HDMI ARC Extractor Setup: Four Connections and Two Settings
Quick answer / TL;DR: Short answer: connect the extractor's HDMI input to the television's ARC port using an ARC-capable HDMI cable, connect its audio output to the amplifier, then set the television's audio output to the HDMI ARC option and enable CEC where the TV requires it for ARC. Set the digital audio format to PCM or bitstream deliberately, matching what the amplifier can decode. If there is no sound, check the ARC port label first, then the TV's audio output setting, then the cable.
Four audio lines: balanced XLR, TRS, unbalanced RCA, and speaker cable.An HDMI audio extractor takes the audio out of an HDMI stream and presents it on analogue or optical outputs. In an ARC setup it is used to send the television's audio to a soundbar, amplifier or audio distribution system that has no HDMI input of its own.
Installation is four connections and two settings. Almost every failure comes from one of the two settings, not from the wiring, which is why the order of work matters.
The Four Connections
An ARC extractor has an HDMI input that must go to the television's ARC-labelled port, and audio outputs for the amplifier. Some units also have an HDMI output for video pass-through, which is only needed if the extractor sits between a source and the display.
| Connection | From | To | Note |
|---|
| HDMI | television ARC port | extractor HDMI input | must be the ARC port, not any HDMI port |
| Audio analogue | extractor RCA or 3.5 mm | amplifier line input | stereo only |
| Audio optical | extractor TOSLINK | amplifier optical input | carries compressed 5.1 |
| Power | USB or mains | extractor | most extractors are powered |
| HDMI video out | extractor output | display | only if the extractor is inline |
The Two Settings That Silence It
The first is the television's audio output selector. It must be set to the HDMI ARC or receiver option. Many televisions default to the internal speakers, and the extractor receives nothing while the TV sounds normal. The second is the digital audio format, which must match what the amplifier can decode.
| TV audio format | Extractor analogue output | Extractor optical output | Amplifier requirement |
|---|
| PCM stereo | works | works | any |
| Dolby Digital 5.1 | stereo downmix or silence | works | Dolby Digital decoder |
| Dolby Digital Plus | usually silence | works if passed | DD+ decoder |
| Dolby Atmos | silence on analogue | needs eARC | eARC and Atmos support |
The analogue outputs on most extractors handle PCM only. If the television is set to bitstream and the content is Dolby Digital, the analogue output produces nothing. This is the single most common complaint, and the fix is to change the TV's format setting rather than the cable.
CEC and Why It Is Needed
ARC depends on CEC for device discovery in many implementations. If CEC is disabled on the television, the ARC channel may not activate even though the cable and port are correct. This is a design dependency rather than a fault, and it is invisible unless you know to look for it.
- Enable CEC, sometimes labelled Anynet+, Bravia Sync, Simplink or Viera Link
- Expect side effects: source switching and power control may change behaviour
- If CEC causes unwanted switching, test with it temporarily enabled to confirm ARC works
- Some extractors present themselves as a CEC device and appear in the TV's device list
Real-World Applications
Older amplifier with a modern television
The amplifier has optical and analogue inputs only, and the television has ARC. An extractor bridges the two, and the optical output preserves 5.1 while the analogue output gives stereo to a second zone. This is the classic use case and the reason these devices sell.
Distributed audio in a bar or clinic
One television, audio to a ceiling speaker system through an amplifier in a rack. The extractor sits at the television and the analogue output runs to the rack. Set the television to PCM stereo, because the distribution amplifier expects a stereo line-level signal.
Conference room with in-ceiling speakers
The display's own speakers are inadequate and the amplifier is analogue. An extractor takes the display's audio to the amplifier, and the room's volume is controlled at the amplifier rather than by the display remote, which is the behaviour users expect in a meeting room.
Where an extractor is the wrong buy
When the amplifier has an HDMI input and supports ARC or eARC. In that case connect the amplifier directly to the TV's ARC port and skip the extractor, which removes a power supply and a conversion stage from the chain.
Related reading: Choosing an HDMI ARC audio extractor — blogs/news/hdmi-arc-extractor-buying
Related reading: Extractor compared with a plain ARC connection — blogs/news/hdmi-audio-extractor-vs-arc
Standards and Verification
ARC and eARC are defined in the HDMI specification from HDMI Licensing Administrator. CEC is part of the same specification and provides the control channel that ARC depends on for discovery. Digital audio formats are defined by their own bodies, with Dolby Digital and Dolby Atmos specified by Dolby Laboratories.
Before buying, confirm three things about the extractor: which audio formats it can pass on the optical output, whether the analogue output is limited to PCM, and whether it supports ARC only or also eARC. A unit described as ARC capable may not pass eARC, which matters for object-based audio.
After installation, verify with content that actually carries the format you intend to use. A stereo test tone proves the cable, not the format support, and the failure only appears with a 5.1 film or a sporting broadcast.
Label the television's ARC port and the extractor's input. In a wall-mounted installation the ports are hard to reach, and a future technician who moves the cable to a different HDMI port will produce exactly the silent failure this page describes.
Frequently Asked Questions
Which HDMI port does the extractor connect to?
The television's ARC-labelled port, which is usually HDMI 1 or HDMI 2 and marked ARC or eARC. Connecting to any other port gives no audio, because only the ARC port carries the return channel.
Why is there no sound from the analogue output?
Most often the television is outputting a bitstream format such as Dolby Digital, which the analogue output cannot decode. Set the television's digital audio format to PCM for analogue use.
Do I need to enable CEC?
Usually yes. ARC relies on CEC for device discovery in many implementations, so a disabled CEC setting can prevent ARC from activating even with correct wiring.
Does an extractor support eARC?
Only if it is specified for eARC. Many units support ARC only, which limits the return path to compressed formats. For object-based audio, confirm eARC support explicitly.
Can I use an extractor with a soundbar?
Yes, if the soundbar has an optical or analogue input and no HDMI. If the soundbar has an HDMI ARC port, connect it directly to the television instead and leave the extractor out of the chain.
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