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“Sit anywhere" Uni-Q Sound
At the heart of the evolved Q Series is the Uni-Q driver array. KEF\'s signature innovation places the tweeter in the acoustic center of the midrange cone, bringing the acoustic ideal of a single point source closer than ever to realisation. The result is a more detailed, more accurate three-dimensional sound image, which is dispersed more evenly throughout the room than is possible with a conventional speaker. Uni-Q\'s ultra-wide dispersion is further enhanced by KEF\'s \'tangerine\' waveguide over the tweeter dome.
Uni-Q sound taken to the next level
The closed box midrange cabinet design reduces the load on the Uni-Q midrange cone, increasing clarity and detail while delivering cleaner, punchier bass.
With the addition of the Damped tweeter loading tube providing a gentle termination of sound produced from the back of the tweeter, lower treble performance is improved dramatically and a new low-distortion inductor on the crossover provides cleaner bass response.
Redesigned Bass Drivers
Low-frequency (LF) drivers now have a larger roll surround, along with a new spider suspension to produce cleaner bass at high volumes. A new cone structure improves midrange clarity, and an enhanced Auxiliary Bass Radiators (ABRs) with a new surround and rear suspension delivers better controlled and more impressive bass.
Redesigned Bass Drivers
Low-frequency (LF) drivers now have a larger roll surround, along with a new spider suspension to produce cleaner bass at high volumes. A new cone structure improves midrange clarity, and an enhanced Auxiliary Bass Radiators (ABRs) with a new surround and rear suspension delivers better controlled and more impressive bass.
Floorstanders The Q550 is the smallest floorstander in the Q Series line. Featuring KEF\'s signature Uni-Q driver array paired with a 130mm (5.25 inch) aluminium bass driver and two matching ABRs, the Q550 delivers a phenomenal audiophile performance with clarity, scale, and controlled bass. Great for large or small rooms the Q550 is available in Satin Black or Satin White finishes. Priced as a pair.
Model |
Q550 |
Design |
Two and a half-way bass reflex |
Drive Units |
130mm (5.25in.) aluminium Uni-Q 25mm (1in.)vented aluminium dome HF 130mm (5.25in.) aluminium LF 2 x 130mm (5.25in.)aluminium ABR |
Frequency range free field |
45Hz (-6dB) |
Frequency Response |
58Hz-28kHz (±3dB) |
Crossover Frequencies |
2.5kHz |
Maximum Output |
110dB |
Amplifier requirements |
15-130W |
Sensitivity |
87dB (2.83V/1m) |
Nominal Impedance |
8 Ohms (min.3.5 Ohms) |
Dimensions |
H x W x D: 873 x 180 x 278 mm 926 x 299 x 310 mm (with Plinth) |
Weight |
14.5kg (32 lbs) |
Unit measurement |
Pair |
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The largest speaker in the 600 Series. This floorstander is ideal for audiophile stereo and home theatre applications in larger rooms, delivering serious performance and amazing value.
The 683 S2 features a Decoupled Double Dome tweeter - technology evolved from Bowers & Wilkins CM10 speaker. The double dome design uses an extremely thin aluminium dome for lightness, surrounded by a thicker aluminium ring for rigidity. The result is a far more precise treble performance. And while the tweeter looks like it's part of the main speaker, it's physically separated in its own gel-filled cavity, so performance isn't hit by unwanted resonances or vibrations, for a more natural, spacious sound.
Serious and accurate bass performance is equally vital to such a room-filling speaker. That's why the 683 S2 features a new bass driver construction method, using a similar method of bracing to the tweeter with twin layers of aluminium. The richer, distortion-free bass response is sumptuous.
As well as new bass driver construction techniques and a new tweeter, brought in from Bower & Wilkins high-end series, the 683 S2 also boasts an FST Kevlar midrange driver. Serious technology, serious performance, but seriously affordable for a speaker of this calibre.
Woven Kevlar | Yes | Crossover Tuning | Yes | Nautilus Tapering Tube | Yes | Flowport | Yes | Mushrooms | Yes | FST | Yes | Technical features | Decoupled Double Dome aluminium tweeter with NautilusTM tube loading
Kevlar® brand fibre cone FSTTM midrange driver
Dual-layer aluminium cone bass driver
FlowportTM | Description | 3-way vented-box system | Drive units | 1x ø25mm (1 in) aluminium dome high-frequency
1x ø150mm (6 in) woven Kevlar® cone FSTTM midrange
2x ø165mm (6.5 in) aluminium cone bass | Frequency range | -6dB at 30Hz and 50kHz | Frequency response | 52Hz - 22kHz ±3dB on reference axis | Dispersion | Within 2dB of reference response
Horizontal: over 60º arc
Vertical: over 10º arc | Sensitivity | 89dB spl (2.83V, 1m) | Harmonic distortion | 2nd and 3rd harmonics (90dB, 1m)
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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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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: 32Hz - 35kHz Sensitivity (1W@1M): 90dB Nominal Impedance: 4 Ohms Maximum SPL (dBA): 116.2 Power Handling (RMS): 175W Recommended Amplifier Requirements (RMS): 50 - 175W Bass Alignment: Bass reflex. Twin HiVe®II port System Tweeter Crossover Frequency: LF/MF: 300Hz MF/HF: 2.2 kHz Drive Unit Complement: 2 x 6" RST® Bass drivers. 1 x 6" RST® Bass/Mid driver. 1 x 1" (25mm) C-CAM® gold dome tweeter Product External Dimensions: (H x W x D) inc. plinth & feet 960 x 275 x 388 mm (37 13/16 x 10 13/16 x 15 1/4 inch) Individual Weight: 21.76 Kg (47.88 lb) User's Manual
| 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) |
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