Driver:Woofer 8″ Frequency Response: 40Hz-20,000Hz Sensitivity(1m,1W): 87dB Speaker Dimensions: 328x66mm(φxD) Material: Metal Impendance: 8 Ohms Transformer:5w-2.5w-1.5w-0.63w-0.32w-8Ω(70V & 25V)