Unfortunately, the usual way of how to turn on bass boost on the JBL Charge 5 speaker does not work. Further, we know of no other way to activate this mode. But you could simulate it by adjusting an equalizer app on your streaming source device. Hopefully, JBL will add this feature in a later version of the firmware.
But if this did work, it might operate as follows, just as it has on other JBL Charge speakers.
Now when ON, this mode would make the passive bass radiators vibrate noticeably more. Moreover, extra bass mode would add a decidedly “thumpy” aspect to the content playing. This could make this speaker sound much bigger than it really is.
JBL Charge 5 Bass Boost, Step by Step
First off, by default, this BT speaker would have this super bass mode turned on. Moreover, if this toggling actually worked, then it would also add more treble as well as extra bass as well.

How to Turn On JBL Charge 5 Bass Boost
Some day, we hope that you’ll be able to turn this extra bass mode ON by pressing and holding in the Volume Down (-) and Bluetooth buttons for about ten seconds. Plus, you would keep holding them until the oval ring around the buttons lights up.
E.g. See these lights in the next picture, and find these buttons on the top of the speaker, as shown in the picture above.

Also, to reverse what you did above, then again, you would press and hold the Volume Down and Bluetooth buttons in until the oval button ring lights up once more. Then release the buttons when you see that. Finally, when the ring goes dark, bass mode would go back to what it was before.
Qualifiers
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- Speaker firmware version for this test: 0.5.2.0.
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References for How to Turn On JBL Charge 5 Bass Mode
Revision History
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- 2022-10-14: First published.