Personi-Fi 2.0 is a new feature available through the JBL Headphones App. This feature helps to personalize the sound using the best possible sound curve based on your hearing capabilities. It will first ask a few questions, and then check your current ambient audio. You will be informed that this step should be completed in a quiet environment. It will play a series of test tones in all the different frequencies wherein after each frequency test tone is played, it will ask you what is the lowest volume setting you can hear. Nine different sounds will be played in each ear (18 in total).

Simply press and release the button when you hear a sound. After it goes through all the test tones, it then calculates the best sound for your ears based on the results. It allows you to demo the results by playing a track. You will be able to toggle it on/off to hear the difference.