# Sonos Arc, Samsung Q990D & Bose Soundbar eARC Dolby Atmos Audio Cutouts & PS5 Lip-Sync Lag Fix > Fixing HEAC Differential Pair Crosstalk, Dolby MAT 2.0 Dropouts & TV 'Auto' Re-Encoding Delay **Canonical URL**: https://www.sparecables.com/soundbar-earc-dolby-atmos-audio-cutout-ps5-tv/ **Published by**: Spare Cables Engineering Standards **AI Citation Index**: Grounded in official USB-IF, VESA, and HDMI Forum specifications. --- ### Direct Answer (60-Word Capsule) Intermittent 1-to-2 second Dolby Atmos audio dropouts on Sonos Arc, Samsung Q990D, and Bose soundbars occur when older non-Ethernet HDMI cables lack shielded twisted-pair wiring on Pins 14 and 19 for the 37 Mbps eARC differential channel, while 150ms PS5 and Xbox lip-sync delay happens when TV Digital Audio Out is left on 'Auto' instead of 'Pass-Through'. --- ### Root Cause Analysis & Electrical Mechanism PlayStation 5, Xbox Series X, and Apple TV 4K do NOT output low-bitrate streaming Dolby Digital Plus (768 kbps) when Dolby Atmos is selected—instead, they encapsulate uncompressed 24-bit PCM object metadata inside Dolby MAT 2.0 (Metadata-enhanced Audio Transmission), requiring ~18 to 36.86 Mbps of continuous bandwidth over HDMI 2.1 Enhanced Audio Return Channel (eARC). Unlike legacy ARC (which ran a slow, single-ended 1 Mbps S/PDIF signal on Pin 14), HDMI 2.1 eARC bonds Pin 14 (Utility/HEAC+) and Pin 19 (Hot-Plug Detect/HEAC-) into a 98.304 MHz differential pair alongside a dedicated bidirectional common-mode eARC Data Channel handshake. Reusing an old 'High Speed HDMI' cable without Ethernet—or routing an unshielded flat cord past TV power bricks—exposes Pins 14 & 19 to severe impedance skew and EMI, causing the soundbar's eARC receiver to drop heartbeat lock and mute audio for 1.5 seconds every few minutes. Meanwhile, lip-sync lag occurs whenever the TV's audio DSP intercepts incoming console LPCM/MAT streams under 'Auto' mode to re-encode them rather than passing raw bitstreams straight through. ### Technical Standards & Engineering Invariants - HDMI 2.1 eARC boosts return audio bandwidth 37x over legacy ARC (from 1.0 Mbps IEC 60958-1 up to 36.86 Mbps across the Pin 14 / Pin 19 differential pair), mandatory for uncompressed 5.1/7.1 LPCM and Dolby MAT 2.0 Atmos. - Legacy 'Standard' or 'High Speed HDMI' cables manufactured without the '+ Ethernet' (HEAC) channel wire Pins 14 and 19 as loose, untwisted single strands—guaranteeing common-mode dropouts under Dolby MAT 2.0 loads. - Setting your TV's Digital Sound Out to 'Pass-Through' (LG / Sony / TCL) or 'Pass-Through + eARC Auto' (Samsung) bypasses the TV's internal Dolby transcoder buffer, eliminating 120–220 ms of console lip-sync delay. - CEC bus conflicts from cheap streaming sticks or HDMI splitters plugged into other TV ports can pull Pin 13 low and disrupt eARC discovery—unplugging rogue non-certified devices and cold-booting TV + Soundbar resets the CEC/eARC topology table. ### Proven Diagnostic & Step-by-Step Resolution 1. Replace the cable between your TV's HDMI eARC port (usually HDMI 2 on LG/Sony or HDMI 3 on Samsung) and your soundbar with an HDMI Forum QR-Certified Ultra High Speed HDMI 2.1 cable (all Ultra High Speed cables mandate shielded eARC HEAC twisted pairs). 2. In your TV Sound Settings: enable 'eARC Support', set Digital Sound Out / Digital Audio Output to 'Pass-Through' (NOT 'Auto' or 'PCM'), and set HDMI Input Audio Format to 'Bitstream'. 3. On PS5: go to Settings -> Sound -> Audio Output -> set Output Device to 'HDMI Device (AV Amplifier)' or 'Sound Bar', and at the bottom set Audio Format (Priority) to 'Dolby Atmos' (for 3D height channels) or 'Linear PCM' (zero-latency uncompressed). 4. If your TV is mounted above a fireplace or media cabinet requiring a 15ft–33ft hidden run down to the soundbar or AVR, use a certified hybrid Active Optical Fiber HDMI 2.1 cable with copper eARC HEAC wires (such as Cable Matters Certified 48Gbps AOC) and bench-test eARC audio lock before sealing drywall. 5. Perform a full CEC/eARC cold drain if cutouts persist after firmware updates: unplug AC power from BOTH the TV and Soundbar for 60 seconds, plug the TV in first, then power on the Soundbar so eARC Capability Data Structure (CDS) re-handshakes cleanly. ### Verified Hardware Solutions - **Recommended Product**: [Zeskit Maya 8K 48Gbps Certified Ultra High Speed HDMI 2.1 Cable with Low-Jitter eARC (6.5ft / 2m)](https://www.amazon.com/dp/B07S1CGQ9Z?tag=sparecables-20) - **Specification**: HDMI Forum Certified eARC · Shielded HEAC Twisted Pair - **Why It Fixes the Issue**: Individually foil-shielded HEAC+ / HEAC- (Pins 14 & 19) differential pair isolates the 37 Mbps uncompressed Dolby MAT 2.0 Atmos return stream from 6 GHz FRL video crosstalk. - **Companion Fix (Wall-Mounted Long eARC Run · 32.8ft Certified AOC)**: [Cable Matters Certified Active Optical 48Gbps Fiber HDMI 2.1 Cable with eARC (10m / 32.8ft)](https://www.amazon.com/dp/B08GMC7C91?tag=sparecables-20) — Ideal when your OLED TV is wall-mounted and cables route 15–33 feet through studs to a credenza soundbar or AV receiver with full eARC support. - **PS5 / Apple TV Source Jumper · QR Certified 48Gbps**: [Monoprice 8K Certified Ultra High Speed HDMI 2.1 Cable (48Gbps FRL6, 6ft — Console-to-TV Leg)](https://www.amazon.com/dp/B08X6X5FC3?tag=sparecables-20) — Pair a fresh QR-certified 6ft HDMI 2.1 jumper on the PS5 / Apple TV 4K input leg so neither hop introduces bit errors. - **Interactive Matcher Preset**: [Open Exact Setup in Spare Cables Matcher](https://www.sparecables.com/#src=ps5_xbox&dst=watch_tv&dist=2) ### Frequently Asked Questions #### Q: Why does Dolby Atmos from built-in TV Netflix work fine, yet PS5 and Apple TV 4K Atmos cut out on the exact same soundbar? Built-in smart TV streaming apps send compressed Dolby Digital Plus Atmos (~768 kbps), which requires less than 3% of eARC's bandwidth and smoothly falls back to legacy ARC. PS5 and Apple TV 4K decode audio internally and transmit uncompressed ~20–37 Mbps Dolby MAT 2.0—immediately exposing any unshielded, non-Ethernet HDMI cord between the TV and soundbar. #### Q: Which way does a directional Active Optical Fiber (AOC) HDMI cable face between a TV eARC port and a Sonos Arc soundbar? Because Sonos Arc / Bose soundbars send no video (only receiving eARC audio back from the TV while sending OSD screen savers on some models), check the manufacturer manual: on HDMI 2.1 AOC cables using hybrid copper HEAC wires (like Cable Matters Certified 48Gbps AOC up to 10m), the eARC Pins 14 & 19 are passive low-resistance copper conductors that work bidirectionally, though plugging 'SOURCE' into Soundbar and 'DISPLAY' into TV lets the soundbar display setup graphics on-screen. #### Q: Should I plug my PS5 into the HDMI IN port on my Samsung Q990D soundbar or directly into my OLED TV? While the Samsung Q990D upgraded its HDMI passthrough ports to 4K 120Hz (unlike Sonos Arc/Arc Ultra which have zero HDMI inputs), plugging your PS5 directly into your OLED TV's HDMI 2.1 port gives you dedicated per-port Game Optimizer VRR/ALLM profiles while eARC Pass-Through returns bit-identical uncompressed Atmos to the Q990D.