Driver:Woofer 4″ +Tweeter 2″+Piezo 1″ Frequency Response: 60Hz-20,000Hz Sensitivity(1m,1W): 89dB Speaker Dimensions: 198x150x138mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:16w-8w-4w-2w-8Ω(100Vor 70V)