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KEF R900 Floorstanding
With twin 8-inch LF drivers positioned perfectly either side of the remarkably sweet and accurate latest generation Uni-Q driver array, the KEF R900 ensures an incredible scale and depth. Upper registers are articulated with flawless precision, whilst the bass drivers maintain authoritative control over the LF – providing undistorted, earth moving realism and accuracy that will awaken your very soul.
| | Model | R900 | | Design | Three-way bass reflex | | Drive units | Uni-Q driver array:
HF: 25mm (1in.) vented aluminium dome
MF: 125mm (5in.) aluminium
Bass units:
LF: 2 x 200mm (8in.) aluminium | | Frequency range (-6dB) | 35Hz - 45kHz | | Frequency response (±3dB) | 40Hz - 28kHz | | Crossover frequency | 400Hz, 2.9kHz | | Amplifier requirements | 25 - 250 W | | Sensitivity (2.83V/1m) | 90dB | Harmonic distortion
2nd & 3rd harmonics (90dB, 1m) | |
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Room-filling sound without a room-filling speaker cabinet. Slimmer than ever before, the 684 S2 offers an amazing combination of floorstander power, audio performance and unbeatable value.
Switching to 5-inch bass/midrange drivers from the previous 6.5-inch cones, means the 684 S2 is now significantly slimmer than its predecessor, with simultaneously improved audio performance, thanks to Bowers & Wilkins innovation. The two Kevlar cone drivers benefit from smaller voice coils to increase sensitivity.
The 5-inch drivers now also feature Anti-Resonance Plug dustcaps, technology taken from our high-end PM1 speakers, that improve pistonic movement inside the voice coil. This helps to deliver amazingly distortion-free midrange performance, all in a smaller space.
As well as slimmer, improved driver performance, the 684 S2 also features a Decoupled Double Dome tweeter. Double dome technology, brought across from the CM10, increases tweeter rigidity for a more precise sound, while the tweeter sits in a gel-filled cavity, decoupled from the surrounding cabinet - which removes resonances and vibrations, for a more natural, spacious sound.
| Woven Kevlar | Yes | | Crossover Tuning | Yes | | Nautilus Tapering Tube | Yes | | Flowport | Yes | | Technical features | Decoupled Double Dome aluminium tweeter with NautilusTM tube loading
Kevlar® brand fibre cone bass/midrange drivers
FlowportTM | | Description | 2-way vented-box system | | Drive units | 1x ø25mm (1 in) aluminium dome high-frequency
2x ø130mm (5 in) woven Kevlar® cone bass/
midrange | | Frequency range | -6dB at 45Hz and 50kHz | | Frequency response | 72Hz - 22kHz ±3dB on reference axis | | Dispersion | Within 2dB of reference response
Horizontal: over 60º arc
Vertical: over 10º arc |
| Sensitivity | 87dB spl (2.83V, 1m) | | Harmonic distortion | 2nd and 3rd harmonics (90dB, 1m)
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System Format: 3 Way
Frequency Response: 30 Hz - 60 kHz
Sensitivity (1W@1M): 90 dB
Nominal Impedance: 8 ohms
Maximum S.P.L
(Per pair in room): 116.8 dBA
Power Handling (RMS): 200 W
Recommended Amplifier Requirements (RMS): 100 - 200 W
Bass Alignment: Bass reflex. HiVe port system
Crossover Frequency: L.F - M.F: 790 Hz
M.F - H.F: 2.3 kHz
Drive Unit Compliment: 2 x 6.5" RST bass driver
1 x 4" RST mid-range driver
1 x C-CAM H.F ribbon transducer
External Dimensions excl Stand (H x W x D)
1060 x 210 x 330 mm
(41 3/4 x 8 1/4 x 13 inch)
Weight (each) Excluding stands: 27.2 Kg (59.9 lbs)
AVAILABLE IN SIX COLOR FINISHES
![colors_01]( "colors_01")
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Two way, double reflex
2 x Woofer 130 mm.
Covered paper, double magnet
Tweeter 24 x 50 mm.
Isodynamic mylar diaphragm
Impedance: 8 Ohm (min. 6,5)
RMS Power: 100 W
MAX Power: 150W
Efficiency: 90 dB/W/1m
Dimensions: 170x1080x260mm.
Weight: 17 Kg.
Finish: rosewood, black oak
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Twin Ported HiVe® II technology
Sealed Mid-range TLE®
2 x 8" long-throw RDT® bass drivers
1 x 4" RDT® mid-range driver
1 x C-CAM® high frequency ribbon transducer
All cabinet finishes have hand-upholstered front baffles in Ingleston Black premium grade leather
Finish options: Santos Rosewood veneer with clear gloss piano lacquer
Ebony veneer with clear gloss piano lacquer
Piano black gloss
Frequency Response: 28 Hz - 100 KHz
Sensitivity (1W@1M): 90 dB
Nominal Impedance:
4 Ohms
Maximum S.P.L
(Per pair in room): 118.6 dBA
Power Handling (RMS): 300 W
Recommended Amplifier Requirements (RMS): 100 - 300 W
Bass Alignment: Twin Ported HiVe II Technology
Sealed Mid-range TLE
Mid / H.F Crossover Frequency: 4000 Hz
Bass Low Pass Crossover Frequency: 550 Hz
Driver Unit Complement: 2 x 8" long throw RDT bass drivers
1 x 4" RDT mid-range driver
1 x C-CAM high frequency ribbon transducer
External Dimensions -
Including Fixed Plinth & Feet
(H x W x D): 1113 x 410 x 470 mm
(43 13/16 x 16 1/8 x 18 1/2)
Weight (each) including Plinth:
43.8Kg (96.4lbs)
![acrobat_reader_logo.]( "acrobat_reader_logo.") User's Manual AVAILABLE IN THESE COLOR FINISHES ![colors]( "colors")
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PRICE PER SPEAKER
Specifications | Recommended Usage | Front Speakers | | Type | 3-Way Bass Reflex Design |
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| Woofers | Dual 6-1/2" PMD Cone |
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| MidRange Driver | 5" Cone With Waveguide Horn |
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| Tweeters | 1" Aluminum Dome With Waveguide Horn |
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| Magnetic Shielding | Yes |
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| Twin Bass Reflex Ports | Single Port |
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| Gold-Plated Brass Extruded Terminals | Bi-Wiring Terminals |
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| Frequency Response | 30 Hz - 35 kHz |
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| Sensitivity | 88 dB/2.83 V/1 m |
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| Input Power (Maximum / Nominal) | 250W / 100W |
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| Impedance | 6 Ohms |
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| Product Dimensions (W x H x D) | 8-3/4" x 38-9/16" x 13-9/16“ |
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| Product Weight (lbs. each) | 20 Kg
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