If you can feel the vibrations of music without hearing the sound, it suggests that the sound waves generated by the speaker are in a frequency range that is outside the audible range of human hearing. Sound waves are essentially variations in air pressure that our ears perceive as sound. The range of frequencies that humans can typically hear falls roughly between 20 Hz to 20,000 Hz.
However, speakers can produce sound waves at frequencies both below and above this audible range. When a speaker produces sound waves with frequencies below the audible range, typically in the infrasound range (below 20 Hz), we may not perceive them as sound but rather as vibrations that we can feel.
The reason you can feel the vibrations is that low-frequency sound waves can still propagate through the air and cause objects, including your body, to vibrate. These vibrations can be detected by your sense of touch, particularly when the sound waves are powerful or the vibrating object is in close proximity to your body.
It's worth noting that feeling the vibrations of music without hearing the sound is not a common occurrence, as most music is composed and reproduced within the audible range for human hearing. However, in certain situations or with specific audio equipment capable of producing infrasound frequencies, it is possible to feel the vibrations without perceiving the sound.