KEF R400b Speaker Subwoofer 2x 250W Class D

1,390.00 incl. GR VAT

Available on backorder

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Availability: Upon Request Upon Request SKU: KEF R400b Category:
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 […]

 

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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.)
Weight 21.50 kg

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Quick Comparison

KEF R400b Speaker Subwoofer 2x 250W Class D removeB&W DB1 SUB SUBWOOFER DIAMOND SERIES 1000W removeB&W ASW-608 HI-FI ACTIVE SUBWOOFER 200W removeB&W ASW-610 HI-FI ACTIVE SUBWOOFER 200W removeDEFINITIVE TECHNOLOGY SuperCube III Sub Loudspeaker PIANO GLOSS BLACK removeDEFINITIVE TECHNOLOGY ProSub 800 Subwoofer 300 W MATTE BLACK remove
NameKEF R400b Speaker Subwoofer 2x 250W Class D removeB&W DB1 SUB SUBWOOFER DIAMOND SERIES 1000W removeB&W ASW-608 HI-FI ACTIVE SUBWOOFER 200W removeB&W ASW-610 HI-FI ACTIVE SUBWOOFER 200W removeDEFINITIVE TECHNOLOGY SuperCube III Sub Loudspeaker PIANO GLOSS BLACK removeDEFINITIVE TECHNOLOGY ProSub 800 Subwoofer 300 W MATTE BLACK remove
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SKUKEF R400bDB1ASW-608ASW610SuperCube IIIProSub 800B
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Price1,390.00 incl. GR VAT4,284.55 incl. GR VAT 800.00 incl. GR VAT600.00 incl. GR VAT603.87 incl. GR VAT398.99 incl. GR VAT
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Description
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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.)

Description    Active balanced-drive closed-box subwoofer system
Drive units    2x Ø300mm (12 in) Rohacell® cone long-throw
Frequency range    -6dB at 15Hz and 250Hz
Frequency response    ±3dB 17Hz - 145Hz
Power output:    1000W
Rated power consumption:    135W
Standby power Consumption:    100dB
Functions:    5 Presets
Input sensitivity
Gain
Low-pass filter
Graphic equalisation
Room compensation
Auto on/standby
Trigger on/standby
Trigger preset switching
RS-232 automation control
Inputs:    Stereo Line In (2x RCA Phono)
Mono (LFE) Line In (RCA Phono)
Mono (LFE) Line In (XLR balanced)
Dimensions    Height:490mm (19.3 in) not including feet
Width: 460mm (18.1 in) including grilles
Depth: 410mm (16.2 in) including controls
Net weight    44kg (97 lb)
Cabinet finish    Gloss Black
Cherrywood
Rosenut
Grille    Black cloth

 

ALSO AVAILABLE IN  Cherrywood, rosenut

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)
-6dB at 28Hz (position B)
-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
Volume 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: 260mm (10.2 in) not including feet
Width: 260mm (10.2 in)
Depth: 330mm (13 in) including grille and controls
Net weight 8.85kg (19.5 lb)
Finishes Black Ash Vinyl
Red Cherry Vinyl

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.

 

 

DescriptionActive closed-box subwoofer system
Drive unitø250mm (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
DimensionsHeight: 310mm (12.2 in) not including feet

Width: 310mm (12.2 in)

Depth: 375mm (14.8 in) including grille and controls
Net weight12.5kg (27.6 lb)
FinishesBlack Ash Vinyl

Red Cherry Vinyl

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

Dimensions | Metric :10-5/16” W x 15-3/4” D x 12-7/8” H | 26.2 x 40.0 x 32.7 cm
Driver Complement :One high-definition 8" woofer pressure coupled to one 8" low bass radiator.
Frequency Response :20 Hz – 150 Hz
Internal Amplifier Power :300 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
Low Level Inputs :One LFE input (for SW preout only)
High Pass Crossover :Non Variable 6 dB/octave @ 80 Hz: Available only with high level inputs and outputs
Low Pass Crossover% :24 dB/octave, continuously variable from 40 Hz – 150 Hz: Available with high level inputs only
Available Finishes :Matte Black; Matte White
Fuse :3.2 amp 250 volt Slo Blo (US) | 2 amp 250 volt Slo Blo (International)
Packaging :Packaged individually or as part of ProCinema 800 system
Weight | Metric :26 lbs | 11.8 kg
Warranty :5 Years; 3 Years for Amplifiers

Weight21.50 kg44.00 kg8.85 kg12.50 kg11.30 kg11.80 kg
DimensionsN/AN/AN/AN/AN/AN/A
Additional information
Weight 21.50 kg
Weight 44.00 kg
Weight 8.85 kg
Weight 12.50 kg
Weight 11.30 kg
Weight 11.80 kg