FAMILY THEATER SYSTEM - Front (2pcs) /Center (1pcs) /surround speaker (2pcs)PASSIVE SUBWOOFER (6unit/set) - Impedance: 4ohm/4ohm/8ohm/4ohm - Power Handling: 20-80W/10-40W/10-20W/30-100W - Frequency Response: 70-20,000Hz/100-20,000Hz/100-20,000Hz/40-500Hz - Sensitivity: 87dB/87dB/86dB/87dB - Speaker unit: 1" + 6.5" x 2/FRONT SPEAKER 1"+4"x2 /CENTER SPEAKER/ 1"+4"x2/SURROUND SPEAKER/ 10" /SUBWOOFER CARTON DIMENSION: FRONT SPEAKER:474x354x1070MM/PACK(1pack /set) C&SSPEAKER:550x328x193mm/pack(1PACK/SET) SUBWOOFER:390x367x421MM/PACK(1PACK/SET)