Driver:Woofer 8″ + Medium 2.5″ + Tweeter 1″ Frequency Response: 35Hz-20,000Hz Sensitivity(1m,1W): 90dB Speaker Dimensions: 370x270x95mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:30w-20w-10w-5w-8Ω(100Vor 70V)