Medley Pebble 2 – Low Volume Issue (Firmware Update) – Avantree Support

Volume Still Too Low? Try These Steps First

If your Medley Pebble 2 is working but the sound is too quiet, try these checks before updating the firmware.

Step 1 – Turn Up the Earbud Volume

Start playing TV audio.
Tap Volume + gradually to raise the volume. Do not press and hold the button.

Still too quiet? Continue to Step 2.

Step 2 – Check the TV or Source Volume

Your TV or connected device may also control the volume.

Using AUX?

Turn up the TV volume.

If you use a cable box or streaming device, turn up its volume too.

Using Optical (OPT)?

The TV volume may be fixed. This is normal. Continue to Step 3.

Step 3 – Try Another TV Program

Some programs may simply have quieter audio.

Try another:

TV channel
Streaming app
Movie or video

Other programs are louder? Your Medley Pebble 2 is likely working normally.

Everything is still too quiet? Continue to Step 4.

Step 4 – Recheck the TV Sound Settings

If you are using Optical (OPT), recheck these settings:

Open the TV's Sound / Audio Settings.
Set Sound Output to Optical.
Set Digital Audio Format to PCM.
Play the TV again.

PCM is a TV audio format that the Medley Pebble 2 can receive correctly.

Step 5 – Using Optical? Turn On Volume Boost

Use Volume Boost only as the last volume adjustment.

Turn on Volume Boost only if the sound is still too low after all other available volume controls have been increased to the maximum level.

Look at the back of the transmitter and find the Volume Boost button.
Press Volume Boost once.
Play the TV and listen again.

Solid White — Volume Boost is ON

Important: Volume Boost works with the Optical (OPT) input. It may cause audio distortion or reduce sound clarity.

Still Too Quiet? Get an Additional 8 dB with a Firmware Update

If Steps 1–5 have not provided enough volume, update your Medley Pebble 2 transmitter using the official DFU page below. The new firmware can increase the volume by a further 8 dB.

Update from the Official DFU Page

Have your Medley Pebble 2 transmitter, a Windows PC or Mac, an internet connection, and a USB data cable ready.

Open Medley Pebble 2 Firmware Update

Open the DFU page above on your computer and follow its instructions to install or open the Avantree Firmware Updater.
Connect the transmitter base directly to the computer with a USB data cable.
Follow the update instructions to install the latest available transmitter firmware.
Keep the transmitter connected until the updater confirms completion. Follow any reset instructions provided on the DFU page or in the updater.

Use a data-capable USB cable. A charging-only cable will not allow the computer to detect the transmitter.

Reconnect and Check the Volume

After the update finishes, disconnect the transmitter from your computer and reconnect it to the TV.
Restart the transmitter and reconnect the earphones.
Play TV audio and raise the earphone volume gradually from a comfortable starting level.
If using Optical and more volume is needed, check that Volume Boost is enabled on the base, as described in Step 5.

Computer Does Not Detect the Transmitter?

Unplug and reconnect the USB cable.
Try another USB port.
Try another USB data cable.
Connect directly to the computer instead of using a USB hub.
Close and reopen the Avantree Upgrade Tool.

Something Didn't Work?

No Sound?

If you cannot hear the TV at all, use the No Sound guide.

Fix No Sound

Need More Medley Pebble 2 Help?

Explore more setup and troubleshooting guides.

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Volume Still Too Low?

If the volume is still unusually low after the firmware update, contact Avantree Support.

Please tell us:

Your TV brand and model.
Whether you use Optical, AUX, or another connection.
Whether Volume Boost is ON.
Whether the firmware update completed successfully.

Contact Avantree Support