Twin 9 inches driver 'force-cancelling' subwoofer
The R400b is just 14 inches high but with twin bass drivers and 500 Watts of power, it's made for serious home theatre systems.
The R400b's reinforced and braced cabinet houses twin 9 inches LF drivers powered by two 250 Watts class-D amplifiers. The drivers are mounted in a ‘force-cancelling’ arrangement for fast, powerful bass.
Bass driver
Massive, vented magnet assemblies and large aluminum voice coils drive the lightweight yet stiff, strong hybrid cones. Bass output is faster, cleaner and more accurate. Satin anodised elements contribute to the unit’s elegance, while the diameter of the trim ring accentuates a visual sophistication that belies the speaker’s awesome power.
Subwoofer
Force-cancelling drivers avoid cabinet agitation. Opposing reactive forces are nullified by rigidly mounting the low frequency drivers back-to-back.
Power
Dynamic, uncompressed and undistorted bass of heart pounding clarity envelops you, striking deep emotional chords. Your soul will awaken and the earth will move.
The Details
SPECIFICATIONS
Weight
21.5kg (47.4lbs)
Dimension (H X W X D)
365 x 330 x 351 mm (14.4 x 13 x 13.8 in.) with terminal & plinth
Design
Powered Subwoofer (Sealed)
Unit Measurement
Piece
Frequency Range
26Hz - 140Hz (-6dB)
Power Consumption
600VA
Power Requirements
100V - 120V / 220V - 240V
~ 50 / 60Hz
~ 50 / 60Hz
Low Level Signal Inputs
RCA phono sockets
Speaker level inputs
Speaker level inputs
Maximum Output
111dB
Recommended Amplifier Power
2 x 250W (500W) built-in Class-D
Variable Low Pass Filter
40Hz - 140Hz, 4th-order
Drive Units
Bass units:
LF: 2 x 225mm (9in.)
LF: 2 x 225mm (9in.)
Crossover Frequencies
400Hz, 2.9kHz
KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE.
AWARDS & REVIEWS
SUBWOOFER HIGHLY COMMENDED OVER $2,000
Sound+Image Awards 2013 — 2012
HOME THEATER TOP PICKS
Home Theater — 2012