What's going on

The Xreal Air 2 Pro relies on DisplayPort Alternate Mode (DP Alt Mode) over USB-C to receive both 1080p video signals and digital audio streams simultaneously. Inside the frame, an onboard controller decodes the digital audio stream and routes it to the micro-directional open-ear speakers built into the left and right temple arms.

When sound suddenly stops working while the display remains active, it usually means the digital audio handshake failed at the software layer, the host device failed to assign the glasses as the active audio playback target, or physical stress on the hinge has disrupted the wiring to the temple speakers.

Symptoms people notice

• Video works, audio dead: You can see your virtual screen clearly, but the directional speakers remain completely silent.
• Host speaker playback: Sound plays out of your iPhone, ROG Ally, or MacBook speakers instead of redirecting to the glasses.
• Single-side dropouts: Sound cuts out in only the left or right arm, especially when adjusting the temple angle.
• Volume rocker non-responsive: Pressing the volume buttons on the right temple arm displays no system feedback or change in audio levels.
• Static or buzz: Low static or crackling occurs right before the audio subsystem drops off completely.

Likely causes

1. Host system audio routing: Your operating system retains default playback on built-in speakers or Bluetooth earbuds rather than routing DP Alt Mode audio over USB-C.
2. Unstable USB-C connection: The audio pins on the USB-C interface are sensitive. A slightly loose plug or contaminated port can drop the audio signal while keeping video intact.
3. Firmware state freeze: The onboard audio microcontroller inside the glasses can freeze during rapid hot-plugging or power state changes.
4. Incompatible hub/adapter: Using cheap HDMI-to-USB-C conversion cables or non-certified hubs that pass video channels but strip audio packets.
5. Hinge flex cable failure: Repeated folding of the temple arms can stress the internal Flexible Printed Circuit (FPC) ribbon, severing power or audio lines to the open-ear drivers.

Quick checks first

Before assuming your hardware is broken, check these fast fixes:

• Check Windows/Mac output options: Click your OS volume icon and explicitly select XREAL Air 2 Pro from the drop-down list.
• Unplug and flip: Disconnect the USB-C cable from the glasses, rotate the connector 180 degrees, and re-seat it firmly.
• Bypass the Xreal Beam: If using the Beam, plug directly into your phone or PC. If audio returns, the issue is with the Beam's output setting or wireless bridge.
• Test on another device: Connect to a different USB-C device supporting video out to confirm whether the problem follows the glasses or stays with the original host.

When it's a real hardware fault

If manual audio routing, cable swaps, and web firmware reflashes fail to restore sound—or if audio cuts in and out strictly when flexing the left or right temple arm—you are likely dealing with a physical hardware failure.

The most common point of failure in the Xreal AR Glasses lineup is the hinge spring mechanism. Over time, opening and closing the frames subjects the thin copper traces inside the FPC ribbon cable to mechanical metal fatigue. Once an internal trace snaps, the speaker on that side (or both sides, if ground drops out) goes silent permanently.

Soft resets vs board/panel work

Resetting the software state of the Xreal Air 2 Pro is safe and easy. Performing an official WebOTA firmware reflash or forcing a resolution/audio protocol switch via the temple rocker buttons can resolve persistent software mutes.

However, board-level repairs or temple-arm teardowns are not recommended as DIY projects. The temple arms are sealed with industrial adhesive, ultra-fine ribbon connectors, and microscopic screws. Attempting to pry open the temple arms to fix speaker wiring without specialized micro-soldering gear and replacement FPC ribbons almost always causes permanent damage to the electrochromic dimming layer or micro-OLED display ribbon cables.

Next steps

If basic troubleshooting doesn't fix your sound, visit our main smart glasses problems hub for broader signal and power guides. If you are considering replacing your pair or comparing hardware reliability across brands, check out our latest smart glasses reviews and explore detailed specs under our Xreal section.