA(E)-HDBT models only)
  • 1- SA-3-MM 3 foot male-to-male 3.5mm stereo audio cable (ST-C6HDA(E)-HDBT models only)
  • 1-100VAC to 240VAC at 50 or 60Hz-24VDC/1.0A AC Adapter (NTI#PS4202) (NOT included with ST-C6HD-HDBT-12VNPS)
  • 1- Power Cord- country specific (NOT included with ST-C6HD-HDBT-12VNPS)
  • 3 Foot IR-EMITTER (IR-EMTR-3)
  • 3 Foot IR-RECEIVER (IR-RCVR-3)
  • 2.1x.5.5mm DC Plug with 36" Lead (ST-C6HD-HDBT-12VNPS only)

Question: I have purchased this model extender before and unlike the ST-C6HD-DA-HDBT, this model has a noisy internal fan operating all the time. Do you have an extender that supports 4K but that does not have the internal fan?
Answer: Thank you for your inquiry,

We are sorry to hear the noise is above comfort level-

For a fan-less 4K (@30Hz) HDMI KVM Extender, we would recommend looking into the Rose CRK-1DTXT-HD6 HDMI KVM Extender.

For a fan-less 1080P / FHD HDMI KVM Extender, we would recommend looking into the Adder XDIP - you can connect two of those nodes directly using a single cable up to 330 feet (100 meters) in length (or via a network switch to allow interaction between receiver/transmitter combinations).