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Product Description
At just 14 inches square, the KEF R400b may be compact, yet it packs an incredible punch. With a reinforced and 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 and a clean, fast, powerful bass performance – perfect for any serious home theatre system.
| Model | R400b |
| Design | Powered Subwoofer (Sealed) |
| Drive Units | Bass units: LF: 2 x 225mm (9in.) |
| Frequency range (-6dB) | 26Hz - 140Hz |
| Maximum output | 111dB |
| Amplifier | 2 x 250W (500W) built-in Class-D |
| Low pass filter Variable | 40Hz - 140Hz, 4th-order |
| Low level signal inputs | RCA phono sockets |
| Internal volume | 22 litres |
| Power requirements | 100V - 120V / 220V - 240V ~ 50 / 60Hz |
| Power consumption | 600VA |
| Weight | 21.5kg (47.4lbs.) |
| Dimension (H x W x D) (with terminal & plinth) |
365 x 330 x 351 mm (14.4 x 13 x 13.8 in.) |
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