KEF R 400b Subwoofer

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₹ 115,000.00

We truly believe size does not matter and so will you - after you get a first experience of the KEF R 400b Subwoofer, available online on Ooberpad. At just 14 cubic inches, the KEF R400b is compact, convenient and cavernous! Fitted 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 thereby creating a ‘force-cancelling’ effect. This means the opposing reactive forces are nullified, perfectly delivering crisp and clear bass sound - just what you want for your home theatre system!


1-year manufacturer's warranty

Key Features:

  • The R400b uses two ultra-low distortion 9 inches bass drivers, each braced with force-cancelling technology within the cabinet to allow both drive units to operate more effectively, giving greater definition to low frequencies.
  • The shape and bracing of the cabinet are computer optimized to minimize secondary radiation from the cabinet walls and distortion from standing waves.
  • Measuring a compact 14 inches deep and wide, the R400b delivers a surprisingly massive low-end with an incredibly quick response.
  • Frequency Range-26Hz - 140Hz (-6dB). Power requirements-100V - 120V / 220V - 240V, ~ 50 / 60Hz

Benefits of KEF R 400b Subwoofer:

Bass driver

The R 400 features large aluminium coils and a vented magnet that drive its strong yet lightweight hybrid cones. This combination results in a faster, cleaner and accurate bass output. Additionally, satin anodised elements contribute to R400b’s elegance and sophisticated look.


The R Series by KEF is known for its attention to detail and are true believers of the fact that a little finesse goes a long way to delivering a big impact. Features like adjustable die cast aluminium feet that support steel spikes with integrated locking knobs for easy height adjustment. Also, nickel-plated bi-wire connectors with terminal linking control allow all standard connection methods. The geometry of the reflex ports has been tuned to minimize distortion.


Designed specifically to meet the needs of serious audiophiles, the R series is fit with high-end technologies that deliver an accurate reproduction of sound that neither adds to nor subtracts from the original recording. The R Series is almost as good as the Reference Series without cutting a whole in your pocket.

Where to buy?

Buy the KEF R 400b Subwoofer online at the best price in Mumbai, Delhi, Bangalore, Chennai and all across India. Enjoy expert, prompt and courteous customer service from the Ooberpad team. We will help you choose better and will give you all the support you need to take the right buying decision in India.

Technical Specifications of KEF R 400 Subwoofer: 

Brand & Model # KEF 400b Subwoofer
Powered Subwoofer
Drive Units

Bass units: 
LF: 2 x 225mm (9in.)

Frequency Range
26Hz - 140Hz (-6dB)
Variable low pass filter
40Hz - 140Hz, 4th-order
Low level signal input
RCA phono sockets
Speaker level inputs
Maximum output


Internal volume


22 litres

Power requirements


100V - 120V / 220V - 240V
~ 50 / 60Hz

Power consumption



Recommended Amplifier Power

2 x 250W (500W) built-in Class-D

Dimensions (H x W x D)
365 x 330 x 351 mm (14.4 x 13 x 13.8 in.) with terminal & plinth

21.5kg (47.4lbs)

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