Driver:Woofer 4″ x 4 +Tweeter 0.5″ x 2 Frequency Response: 150Hz-20,000Hz Sensitivity(1m,1W): 86dB Speaker Dimensions: 850x150x105mm(HxWxD) Material: Aluminum Impendance: 8 Ohms Transformer:30w-20w-10w-5w-8Ω(100Vor 70V)