Driver:2.5″ x 4 excellent full range speaker Frequency Response: 100Hz-20,000Hz Sensitivity(1m,1W): 90dB Speaker Dimensions: 450x105x95mm(HxWxD) Material: Aluminum Impendance: 8 Ohms Transformer:12w-6w-3w-1.5w-8Ω(100Vor 70V)