KEF R400b Speaker Subwoofer 2x 250W Class D

Dimensions | Metric :16-3/4” W x 16-3/4” D x 16-15/16” H | 42.5 x 42.5 x 43.0 cm
Driver Complement :One high-definition 14" long throw woofer, pressure coupled to two 14” low bass radiators
Frequency Response :11 Hz – 200 Hz
Internal Amplifier Power :1800 watts
Auto On / Off :Signal Sensing (US) | Signal Sensing and Switched (International)
Power Requirements :110 volts Alternating Current (US) | 220 volts Alternating Current (International)
High Level Inputs :Two pairs of 5 way binding posts
High Level Outputs :Two pairs of 5 way binding posts
Subwoofer Inputs :One LFE input (for SW preout only)
Low Level Inputs :Two low level inputs: left and right low level in
Low Level Outputs :Two low level outputs: left and right low level out
High Level High Pass Crossover :Non Variable 6 dB/octave @ 80 Hz: Available only with high level inputs and outputs only
Low Level High Pass Crossover :12 dB/octave continuously variable from 40 Hz to 150 Hz: Available only with low level inputs and outputs
Low Pass Crossover% :24 dB/octave continuously variable from 40 Hz – 150 Hz: Available only with high level inputs and outputs or low level inputs and outputs
Available Finishes :Piano-Gloss Black
Accessories :Rubber feet; Isolation spikes
Fuse :8 amp 250 volt Slo Blo (US) | 4 amp 250 volt Slo Blo (International)
Weight | Metric :97 lbs | 44.0 kg
Warranty :5 Years; 3 Years for Amplifiers

 Technical features    500W class 'D' power amplifier
Description    Active closed-box subwoofer system
Drive unit    1x f250mm (10 in) paper / Kevlar® cone long-throw
Frequency range    -6dB at 18Hz and 40/140Hz adjustable (EQ at A)
Frequency response    ±3dB 25Hz – 40/140Hz adjustable (EQ at A)
Power output:    500W
Rated power consumption:    94W
Input impedance:    33kΩ

Signal / noise:    >80dB
Functions:    Input Level (line in)

Input Level (speaker in)

Low-pass filter frequency

Low-pass filter bypass (line in only)

Bass extension

Bass roll-off alignment

Auto sense on/standby

Phase switch
Inputs:    Line In (RCA Phono)

Speaker Level In (Binding post)
Low-pass filter    Active 4th-order, variable cut-off frequency
Height:    325mm 12.8 in)
Width:    325mm (12.8 in)
Depth:    362mm (14.3 in)
Net weight    15.5kg (34.4 lb)
Cabinet    Gloss Black

AVAILABLE IN gloss black,wenge,rozenut COLORS

Amplifier Output: 1000 watts (RMS) 2000 watts (Peak)
Frequency Response: 16Hz to 40/160Hz variable
Crossover (Low Pass): 40Hz - 160Hz Variable slope characteristic from
12 - 36dB/Octave
Sub-Sonic Filter (High Pass): 16Hz - 31Hz
EQ: 4 x Presets 1 x User Setting
Equalisation: Graphic 9 band Equaliser ±6dB in 0.5dB steps
Volume Level: -80 - 0dB (1dB increments from 0 to -30dB & 2dB
increments from -31 to -80dB)
Auto Sensing Input Requirements: Line Level>5mV (RMS) Variable delay time
5, 10, 15, 20, 25 & 30 minutes
Variable Phase Control: 0. 45. 90, 135, 180, 225, 270 & 315º
Internal Memory: 3 Independent memory locations
Cabinet Specification:
Sealed Cabinet with 25mm thick M.D.F
construction with critical internal bracing
Amplifier Classification:
Class-D amplifier with DSP control
Driver Complement:
1 x 15" C-CAM long throw sub-woofer driver featuring triple suspension and a 4" long throw voice coil

External Dimensions -
Excluding Plinth: Width: 485mm (19 inches)
Height: 455mm (18 inches)
Depth: 475mm (18 3/4 inches)
Weight: 50 Kg (110lbs)
Mains input Voltage: 100 - 240 Vac 50/60Hz (Factory Set)
Trigger Input:
3.5mm Jack input, +12Vdc = On State

User's Manual

AVAILABLE IN THESE COLOR FINISHES

Outer Flange Dimensions | (Metric) :15-1/2” W x 21” H | 39.4 x 53.3 cm
Cut Out Dimensions | (Metric) :14-3/8” W x 19-7/8” H | 36.5 x.50.5 cm
Depth from Flange | Metric :3-13/16” | 9.7 cm
Driver Complement :One 10" Long-Excursion Woofer coupled to one 10" infrasonic Radiator
Frequency Response :16 Hz – 200 Hz
Impedance :4 ohms
Required Amplifier :SubAmp 600 (available separately)
Inputs :One pair of gold plated spring loaded posts
Enclosure :Sealed Medite
Available Finishes :Paintable White
Accessories :Paint mask; Cut-out template; Paintable removable all metal grill
Packaging :One to a carton
Weight | (Metric) :30 lbs | 13.6 kg

Dimensions | Metric :16-3/4” W x 16-3/4” D x 16-15/16” H | 42.5 x 42.5 x 43.0 cm
Driver Complement :One high-definition 14" long throw woofer, pressure coupled to two 14” low bass radiators
Frequency Response :11 Hz – 200 Hz
Internal Amplifier Power :1800 watts
Auto On / Off :Signal Sensing (US) | Signal Sensing and Switched (International)
Power Requirements :110 volts Alternating Current (US) | 220 volts Alternating Current (International)
High Level Inputs :Two pairs of 5 way binding posts
High Level Outputs :Two pairs of 5 way binding posts
Subwoofer Inputs :One LFE input (for SW preout only)
Low Level Inputs :Two low level inputs: left and right low level in
Low Level Outputs :Two low level outputs: left and right low level out
High Level High Pass Crossover :Non Variable 6 dB/octave @ 80 Hz: Available only with high level inputs and outputs only
Low Level High Pass Crossover :12 dB/octave continuously variable from 40 Hz to 150 Hz: Available only with low level inputs and outputs
Low Pass Crossover% :24 dB/octave continuously variable from 40 Hz – 150 Hz: Available only with high level inputs and outputs or low level inputs and outputs
Available Finishes :Piano-Gloss Black
Accessories :Rubber feet; Isolation spikes
Fuse :8 amp 250 volt Slo Blo (US) | 4 amp 250 volt Slo Blo (International)
Weight | Metric :97 lbs | 44.0 kg
Warranty :5 Years; 3 Years for Amplifiers