Driver:Kevlar woofer 6.5″ +Tweeter 1″ Frequency Response: 45Hz-20,000Hz Sensitivity(1m,1W): 89dB Speaker Dimensions: 344x236x85mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:20w-10w-5w-8Ω(100Vor 70V)