Kef HTB2SE

So gorgeous: HTB2 is a subwoofer at this price level that you will want to show off!

Ultra-reliable high efficiency 250W class D amplifier. Plays very loud and clean all day long, if necessary.
250mm (10in.) driver with matching passive bass radiator. This configuration ensures that the surprisingly small enclosure reaches down to give astonishing deep bass, and can deliver both awesome movie effects and subtle musicality, as needed.
Flexible positioning. Depending on your space requirement or your visual preference, vertical or horizontal orientation is possible.
Acoustically inert enclosure shaped to eliminate internal standing waves. In a nutshell, no nasty buzzes or rattles when driven hard.
SmartBass™ 'connect and go' feature for simplicity of set up. Kef's engineers have carefully designed HTB2SE to be as simple and practical as possible; just connect it to the mains and your AV receiver to be assured of optimum performance without the hassle of "tweaking".

Specifications
Design Powered Subwoofer
Passive radiator
Drive unit array 1 x 250mm (10in.)
1 x 250mm (10in.) ABR
Frequency range 30Hz - 250Hz
Amplifier Requirements 250 W built in
Sensitivity (2.83V/1m) 100mV for full Output
Maximum output 110dB SPL @ 1m
Internal volume 15 litres
Weight 11.3kg (24.9lbs)
Dimensions
(H x W x D) vertical:
390 x 440 x 195 mm
15.4 x 17.3 x 7.7 in.

horizontal:
227 x 440 x 385 mm
8.9 x 17.3 x 7.7 in.
Finishes High Gloss Black or High Gloss Silver