Alfatron CHKA2



Alfatron CHKA2

The ALF-CHKA2 is a small-size HDMI 2.0 audio de-embedder with 1 HDMI input, 1 HDMI output, and three types of audio outputs. It is designed to extract audio from a 4K HDMI signal via stereo balanced L/R audio, analog RCA, and coaxial digital audio output ports. It supports 4K@60Hz/4:4:4 HDR, EDID & CEC pass-through, the transmission rate is up to 18Gbps. Moreover, there are three audio modes which can be selected in order to be compatible with various audio processing devices.


Product Features


  • Supports stereo balanced L/R audio, analog RCA, and coaxial digital audio output ports
  • Supports three audio modes PASS, BITSTREAM, and PCM
  • HDMI input supports HDCP 2.2, and the output supports HDCP 1.4
  • Supports HDMI 2.0 4K@60Hz/4:4:4 HDR, EDID & CEC pass-through
  • The transmission rate is up to 18Gbps

Additional information

Weight 0.244 kg
Dimensions 0.77 × 12.9 × 0.21 cm


Input (1) HDMI
Input Connector (1) 19-pin type-A female HDMI 2.0, HDCP2.2
Output (1) HDMI
Output Connector (1) 19-pin type-A female HDMI 2.0, HDCP1.4
Output (1) Stereo balanced audio L/R; (1) Analog audio L+R ; (1) COAX
Output Connector (1) 5-Pin phoenix connector; (1) RCA ; (1) Coaxial audio connector
Audio Format Support Dolby D (True HD)/ DTS (HD-Master Audio)/ PCM
Max data rate 18Gbit/s
Max Resolution 4Kx2K@60Hz 4:4:4
Temperature -10~ 55℃
Reference Humidity 10% ~ 90%
Power Consumption 3 W (Max)
Power Supply Input: 100VAC~240VAC, 50/60Hz; Output: 12VDC 1A
Dimension (W*H*D) 129mm x 21.5 mm x77 mm
Net Weight 244g

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Technical Sheet

User Manual



1.Q – What is the ALF-CHKA2?

A – It is a audio de-embedder which extracts audio from the HDMI input signal.

2.Q – Does the unit support CEC?

A – Yes, it supports CEC pass-through.

3.Q – What audio outputs does the device support?

A –  It has 1 x L&R RCA, 1 x L&R stereo balanced out via phoenix connector and a COAX output.

4. Q – Can I use this unit with an amplifier?

A – Yes. For instance, connect the RCA outputs of the ALF-CHKA2 to the RCA input of the amplifier.

5. Q – What audio formats are supported?

A – Dolby D (True HD) / DTS (HD-Master Audio) / PCM