Driver:Woofer 4″ +Tweeter 2″+Piezo 1″ Frequency Response: 100Hz-20,000Hz Sensitivity(1m,1W): 88dB Speaker Dimensions: 1208x138x123mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:16w-8w-4w-2w-8Ω(100Vor 70V)