KEF Q400


The final ingredient of the Q system is the seductive Q400b subwoofer. A closed box design housing a 250mm (10″) woofer driven by a 200W Class-D amplifier.

Mainly for Music but it will work just as good for movies

33 in stock


Advanced bass technologies

Deeper, tighter and more accurate bass.

Featuring rigid new aluminium cone technology just like the Uni-Q array, the Q Series advanced bass driver is a tour de force in its own right. A die-cast aluminium chassis rigidly locates the high efficiency vented magnet assembly to prevent unwanted resonance, and the large (50mm) voice coil ensures impressive power handling. Its musicality is impeccable: seductively tuneful and well controlled, and on the floorstanding models, complemented by dedicated front-firing auxiliary bass radiators (ABRs).




Front Firing Closed box

Driver Size

250mm (10in.)



Lower Frequency Response

40Hz – 140Hz


335 x 330 x 330 mm (13.2 x 13.0 x 13.0 in.)



Movies / Music

40 / 60

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