| 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 |
If itʼs hard to put the sound of the CM9 into words, thatʼs just as well. This top-of-the-range floorstanding speaker will fill even the largest domestic spaces with music so richly detailed, and so startlingly lifelike, that it will leave you speechless.
The three-way CM9 delivers truly commanding bass with the aid of twin 165mm paper/Kevlar® cone drive units. An FST® driver, with its characteristic compression surround supporting the outer edge of the distinctive Kevlar® cone, is specially developed for outstanding midrange performance. The CM9ʼs Nautilus™ tube-loaded aluminium dome tweeter keeps high frequencies crisp and sharp all the way up to 50kHz and beyond.
The quality of CM Series drive units has made it possible to use minimalist crossovers throughout the whole range. The resulting gentle transition between drivers avoids the unnaturally rapid changes in dispersion that bedevil more complex designs, while the high quality components, carefully chosen after exhaustive listening tests, ensure that as little as possible gets between you and the sound of the original recording.
All CM Series speakers come with aluminium driver trims. Grilles attach magnetically, so there are no unsightly grille-mounting features to spoil the clean lines of the speakerʼs façade. For the finish, you can choose either one of two real-wood veneers in Rosenut or Wengé, or a highly polished gloss black.
Technical features
Nautilus™ tube loaded aluminium dome tweeter
Kevlar® brand fibre cone FST midrange
Flowport™
Description 3-way vented-box system
Drive units 1x ø25mm (1 in) aluminium dome high-frequency
1x ø150mm (6 in) woven Kevlar® cone FST midrange
2x ø165mm (6.5 in) paper/Kevlar® cone bass
Frequency range -6dB at 30Hz and 50kHz
Frequency response 56Hz - 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)
| 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) |
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)
![acrobat_reader_logo.]( "acrobat_reader_logo.") 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)
|
| Two way, double series reflex
2 x Woofer 130 mm.
Coated paper, double magnet
Tweeter 26 mm.
Soft dome (silky fabric)
Impedance: 8 Ohm (min. 6,5)
RMS POWER: 100 W
MAX POWER: 150W
Efficiency: 90 dB/W/1m
Dimensions: 170x1030x220mm.
Net weight: 16 Kg.
Finish: leather and cherrywood (or walnut vinyl) |
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