It means a speaker in nearly each corner of the room, projecting high-quality digital sound at you from all angles just as though you had been in a theater.
Ọ pụtara onye ọkà okwu na akụkụ ọ bụla nke ụlọ ahụ, na-atụgharị ụda dị elu dị elu site n'aka gị n'akụkụ dịka ọ bụ na ị nọ na ihe nkiri.