Model: SP-3115 long-distance loudspeaker Threeroad,all frequencyUnit configuration: SD15-1975A+SD72Maximum Load Power: 900 WRated Power:550 WImpedance:8 ΩSensitivity:98 dBFrequency response: 45Hz-18KHzSize: 600mm(W)×1200mm(H)×790mm(D)15mm imported best fibreboard,coated by black painting,sound perforated steel grille