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KEF R400b Subwoofer
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 ʽforce cancellingʼ. 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
Speaker level inputs | 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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System Format: Sealed Cabinet. 25mm M.D.F construction with internal bracing. Sealed amplifier compartment Low Frequency Limit: 18 Hz Upper Frequency Limit: 40 - 120 Hz Variable Low Pass Filter Alignment: Active 4th order 24dB/octave (6/12/18/24 dB user adjustable) Amplifier Power Output 650 watts Continuous. 1200 watts (peak) Amplifier Classification D2AudioTM* DSP controlled, Class-D amplifier system. High current switch mode power supply (smpsu) Equalisation 4 Settings (Off/Music/Movie/Impact) Phase Control 0-90-180-270 degrees Auto Sensing Input Level Requirements Line Level > 2mV. Standby after 10 minutes if no signal sensed Digital Volume Level -60 to +10dB in 1dB increments Drive Unit Complement 1 x 15” C-CAM® sub-woofer driver featuring triple suspension 3” long throw voice coil 12V Trigger Input 3.5mm mono jack socket Connections Stereo RCA in/out LFE in/out 12V Trigger in (3.5mm mono jack) LEO* - 3.5mm Microphone input jack (microphone supplied) Input Impedance 20 kohms Dimensions (H x W x D) 430 x 400 x 400 mm (16 15/16 x 15 3/4 x 15 3/4 Inches) Grille Depth 28 mm (1 1/8 Inches) Weight (unpacked) 35.3 kg (77.6 lbs) Mains Input Voltage 100 - 120 Vac / 220 - 240 Vac 50/60 Hz (Factory preset) Electrical Certifications CE/CB/ETL/Fcc/ErP (Energy saving compliant) Power Consumption Maximum 1000W. Standby Fuse Type 20mm UL/VDE (Value is region specific) IR Remote Control Code NEC SH6122 AVAILABLE IN SIX COLOR FINISHES
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Pressure vessel enclosure
500W ICEpower® amplifier
Switch mode power supply
Description Active closed-box subwoofer system
Drive unit 2x f200mm (8 in) mica / aluminium diaphragm long-throw
Frequency range -6dB at 18Hz and 40/140Hz adjustable (EQ at i)
Frequency response ±3dB 21Hz – 31/110Hz adjustable (EQ at i)
Power output: 500W
Rated power consumption: 110W (105W - 100V version)
Input impedance: 100kΩ
Signal / noise: >90dB
Functions: Volume level
Low-pass filter frequency
Bass roll-off alignment
Auto sense on/standby
Phase switch
Inputs: Line In (RCA Phono)
Speaker Level In (FCC68 4/4)
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The ASW610 subwoofer presents a very happy medium between the more diminutive ASW608 and the all-out power of the ASW610XP. Its long-throw 250mm driver allows the ASW610 to move the large volumes of air needed for high-quality low-frequency output, and its audiophile-standard 200W Class D amplifier keeps the compact unit running cool, even when the music or movie action is whipping up a storm.
In all of the 600 Series subwoofers, the bass driver diaphragms are constructed from a rugged, finely-tuned mix of paper pulp, Kevlar® fibres and resin, which provides the stiffness needed to withstand the tremendous physical forces exerted by the voice coil and pressures inside the cabinet.
Ultra-solid construction delivers slamming bass, drum kicks, and special movie effects. Deformation is minimised; bass precision, power and enjoyment are maximised.
Description | Active closed-box subwoofer system |
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Drive unit | ø250mm (10 in) paper/Kevlar® cone long-throw | Frequency range | -6dB at 20Hz and 25/140Hz adjustable (EQ at A) | Frequency response | ±3dB 27Hz – 40/140Hz adjustable (EQ at A) | Bass Extension | -6dB at 20Hz (position A) |
| -6dB at 25Hz (position B) |
| -6dB at 30Hz (position C) | Amplifier |
| Power output: | 200W | Rated power consumption: | 40W / 0.5W standby | Input impedance: | 33kΩ | Signal / noise: | >90dB | Functions: | Input level (line in) |
| Input level (speaker in) |
| Low-pass filter frequency (line in only) |
| Low-pass filter bypass |
| Bass extension |
| Bass roll-off alignment |
| Auto sense on/standby |
| Phase switch | Inputs: | Line In (RCA Phono) |
| Speaker in (Binding post) |
| 12v trigger (3.5mm jack) |
| Low-pass filter |
| Active 4th-order, variable cut-off frequency | Dimensions | Height: 310mm (12.2 in) not including feet |
| Width: 310mm (12.2 in) |
| Depth: 375mm (14.8 in) including grille and controls | Net weight | 12.5kg (27.6 lb) | Finishes | Black Ash Vinyl |
| Red Cherry Vinyl | | For big sound in smaller spaces, you canʼt beat the ASW608, the most compact of the 600 Series subwoofers.
Its long-throw 200mm driver allows the ASW608 to move the large volumes of air needed for high-quality low-frequency output, and its audiophile-standard 200W Class D amplifier keeps the unit running cool, even when the music or movie action is whipping up a storm.
In all of the 600 Series subwoofers, the bass driver diaphragms are constructed from a rugged, finely-tuned mix of paper pulp, Kevlar® fibres and resin, which provides the stiffness needed to withstand the tremendous physical forces exerted by the voice coil and pressures inside the cabinet.
Ultra-solid construction delivers slamm
Description |
Active closed-box subwoofer system |
Drive unit |
ø200mm (8 in) paper/Kevlar® cone long-throw |
Frequency range |
-6dB at 23Hz and 25/140Hz adjustable (EQ at A) |
Frequency response |
±3dB 32Hz – 40/140Hz adjustable (EQ at A) |
Bass Extension |
-6dB at 23Hz (position A) |
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-6dB at 28Hz (position B) |
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-6dB at 36Hz (position C) |
Amplifier |
Power output: 200W |
Rated power consumption: |
40W/ 0.5W standby |
Input impedance: |
33kW |
Signal / noise: |
>90dB |
Functions: |
Volume level – line in |
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Volume level – speaker in |
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Low-pass filter frequency – line in only |
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Low-pass filter bypass |
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Bass extension |
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Bass roll-off alignment |
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Auto sense on/standby |
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Phase switch |
Inputs: |
Line In (RCA Phono) |
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Speaker in (Binding post) |
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12v trigger (3.5mm jack) |
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Low-pass filter |
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Active 4th-order, variable cut-off frequency |
Dimensions |
Height: 260mm (10.2 in) not including feet |
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Width: 260mm (10.2 in) |
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Depth: 330mm (13 in) including grille and controls |
Net weight |
8.85kg (19.5 lb) |
Finishes |
Black Ash Vinyl |
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Red Cherry Vinyl |
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Dimensions | Metric :10-1/4” W x 10-1/4” D x 10-1/4” H | 26.0 x 26.0 x 26.0 cm
Driver Complement :One high-definition 7-1/2" long throw woofer, pressure coupled to two 7-1/2” low bass radiators
Frequency Response :16 Hz – 200 Hz
Internal Amplifier Power :650 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 :5 way binding posts
High Level Outputs :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 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 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 :25 lbs | 11.3 kg
Warranty :5 Years; 3 Years for Amplifiers |
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