| Content | “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
Q750 is the intermediate model for the Q Series floorstanders. Featuring the KEF signature Uni-Q driver array paired with an impressive 165mm (6.5 inch) aluminium bass driver and two matching ABRs, the Q750 combines astonishing sonic reproduction with powerful room filling bass.
| Model |
Q750 |
| Design |
Two and a half-way bass reflex |
| Drive Units |
165mm (6.5in.) aluminium Uni-Q
25mm (1in.)vented aluminium dome HF
165mm (6.5in.) aluminium LF
2 x 165mm (6.5in.)aluminium ABR |
| Frequency range free field |
42Hz (-6dB) |
| Frequency Response |
48Hz-28kHz (±3dB) |
| Crossover Frequencies |
2.5kHz |
| Maximum Output |
111dB |
| Amplifier requirements |
15-150W |
| Sensitivity |
88dB |
| Nominal Impedance |
8 Ohms (min.3.8 Ohms) |
| Dimensions |
H x W x D:
923 x 210 x 306 mm
977 x 323 x 310 mm (with Plinth) |
| Weight |
16.5kg (36.4lbs) |
| Unit measurement |
Pair |
Grille not included |
Driver Complements
Subwoofer 2 - 6" Diameter (15.24cm)
Dynamic Balance Cassini Ovals with Super Cell Aerated Polypropylene diaphragms 2 - 5" Diameter (12.70cm)
Dynamic Balance Cassini Ovals with Super Cell Aerated Polypropylene diaphrams
Mid/Woofer 1 - 6 1/2" Diameter (16.51cm)
Dynamic Balance driver with Super Cell Aerated Polypropylene cone 1 - 5 1/4" Diameter (13.34cm)
Dynamic Balance driver with Super Cell Aerated Polypropylene cone
Midrange 1 - 3 1/4" Diameter (8.26cm)
Dynamic Balance driver with Super Cell Aerated Polypropylene cone 1 - 3 1/4" Diameter (8.26cm)
Dynamic Balance driver with Super Cell Aerated Polypropylene cone
Tweeter 1 - 1" Diameter (2.54cm)
Dynamic Balance Enhanced Ring Radiator Tweeter 1 - 1" Diameter (2.54cm)
Dynamic Balance Ehanced Ring Radiator tweeter
Electrical
Overall Frequency Response 20Hz-40kHz 22Hz-40kHz
Lower -3dB Limit 38Hz dB 42Hz dB
Upper -3dB Limit 30kHz dB 30kHz dB
Nominal Impedance compatible with 8 ohm outputs ohms compatible with 8 ohm outputs ohms
Recommended Amplifier Power 20-300 w/channel 20-250 w/channel
Efficiency 88 dB 88 dB
Crossover Orth Crossover Orth Crossover
Crossover
(mid-high array) 3000Hz 2800Hz
Crossover
(subwoofer) 100HZ 100Hz
Inputs Dual Gold-Plated Binding Posts Dual Gold-Plated Binding Posts
Dimensions
Cabinet Size 50 13/16" H x 9 1/2" W x 18 7/16" D
(129.06cm H x 24.13cm W x 46.83cm D) 47" H x 8 5/16" W x 14 3/8" D
(119.38cm H x 21.11cm W x 36.51cm D)
Footprint Size 10 1/2" W x 20 5/16" D
(26.67cm W x 51.59cm D) 9 1/4" W x 16 1/4" D
(23.50cm W x 41.27cm D)
Mounting Options floor floor
Enclosure Type Sealed Sealed
Enclosure Type
(subwoofer) Dual PowerPort Dual PowerPort bass venting
Shipping/Other
Product Weight 99.20 lbs. (45.00kgs) 78.00 lbs. (35.38kgs)
Shipping unit: each each
Total Shipping Weight 114.70 lbs. (52.03kgs) 86.40 lbs. (39.19kgs)
Speaker Warranty 5 years parts and labor (original purchaser) 5 years parts and labor (original purchaser)
ALSO AVAILABLE IN "EBONY" COLOR
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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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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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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)
![acrobat_reader_logo.]( "acrobat_reader_logo.") User's Manual AVAILABLE IN THESE COLOR FINISHES ![colors]( "colors")
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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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