Driver:Woofer 4″ x 2 +Tweeter 1″ Frequency Response: 70Hz-20,000Hz Sensitivity(1m,1W): 90dB Speaker Dimensions: 140x380x265mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer: 40w-20w-10w-5w-2.5w-8Ω(100Vor 70V)