OPTIMUS 6 1/2" 3-Way Speaker System (120-1734) Specifications Faxback Doc. # 17100 Speaker Size:.............................................6 1/2-inch Woofer 2-inch Mid-range 1-inch Tweeter Barium Magnet Weight:.............................................14.12 Oz. Power Handling:.........................................40 Watts Each (RMS) Maximum Power:................................................80 Watts each Impedance:...........................................................4 Ohms Frequency Response:..........................................50 Hz - 20 kHz Sensitivity:..........................................................89 dB Weight:.............................................2 LBs, 2 Oz. ( 960 gms) Dimensions:.................................41/2 x 71/8 x 71/8 inches (HWD) (114 x 181 x 181 mm) Specifications are typical; individual units might vary. Specifications are subject to change and improvement without notice.