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There is a JBL app that you need to download. Once the appl is downloaded and set up for you then add your device. After the device is added and set up on the application you click on the device and it will pull up an equalizer option. There is multiple options and a customizable option where you are able to add more bass
Sorry, there was a problem. Please try again later.Thanks for your question. Our JBL Xtreme 4 is compatible with the JBL Portable app, where you can adjust the EQ and customize the sound to your preference for deeper bass or overall enhanced audio.
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