Technology really allows each passenger in vehicle to experience music of his/her own choice without a headphone.
Hyundai has showcased a new Separate Sound Zone (SSZ) audio system technology that promises to take the music listening experience in cars to a new level. The technology allows each passenger in the vehicle to experience music of his/her own choice without a headphone! This tech also enables passengers to attend phone calls and listen to vehicle alerts privately.
source : Deccan chronicle