Driver:Woofer 5.25″ +Tweeter 0.5″+Piezo 1″ Frequency Response: 50Hz-20,000Hz Sensitivity(1m,1W): 89dB Speaker Dimensions: 240x178x193mm(HxWxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:16w-8w-4w-2w-8Ω(100Vor 70V)