Blue Sky Sky System One 2.1 (active) 200-watt Powered Sub System Sat 6.5 Monitor: Input Impedance 40k Ohms balanced Sat 6.5 Monitor: Common Mode Rejection Ratio 40dB typical 60Hz Woofer: 1 1/2 inch aluminum voice coil with vented motor for high power handling Woofer: Copper shorting ring for lower distortion Sub 12: Voltage Sensitivity 90dB SPL @ 100mv @ 1M