Please use strong electromagnetic waves to interfere or destroy the sound! Give it to other methods that can leave no trace! ! ! ! !

The simplest thing is to send a message or make a phone call with your mobile phone near the stereo ~ ~ ~

If you want to make equipment, it will be more difficult. You need a radio transmitter to use its electromagnetic energy to interfere with the audio amplification circuit of audio or the unshielded connection loop of external speakers (speakers) ~ ~ ~

If the distance is long, it requires power, but too much radiation is also harmful to the body. You can consider walkie-talkie equipment or car radio, with high power, adjustable frequency band and long-distance interference ~ ~