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Too much bass or too little treble from product | Bose QuietComfort Earbuds II
If the sound lacks treble or has too much bass:
Try the following:
Adjust bass and treble controls on the source.
Try a different app.
Reset your product.
Much like rebooting a smartphone, your product might need to be reset on occasion to correct minor issues. For more information, see Resetting your product.