Subwoofer KEF Reference M208/2

Design Bass reflex, magnetically shielded
Drive Units 1 x 300mm (12in.) long-throw LF
Sensitivity (2.83V/1m) Active System
Frequency Response (+/-3dB) 25Hz – 200Hz
Maximum Output 117dB
Amplifier Requirements 500W built in
Magnetic Shielding Yes
Impedance Active System
Bass Extension 22Hz (-6dB)