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? Update the Firmware

If Steps 1–5 did not help, follow the firmware update below.

Before You Start

Have these ready:

Medley Pebble 2 transmitter
Windows PC or Mac
USB data cable
Internet connection

Important: Use a USB cable that supports data transfer. A charging-only cable may power the transmitter but the computer may not detect it.

1. Download the Firmware File

Download the Medley Pebble 2 firmware file and save it somewhere easy to find, such as your Downloads folder.

Download Firmware File

2. Install the Avantree Upgrade Tool

Choose the button that matches your computer.

Windows PC

Download for Windows

Mac

Download for macOS

Install the Avantree Upgrade Tool, then open it.

3. Connect the Transmitter

Connect the Medley Pebble 2 transmitter directly to your computer using the USB data cable.
Wait a few seconds.

The Avantree Upgrade Tool should now detect the transmitter.

4. Select the Firmware File

In the Avantree Upgrade Tool, select Manual Update.
Find the firmware file you downloaded in Step 1.
Select the file to begin the update.

5. Wait for the Update to Finish

Follow the instructions shown in the Avantree Upgrade Tool.

Do not unplug the transmitter while the update is running.

Wait until the program confirms that the update is complete.

6. Reconnect and Test

Disconnect the transmitter from the computer.
Connect it back to your TV.
Restart the transmitter.
Reconnect the earbuds.
Play TV audio.
Tap Volume + gradually and check the volume again.

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