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Sydney's HDMI analog converter Expert


Elac - HDX21 - HDMI analog converter

by Elac

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The ELAC HDX21 is the perfect solution for delivering a variable analog audio signal from modern televisions with only HDMI ARC connectivity. Using the HDX21, you can control the volume of connected active wired or wireless speakers (e.g. ELAC Navis ) or external amplifiers (e.g. ELAC IS-AMP340 ) with the remote control of the television, without the need for a complicated home automation system.

Analog input

The analog input on the HDX21 allows automatic switching between the audio signal from the television and an external audio source. You can adjust the switching time and threshold level for when the external audio source becomes active. 

Why is a good analog audio signal from a television desirable?

A modern 'smart' television has many more functions than before, such as streaming services, YouTube, etc. Instead of a soundbar, there is an increasing need for a qualitatively better display via, for example, an existing hi-fi system. Modern televisions often no longer have an analog RCA output and many hi-fi installations do not have an HDMI input. In addition, HDMI-eARC as a connection is still not 100% reliable.

An optical output on a TV has no variable volume control, with the result that the volume cannot be adjusted with the TV remote control. The HDX21 is the solution to all these HDMI problems. The analog output is variable, so that the volume can be adjusted with the TV remote control. 

HDMI adapter with additional analog input

The HDX21 also has an analog input to add an additional audio source. HDMI is the priority input and is used automatically. When a source is detected at analog input, the HDX21 automatically switches it to the output. If this audio signal stops, the HDX12 will automatically return to the HDMI input once the response time has elapsed.

This reaction time (delay time) can be set with the 'Delay' button on the back. With the 'Treshold' button you can set the signal strength at which this is desired. The 12V trigger output can automatically turn on the receiving device if this device has a 12V trigger input.


HDMI input: ARC, eARC
Analog input:
Analog output: RCA L/R
Threshold setting: 2-200 mV
Delay setting:
0.5 – 130 seconds
12V trigger output: 100 mV (for both HDMI and analog input)
Nutrition: external DC 12V
Dimensions: height: 22
width: 155
depth: 74
0.680 kg

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