Image result for KEF Q400B
The final ingredient of your new Q system is of course the seductive Q400b subwoofer. A closed box design housing a 250mm (10in.) woofer driven by a 200W on-board Class-D amplifier, this discreet cube creates spectacular bass imagery - eloquent, musical and addictively physical. Anchoring the whole sound performance in an all-embracing sensation of immediacy, it completes the acoustic picture.
Design Closed-box subwoofer
Drive Units 1 x 250mm (10in.)
Frequency Response 28Hz - 140Hz (±3dB)
Crossover Frequencies Cross Over Frequencies
Maximum Output 110dB (SPL)
Amplifier class 200W built-in Class-D
Low pass filter Variable 40Hz - 140Hz, 4th-order
Low level signal inputs RCA phono sockets
Speaker level inputs
Power requirements 100 - 240V ac ~ 50/60Hz
Power consumption 200VA
Dimensions 335 x 330 x 330 mm (13.2 x 13.0 x 13.0 in.)
Weight 13.6kg (29.9lbs)