If you place your soundbar on a shelf inside a cabinet, then it should come forward as much as possible so that it does not obstruct sound directed to the sides.
Ọ bụrụ na ị na-etinye ụda ụda na shelf n'ime ụlọ kaadị, tinye ya dịka o kwere mee ka e wee ghara ịdọrọ ụda nke ọma n'akụkụ n'akụkụ.