Co bac nao ranh ve dan am thanh5.1 tu van giup em cai.la vi em moi sam dan pioneer 636 ve ma khi xem phim thi chi thay hai cai loa cay va sieu tram hoat dong.con loa trung tam va hai loa con lai im.chi khi em bam chuyen sang soun 3d thi no hoat dong nhung hai loa cay lai im.the khi nao thi ca...