Picture of the WPC button on the Sony SRS XB21 speaker.

Sony SRS XB21 WPC Button Explained

This WPC  button on the Sony SRS XB21 Bluetooth speaker lets you join from two to a hundred compatible speakers together, such that they all play the same program. Why do this?  Because, as with the Connect Plus and Party Boost feature on JBL speakers, you get a wider coverage area when you have more than one Sony speaker in sync, than when just one is playing. So you get more volume to spread around bigger party areas. So in this piece, we explain how to use this button.

The Wireless Party Chain (WPC) Button Explained

Picture of the WPC button..
The WPC button.

How to Set Up WPC Mode

Now to create a party group, you can use any combination of XB20, XB21, XB30, XB31, XB40, and XB41 models. Furthermore, the GTK-XB60, GTK-XB90 Sony models work here as well.  Now In WPC mode, unlike with stereo pairing, you can indeed mix and match different speaker models, so long as you do it with only the models listed here.

To form a WPC group of speakers, do as follows.

Get the Speakers Together
    1. Position all speakers you wish to add within 3.2 feet, or 1 meter, of your phone or tablet from which you’ll be playing the music.
Start WPC Mode on Speaker One
    1. Power up the first speaker.  We’ll call this one  Speaker One.
    2. Pair Speaker One with your source Bluetooth device.
    3. Briefly press the WPC button on Speaker One. The speaker then beeps and the  WPC (Wireless Party Chain) light then starts blinking. E.g. See this light in the next picture below. Finally after a few seconds, this lamp stops flashing, and begins glowing solid white.
Picture of the glowing WPC lamp on the Sony SRS XB21 speaker.
The glowing WPC lamp on the Sony SRS XB21 speaker.
Start WPC Mode on Speaker Two
    1. Next, turn on the second speaker.  I.e. Speaker Two.
    2. As you did on Speaker One, briefly press the WPC button on Speaker Two.  The WPC light begins flashing on that speaker for a short time and a low-high beep is heard. Then the lamp glows steadily. Also, the Bluetooth lamp on Speaker Two goes dark. At this point, you have successfully created a WPC  link between these two speakers. Note that once you initiate WPC on Speaker One, you have just one minute to complete the connection on Speaker Two.  If you do not, the waiting Speaker One times out, and returns to normal single-speaker Bluetooth operation.
    3. Finally, once you connect to the new WPC group, you can start playing music on that device. Then it will stream to that speaker group, and you’ll hear the program on both speakers.
    4. Now to add other speakers to the group, repeat steps 1 through 2 on the speaker you’re adding.

How to End WPC Mode

When you’re ready to break the WPC link, simply press and hold the WPC button on Speaker One for three seconds.  A tone then sounds and the WPC light goes out, meaning that the link is now broken.

The dark (OFF) WPC light. Sony SRS XB21 Buttons Explained.
The WPC lamp OFF (dark).

Then simply turn off the speakers that you’ll no longer be using.

Other Posts About the Sony SRS XB21

    1. Sony SRS XB21 Add Button Explained
    2. How to Connect to Sony SRS XB21 Speaker
    3. Sony SRS XB21 Pairing Two Speakers
    4. Sony SRS XB21 Buttons Explained
    5. How to Bass Boost Sony SRS XB21 Speaker

References for Sony SRS XB21 WPC Button

    1. Sony SRS XB21 Support Page at Sony.com

Revision History

    • 2022-10-10: First published.