XS-57 - Image Dynamics 5"x7" 2-Way Component Speaker System Composite multi layer ceramic fiber and Rohacell cones structure External ring Neodymium Magnet Motor Structure Voice coil (Single or dual): Single | Voice coil impedance (ohms): 4 | Voice coil Diameter (inches/mm): 1.4/35.56 | Recommended Power Range (watts): 15 to 125 Mounting Diameter Tweeter(inches/mm): 1.97/50.04 | Mounting Depth Tweeter(inches/mm): .8/20.32 | Mounting Depth Midbass(inches/mm): 2.71/68.83 Power: 25-250 watts | Impedance: 4 Ohms | Sensitivity: 92dB | Frequency Response: 55Hz-25kHz | Depth: 2.7"