KEF R400b Speaker Subwoofer 2x 250W Class D

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

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

Low Frequency Limit:    27Hz (EQ1) 21Hz (EQ2)
Upper Frequency Limit:    40 - 120Hz Variable
Power Output:    500W RMS (1000W Peak)
Low Pass Filter Alignment:    Active 4th order 24dB/Octave (2nd stage filter)
Cabinet Specification:    25mm construction and internal bracing
Cabinet Alignment:    sealed cabinet
Driver Complement:    1 x 12" C-CAM® sub woofer driver featured triple suspension and ling throw 3" voice coil
External Dimensions:
(H x W x D)
inc. amp & driver    340 x 340 x 410 mm
(13 3/8 x 13 3/8 x 16 1/8 inch)
External Dimensions:
(H x W x D)
inc. feet & grille    375mm (15“) high with feet
430mm (16 15/16“) deep
inc amp & grille
Mains Input Voltage Specification:    110 - 120 Vac / 220 - 240 Vac 50/60Hz
Individual Weight:    22.56 Kg (49.63 lb)

 User's Manual

 ΔΙΑΤΙΘΕΤΑΙ ΣΤΑ ΠΑΡΑΚΑΤΩ ΧΡΩΜΑΤΑ

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

With the Impact-Mini you get amazing bass in a tiny cabinet that is almost the same size as the MiniVee-8, but at a very budget-friendly price. This engineering marvel is lightweight with an aluminum cone, furniture-quality cabinet finish and concentrates its 300 watts of output power in the 38 Hz to 140 Hz range. This is Velodyne's lightest weight subwoofer and includes an adjustable low pass crossover frequency so you can easily match the Impact-Mini to your satellite speakers.


Features



Compact, stylish cabinet; high-value subwoofer

6.5" active and 8" passive andonized aluminum woofers

High quality, long throw drivers

2" copper-wound voice coil for exceptional reliability

Down-firing bass radiator for more output, less distortion

"Green” MDP amp rated at 300 watts Dynamic power