Why does the screen or back cover of the REDMI Note 14 Pro+ 5G resonate when the volume is turned up?

To deliver a superior audio experience, the REDMI Note 14 Pro+ 5G features an advanced stereo dual speaker design, engineered to produce rich, dynamic sound. When enjoying content with strong bass or deep low frequencies, you feel a slight resonance or vibration coming from the back cover of the phone. This is a normal phenomenon, caused by the low-frequency sounds produced by the speakers that resonate through the phone's body, adding to the immersive experience.
To further protect your device and minimize any vibrations or resonance, Xiaomi includes a protective case in the package. The case not only shields the phone from physical damage but also helps to dampen the vibrations caused by the bass sounds, making it more comfortable to hold and use at high volumes.