The Redmi Note 13 Pro+ 5G is equipped with stereo dual speakers designed to enhance the sound quality experience. Special processing is applied to the low frequencies to achieve better audio effects. Consequently, when listening to music with pronounced low frequencies, you will feel a certain vibration in the phone's case or screen. This shell vibration is a normal occurrence and indicates the powerful performance of the speakers.
To mitigate this vibration, the phone comes with a protective case, which not only protects your device but also effectively reduces the sensation of case resonance. You can enjoy your music without worry, knowing this is a feature of the device's audio system.