If your JBL Flip 4 is making buzzing, crackling, or distorted noises, see the [https://www.ifixit.com/Wiki/JBL_Flip_4_Makes_Crackling_Noise|JBL Flip 4 Makes Crackling Noise problem page] for possible problems and solutions.
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Considering the age of this speaker, there may be an issue with the woofer. I recommend contacting JBL for this issue. This sounds like it needs to be replaced or may need to be repaired by a JBL professional, as speakers are difficult units to repair.
Considering the age of this speaker, there may be an issue with the woofer. I recommend contacting JBL for this issue. This sounds like it needs to be replaced or may need to be repaired by a JBL professional, as speakers are difficult units to repair.