Driver:Kevlar woofer 5″ +Tweeter 1″ Frequency Response: 55Hz-20,000Hz Sensitivity(1m,1W): 88dB Speaker Dimensions: 237x170x70mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:16w-8w-4w-8Ω(100Vor 70V)