How to Fix Sonos Arc Audio Dropouts: HDMI eARC Troubleshooting Guide

Modern home theater living room with a premium soundbar under the TV

The Sonos Arc is widely regarded as one of the best premium Dolby Atmos soundbars on the market. However, even high-end audio gear isn't immune to technical glitches. One of the most frustrating problems reported by home theater enthusiasts is sudden audio dropouts—where the sound cuts out for a few seconds, or goes completely silent while watching movies, playing video games, or streaming TV shows.

Most of these dropouts are not caused by a hardware failure in the Sonos Arc itself, but rather by HDMI eARC handshake issues, bandwidth limitations, or incorrect TV audio output settings. In this guide, we will walk you through the exact steps to troubleshoot and fix these audio dropouts once and for all.

Step 1: Perform an HDMI eARC "Handshake Reset"

HDMI eARC (Enhanced Audio Return Channel) relies on a constant, secure two-way communication (known as a "handshake") between your TV and the soundbar. If this handshake gets corrupted, audio dropouts will occur. A simple reboot won't fix this; you need to force a full HDMI reset.

How to reset the HDMI handshake:

  1. Disconnect the HDMI cable from both the TV and the Sonos Arc.
  2. Power off both the TV and the Sonos Arc completely by unplugging them from the wall outlet.
  3. Wait at least 2 full minutes to allow all residual power in the capacitors to drain.
  4. Plug the TV and the Sonos Arc back into the wall outlets.
  5. Turn on both devices.
  6. Reconnect the HDMI cable, ensuring it is plugged into the port labeled HDMI ARC or eARC on your TV.

Step 2: Check TV Audio Output Settings (Pass-Through vs. Auto)

Your TV's internal processor plays a huge role in how audio signals are sent to the soundbar. By default, many TVs are set to "Auto" or "PCM" digital audio output. This forces the TV to decode or transcode the audio signal before sending it to the Sonos Arc, which frequently causes processing delays and dropouts, especially with Dolby Atmos content.

To resolve this, navigate to your TV's Settings > Sound > Expert Settings (the menu names will vary slightly between LG, Samsung, and Sony TVs) and look for **Digital Audio Output**. Change this setting from "Auto" to Pass-Through (or "Bitstream"). This instructs the TV to send the raw, untouched audio signal directly to the Sonos Arc, letting the soundbar do the heavy lifting of decoding.

Step 3: Upgrade to a Certified Ultra High-Speed HDMI Cable

Dolby Atmos via eARC requires significant bandwidth (up to 37 Mbps) to transmit uncompressed audio. While Sonos includes an HDMI cable in the box, cables can degrade over time, bend behind tight wall mounts, or fail to meet the strict HDMI 2.1 specifications needed for eARC.

If you are using a third-party HDMI cable or a cheap generic cable, upgrade to a certified Ultra High-Speed HDMI 2.1 cable (rated for 48Gbps). Ensure it has the official "Ultra High Speed HDMI" holographic label on the packaging. A high-quality cable prevents signal attenuation and packet loss, which are prime culprits behind intermittent sound dropouts.

Step 4: Disable HDMI-CEC Conflict (Simplink/Anynet+)

HDMI-CEC allows your TV remote to control the volume of the Sonos Arc. However, if you have multiple devices connected to your TV (such as an Apple TV, PlayStation 5, or Nintendo Switch), these devices can send conflicting CEC commands, interrupting the connection to the soundbar.

Try disabling HDMI-CEC on secondary devices (like your gaming consoles or streaming sticks) while leaving it enabled on the TV. This ensures only the TV and the Sonos Arc are communicating over the CEC channel, eliminating signal interference.

A Long-Term Alternative: The Importance of Connection Stability

If you have tried all the steps above and still experience issues, it may be due to compatibility quirks between your specific TV firmware and the Sonos ecosystem. In the world of premium audio, stability is just as important as acoustic performance.

For those looking for a plug-and-play experience without the headaches of constant firmware updates, brands like Verona have focused heavily on connection stability. The Verona VN12 Ultra-Thin Soundbar, for instance, is engineered with dedicated, redundant eARC handshake protocols that prevent dropouts across a wider range of older and newer TV models. Sometimes, a simpler, more robust hardware interface is the ultimate key to a stress-free home theater experience.

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