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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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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) User's Manual AVAILABLE IN THESE COLOR FINISHES
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Single Ported HiVe® II technology Sealed Mid-range TLE® 2 x 6.5” 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 Optional dedicated floor stands are available Frequency Response: 35 Hz - 100 KHz Sensitivity (1W@1M): 90 dB Nominal Impedance: 4 Ohms Maximum S.P.L (Per pair in room): 117.8 dBA Power Handling (RMS): 250 W Recommended Amplifier Requirements (RMS): 100 - 250 W Bass Alignment: Rear Ported HiVe®II technology Sealed Mid-range TLE® Mid / H.F Crossover Frequency: 3600 Hz Bass Low Pass Crossover Frequency: 600 Hz Drive Unit Complement: 2 x 6.5" 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 (H x W x D): 998 x 360 x 375 mm (39 5/16 x 14 3/16 x 14 3/4 inches) Weight (each) Including Plinth: 33Kg (72.7 lbs) User's Manual AVAILABLE IN THESE COLOR FINISHES
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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
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Frequency Response: 48 Hz - 35 KHz Sensitivity (1W@1m): 90 dB Nominal Impedance: 8 Ohms Power Handling Single (RMS): 100 W System Power Handling (RMS): 150 W Recommended Amplifier Requirements: 20 - 150 W Maximum SPL (dBA): 108 Bass Alignment: Front and rear ported Drive Unit Complement: 2 x 100mm (4“) MMP®II cone bass/mid driver. 1 x 25mm (1“) C-CAM® gold dome tweeter External Dimensions (H x W x D): mm (inches) 1000 x 125 x 140 mm (39 3/8 x 4 15/16 x 5 1/2) (Without spikes) Weight (each): Kg (lbs) 10.2 (22 1/2) User's Manual
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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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