Reference
4K HDMI Audio Decoder & Down Mixer with Dolby/DTS
Decode & Down-Mix Dolby/DTS Bitstream to Analog Stereo — 18Gbps 4K60 4:4:4 HDR Pass-Through with Optical & RCA Output
AUD-DCODEHDMI-4KUPC 813982023925
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Overview
Extracts audio from any HDMI source and decodes Dolby/DTS bitstreams down to 2-channel analog stereo via RCA L/R output. Optical S/PDIF delivers up to 5.1-channel Dolby Digital or DTS. Full 4K60 4:4:4 HDR video passes through to the display untouched.
A front-panel 3-position switch selects TV (copy EDID), Bitstream (multichannel pass-through on optical), or 2CH (decode and down-mix to stereo). LED indicators show PCM, Dolby, or DTS decode state. HDMI 2.0b, HDCP 2.2, CEC bypass. Compact metal enclosure, 5V/1A powered.
Key features
- HDMI 2.0b (18Gbps), HDCP 2.2, and DVI compliant
- Video resolutions up to 4K2K@50/60Hz (YUV 4:4:4)
- Extract HDMI audio to multi-channel optical (S/PDIF) or L/R analog audio
- Bitstream audio down-mix to L/R analog output (Dolby/DTS decode)
- Optical audio supports LPCM 2CH, Dolby Digital 2/5.1CH, DTS 2/5.1CH
- HDMI High Bit Rate (HBR) audio pass-through
- Audio sample rates up to 192kHz
- 10-bit HDR (High Dynamic Range) pass-through
- CEC pass-through for single-remote control
| Specification | Value |
|---|---|
| Technical | |
| HDMI Compliance | HDMI 2.0b |
| HDCP Compliance | HDCP 2.2 and HDCP 1.4 |
| Video Bandwidth | 18Gbps |
| Video Resolutions | Up to 4K2K@50/60Hz (YUV 4:4:4), 4K2K@30Hz, 1080P@120Hz, 1080P 3D@60Hz |
| Color Space | RGB, YCbCr 4:4:4, YCbCr 4:2:2 |
| Color Depth | 10-bit, 12-bit |
| HDMI Audio (Pass-through) | LPCM 2/5.1/7.1CH, Dolby Digital, DTS 5.1, Dolby Digital+, Dolby TrueHD, DTS-HD Master Audio, Dolby Atmos, DTS:X |
| Optical Audio Formats | LPCM 2CH, Dolby Digital 2/5.1CH, DTS 2/5.1CH |
| L/R Audio Formats | Analog Stereo 2CH |
| ESD Protection | ±8kV (air-gap) & ±4kV (contact) |
| Connections | |
| Inputs | 1× HDMI Type A [19-pin female] |
| Outputs | 1× HDMI Type A, 1× Optical [S/PDIF], 1× L/R Audio [RCA] |
| Mechanical | |
| Housing | Metal Enclosure |
| Dimensions | 73.5mm (W) × 60.7mm (D) × 20mm (H) |
| Weight | 135g |
| Power Supply | AC 100–240V 50/60Hz; DC 5V/1A (CE/FCC/UL) |
| Power Consumption | 1.25W (Max) |
| Operating Temp | 32–104°F / 0–40°C |
| Storage Temp | -4–140°F / -20–60°C |
| Relative Humidity | 20–90% RH (no condensation) |
| Package Contents | |
| 1× | HDMI 18Gbps Audio Extractor |
| 1× | 5V/1A Power Adapter |
| 1× | User Manual |
What EDID and audio capability does the 2CH analog/coax output report to the source?
HDMI output passes full Dolby Atmos bitstream through while the 2CH analog/coax output simultaneously outputs decoded PCM stereo. On the 2CH path, if TV EDID copy is disabled, EDID is capped at 1080p with 2CH PCM audio; if a TV is connected, it adopts the TV's EDID but audio stays capped at PCM 2.0.
How is this different from the HAECOAX3?
The HAECOAX3 is a pass-through extractor — it strips audio from HDMI but does not decode or down-mix. The AUD-DCODEHDMI-4K adds real-time Dolby/DTS decode and down-mixes multichannel bitstream to 2CH analog stereo.
Does it support DTS:X or DTS-HD Master Audio?
DTS:X and DTS-HD Master Audio are passed through on the HDMI output. The optical output supports standard DTS up to 5.1CH. The 2CH mode decodes DTS bitstream to analog stereo.
Can I use this with a soundbar that only has optical input?
Yes. Connect source to HDMI IN, display to HDMI OUT, and run a TOSLINK cable from OPTICAL OUT to the soundbar. Set the switch to Bitstream for up to 5.1CH Dolby Digital or DTS on optical.
Does this decode Dolby Atmos to stereo?
Dolby Atmos is passed through on the HDMI output. The optical output supports Dolby Digital up to 5.1CH. The analog L/R output receives a down-mixed 2CH stereo signal from Dolby or DTS bitstreams when the switch is set to 2CH mode.
What cables do I need?
One HDMI cable from source to HDMI IN, one HDMI cable from HDMI OUT to display, and either a TOSLINK optical cable or RCA stereo cables for audio output. All cables sold separately.
No audio from the analog L/R output when playing a Blu-ray disc?
Set the front-panel switch to 2CH. Most Blu-ray discs output Dolby/DTS bitstream which requires decoding before analog output. The 2CH mode activates the built-in decoder.
Does it support ARC or eARC?
No. This unit extracts audio from an HDMI source device. For ARC/eARC extraction from a TV, use the KanexPro AUD-DEBEDEARC-4K or AUD-DCODEARC-4K.
Will this work with a 4K projector?
Yes. The unit passes 4K60 4:4:4 HDR video through HDMI OUT while extracting audio. Compatible with any HDMI 2.0 display including projectors.
What audio formats does the optical output support?
LPCM 2CH, Dolby Digital 2CH and 5.1CH, and DTS 2CH and 5.1CH.
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