Picture of the infinity button (PartyBoost button) on the JBL Boombox 2 speaker.

JBL Boombox 2 PartyBoost Button Explained

The JBL Boombox 2 speaker has several buttons and lamps across its top and front panels, and one of these the PartyBoost button.  Here, we explain the function of this (A.K.A Infinity) button, what it does, and how to use it. In short, this control lets you join from two to over a hundred PartyBoost compatible JBL speakers together, such that they all play the same program material.  Thus, you can fill a much bigger party area with sound than you can by playing just one speaker.  Further, since you can place the units as far apart as is common for Bluetooth speakers, then the area you can cover with them is large enough for most small to medium sized parties.

JBL Boombox 2 PartyBoost Button Details

Use the PartyBoost button to connect two or more JBL PartyBoost compatible speakers together, in “party mode”, including the Boombox 2. Thus, when you sync them in this way, they all play the same program without any echoes or delays.  PartyBoost mode is like Amazon’s multi room music groups.  That is, all speakers that join in play the same audio at the same time.

Then, with each speaker running, you press the PartyBoost button on each JBL speaker you wish to add to the group.

The PartyBoost button on the JBL Boombox 2 is appears like an infinity symbol, thus its name, as we see in the next picture, pointed at by the green arrow.

Picture of the PartyBoost button on the speaker.
The PartyBoost button on the speaker.

How to Use the PartyBoost Button on the JBL Boombox 2 Speaker

Note that you can mix and match any combination of JBL speakers in this joined group, so long as they all support the PartyBoost protocol.  Most of the latest speakers from the Flip, Charge, Xtreme, and Boombox series models will work together as we describe next.

  1. Place all speakers within a few feet of each other.
  2. Power up and pair the first (master) speaker to your Bluetooth source device.
  3. Next, power up each additional (slave) BT speaker that you wish to sync with the master.
  4. Press and release the PartyBoost button on the master speaker. The oval ring around the buttons on the Boombox 2 should then light up.
  5. Then press and release the PartyBoost button on each slave speaker in turn.  Again, this button or oval ring will start glowing on each speaker, depending on speaker model.
  6. Now when you play something on your Bluetooth source device, you will hear it on all speakers that you put in the group.
  7. Finally, you can break the connection between the speakers by pressing and releasing the Infinity button on the “master” speaker. Or, if you want to keep the group going but only with to remove certain slave speakers, then just turn off those speakers. The rest of the group will still continue playing.

Related Posts to JBL Boombox 2 PartyBoost Button

  1. JBL Xtreme 3 PartyBoost Button Explained
  2. The PartyBoost Button on JBL Flip 6 Explained
  3. JBL Flip 5 PartyBoost Button Explained

Other Posts About the JBL Boombox 2

  1. JBL Boombox 2 Bluetooth Pairing Instructions
  2. How to Factory Reset JBL Boombox 2
  3. How to Fix Not Charging Problem on the JBL Boombox 2 Speaker
  4. How to Turn On JBL Boombox 2 Bass Mode
  5. Low Frequency Mode Explained for the JBL Boombox 2


  1. Official JBL Boombox 2 Product Page at JBL.COM

Revision History

  • 2022-08-12: First published.