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 ~ ~