KEF R400b Subwoofer
At just 14 inches square, the KEF R400b may be compact, yet it packs an incredible punch. With a reinforced & braced sealed cabinet, the R400b houses twin 9-inch LF drivers powered by twin 250W class-D amplifiers. The drivers are mounted back-to-back, to create ‘force cancelling’. This means the opposing reactive forces are nullified, resulting in no cabinet agitation & a clean, fast, powerful bass performance – perfect for any serious home theatre system.
Model R400b
Design Powered Subwoofer (Sealed)
Frequency range (-6d B) 26 Hz
- 140 Hz
Maximum output 111d B
Amplifier 2 x 250W (500W)
built-in Class-D
Low pass filter Variable 40 Hz
- 140 Hz, 4th-order
Low level signal inputs RCA phono sockets