Please check how the earphones fit, because it's necessary to fit earphones appropriately because it's the elements for best Sound Quality. Then, you can customize the sound using the Technics Audio Connect app, such as 4 Preset Sound mode and Equalizer setting.
At first, please check the fit which is appropriate for your ears. And some of Android device cannot change volume. Please try to change by earphone volume by touch sensor. And also, if you're an iPhone user, please check "Reduce Loud Sounds" setting at "Headphone Safety" in "Setting" menu.
Please chose and set best earpiece for you from 7 types and check the direction of "Technics" Logo and fit earphones firmly. And then, make sure the surface of earphones should not face down.
Wear the earphones correctly to achieve good noise cancelling and acoustics.
Please check the fit which is appropriate for your ears and then, you can optimize the Noise Cancelling function by operating the "Optimizing noise cancellation" in the Technics Audio Connect app.
1. Fit the earphones firmly as per the illustration.
What the Technics Audio Connect app does to suppress sound interruptions and delays is changing the buffer size. Longer buffers size can suppress the interruption and shorter buffers can reduce delay.
EAH-AZ60M2
When the earphones are paired with a smartphone and a PC and a call is being made on the smartphone, if a notification is sent to the PC, the sound of the call may be interrupted. In that case, please select Headphones(Stereo) instead of Headset(Hands-Free) in the Sound profile setting of the PC as shown below.
After placing once into the charging cradle and waiting for about 15 seconds, take them out again.