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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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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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Product Series Subwoofers
Speaker Type Subwoofer
Frequency Range (+/-3 dB) [Hz] 28 - 190
Maximum SPL [dB] 112
Crossover Frequency [Hz] 40 - 120 Hz
Low Frequency Driver 1 x 12" long stroke Polymere Aluminimum
Enclosure Type Bass Reflex
Bass Reflex Tuning Frequency [Hz] 36.0
Max. Amplifier Power Output [RMS watt] 220
Continous IEC Power Output [RMS watt] 170
Input Impedance [Ω] 25K
Connection input(s) Mono line level (LFE)
Stereo line level (low pass filtered)
RCA
Magnetic Shielding No
Recommended Placement Floor
Near wall or corner
Recommended Distance From Wall [cm] > 5
Functions Crossover Frequency
Phase Switch
Standby (Auto Power) On/Off Switch
Volume (Gain)
Maximum Power Consumption [W] 250
Max. Dimensions Incl. Base And Grille (HxWxD) [mm] 370 x 340 x 380
Weight [kg] 14.7
Accessories Included Manual
Rubber Bumpers
Spikes M6
Finish Black Ash Vinyl
Light Walnut Vinyl
White Vinyl
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Crossover Tuning
Mushrooms
Description Active closed-box subwoofer system
Drive unit ø250mm (10 in) paper/Kevlar® cone long-throw
Frequency range -6dB at 18Hz and 25/140Hz adjustable (EQ at A)
Frequency response ±3dB 25Hz – 40/140Hz adjustable (EQ at A)
Bass Extension -6dB at 18Hz (position A)
-6dB at 23Hz (position B)
-6dB at 28Hz (position C)
Amplifier Power output: 500W
Rated power consumption: 98W / 1W 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: 325mm (12.8 in) not including feet
Width: 325mm (12.8 in)
Depth: 375mm (14.8 in) including grille and controls
Net weight 15.5kg (34.4 lb)
Finishes Matte Black
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The SX-120 subwoofer was designed from the ground up by our engineers in London, with a custom-designed 8-inch driver and a powerful 70W RMS amplifier. Components were hand picked by our in-house engineers and then painstakingly voiced to provide premium sound quality
Features
Rigid MDF cabinet
70W RMS amplifier
8-inch long-throw woofer
Individual controls to tailor volume, crossover frequency and phase adjustment
Sensitivity 180mV for full power output
Frequency response 34Hz - 150Hz
Rated output power 70W
Drive units 1 x 8" (203mm) long throw woofer
Crossover 50 - 150Hz continuous/active
Max. power consumption 100W
Colour Black
Dimensions (WxHxD) 300 x 300 x 310mm (11.8 x 11.8 x 12.2“)
Weight 7.7kg (17lbs) |
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
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