KEF Ref 24pp Vis (Page 1)
The Reference for a new generation
Funny thing, sound.
As the human voice, as music and in film, it’s
one of the great joys of being alive.
But the more you enjoy sound, the more
demanding you become of how it’s
reproduced. Anything that distracts you from
the purity of the original spoils the pleasure and with modern recording technologies, the
quality you expect gets higher all the time.
components always perform slightly
differently. So as well as carefully matching
each set of speakers, we make sure every
So it is with the legendary Reference Series.
single driver is partnered by units whose
As audiophiles everywhere know, the
output is as near identical as possible.
Reference Series has always been about
setting new standards. Using the most
advanced digital techniques to analyse the way
sound behaves, we create a new generation of
prototypes that push the boundaries of sonic
performance further still.
As the first Reference Series speakers
designed specifically for modern extended
bandwidth digital formats, the new models
deliver a more complete experience of sound
than ever before. At their heart are completely
new Uni-Q® drivers - the ultimate refinement
After exhaustive measurements under
of KEF’s trademark technology - with a
anechoic conditions and listening tests in
sophisticated elliptical dome tweeter of
many different real rooms, using various
astonishing lucidity and a patented ‘Uni-Form’
electronics with both AV and music signals,
flat surround midrange driver. A new titanium
these then become the ‘Reference’ to which
dome hypertweeter that easily outperforms
every production version must conform, to a
any conventional supertweeter. Ultra low
tolerance of just 0.5dB.
distortion bass drivers. Radical new curved
cabinet designs.
Our obsession with audio integrity doesn’t
stop there, though - because however
The technical sections in this brochure explain
meticulously manufactured, individual audio
some of the reasons for these speakers’
phenomenal clarity and accuracy. But no
words can explain how they sound.
So having read, please do go and listen.
In every sense, you’ll find it’s a revelation.
New Uni-Q® array
The new Reference Series embodies an
by a patented co-moulding process, while the
approach to pure sound using technologies
cone profile is optimised by Finite Element
found nowhere else.
Analysis (FEA) to ensure that wavefronts from
the tweeter exit the cavity cleanly.
Although the single point source performance
and wide dispersion characteristics of KEF
Another KEF ‘first’ is the small, superlight
Uni-Q are well known, the new range is based
compound neodymium magnet assembly that
on a radically new design: the first ever Uni-Q
ensures optimum flux profiles for both MF and
driver array dedicated solely to the midrange.
HF coils. Its low mass allows effective
decoupling from the cabinet to prevent box
colouration, and the open chassis design
(in die-cast aluminium alloy for stiffness)
minimises acoustic reflections behind the cone.
Determined to set a new standard of
mechanical integrity for metal dome tweeters,
KEF engineers also used FEA to develop a
unit whose resonance threshold exceeded
30kHz.The result is a deep drawn 25mm
titanium dome with elliptical profile and
The limited movement required at these
frequencies allows a perfectly flat new
optimised surround that substantially
outperforms conventional high-end units.
surround that dramatically reduces diffraction
and intermodulation effects.The filled
The imaging therefore becomes even
polypropylene cone and its thermoplastic
sharper, with virtually no colouration.
rubber surround are produced as one entity
Integration is flawless; the off-axis response,
unrivalled anywhere.
Less distortion at lower frequencies
A lightweight neodymium magnet ‘pot’ and
software, the system incorporates twin
relatively small cone movements allow the
balanced Faraday rings above and below the
lower midrange driver in the Model 207 to be
coil to maintain a perfectly symmetrical flux
fitted with KEF’s short coil/long gap motor
profile (both in and out of the gap) that
system. Although this has an inherently linear
minimises flux modulation.Together with the
flux profile anyway, the design incorporates a
use of an ‘undercut’ T-pole, this configuration
single aluminium Faraday ring around the pole
has the effect of reducing second harmonic
HD (dB)
10"LF unit: 2nd harmonic
HD (dB)
60
60
50
50
40
40
30
30
20
20
20
200
500
10"LF unit: 3rd harmonic
20
200
FREQUENCY (Hz)
500
FREQUENCY (Hz)
to eliminate any residual distortion.The
distortion by as much as 20dB (for 1W input),
configuration also allows the diaphragm to
and third harmonic distortion by 10dB.
be thinner and lighter for increased sensitivity,
with a phase plug shaped to optimise
smooth response.
An open chassis and vented poles minimise any
noise from air trapped internally, and each bass
driver radiates directly from its own subdivided
In the new bass drivers, KEF’s ultra-low
internal enclosure to avoid the standing wave
distortion motor system dramatically reduces
distortions that usually afflict tall cabinets.With
low frequency distortions. After extensive
less damping required, you get more sensitivity
research using the latest magnetics simulation
- and the result is the clearest, most open bass
you’ve ever heard.
Hypertweeter™
Time aligned with the
With flat response to
main array and
50kHz and useful energy
mounted in its
up to 80kHz, this massively
own chrome-plated
extended performance
steel pod, KEF’s new 19mm
titanium dome hypertweeter is
envelope delivers every last
sonic detail encoded in the
essentially a scaled down version of the new
latest wideband formats like SACD, SACD
Uni-Q® tweeter, with the same low distortion
multi-channel and DVD Audio.What you
characteristics at ‘super audio’ frequencies.
actually hear is simply a sweeter, more
natural sound with crystal clear highs.
Inert enclosures
The distinctive design of the new cabinets
measures that both contribute to a more
is a logical extension of KEF’s longstanding
natural sounding upper frequency response.
commitment to enclosures that minimise both
internal acoustic radiation and mechanical
vibrations directly transmitted from the
drive units.
The inherently stiff curved
panels of the main cabinets
are engineered from thick
MDF and extensively
The theoretical sonic advantages of curved
braced internally, with the
enclosures have been known since we
optimum position of each
introduced the first pod system on the
brace determined by
Reference 105 back in the ’70s - but now,
laser interferometry. Add
modern production technologies allow these
independent driver loading
to be precision cast in thick section aluminium,
and KEF’s proven decoupling
which is exceptionally inert.The pod on
techniques, and you get an
the Model 207 is mechanically damped by a
enclosure that allows the
viscoelastic lining and acoustically damped by a
quality of the components
sandwich of melamine foam and light wadding -
within to shine through unimpaired.
Total attention to detail
The componentry is of the highest standards,
Naturally, performance can be fine-tuned for
as you would expect. Polypropylene capacitors,
the acoustics of the room. A boundary control
carefully chosen in comparative listening
tests. Metal oxide film resistors. Iron
device allows you to reduce LF radiation
to compensate for bass gain from
powder inductor cores - selected
energy reflected by a wall close to the
for their superior performance
speaker.This device now has a third
where large values and low DC
resistance are involved.
setting, which boosts LF radiation for
rooms that are subjectively bass light.
Electromagnetic shielding is provided
And for the best possible signal
for home theatre use.
transmission, the WBT ® tri-wire
terminals are plated in gold, and
KEF’s own oxygen-free copper cable
is meticulously graded and soldered by hand.
Each new Reference Series Model is
always a landmark in speaker design, and
the new range is no exception. By objective
measurement and in subjective tests, every
single technical innovation advances the state
of the art.
Meet the Reference for a new generation.
Created by KEF because only KEF can.
Reference Model 205
IDL - independent driver (bass) loading
MODEL
MODEL 207
Awe.Tenderness. Lyricism. Joy.
Beneath the FEA-developed elliptical dome
titanium hypertweeter, the distinctive cast
The spellbinding Reference Model 207 has the
power to create heightened emotional states.
Not by magic, but through technology.
A true five-way design with crossover
frequencies at 120, 400, 3000 and 15000Hz, it
exemplifies everything you’d expect from a
no-holds-barred extended bandwidth speaker
for the 21st century: fabulous imaging over a
aluminium pod houses the new generation
Uni-Q® HF/upper midrange array that gives
the range its stunningly clear voice.
The dedicated 250mm (10") lower midrange
driver features KEF’s superlight neodymium
magnet assembly, which minimises colouration
by allowing the unit to be effectively decoupled
from the cabinet.
commanding sound stage, and the kind of
realism that gives you goose bumps.
The paired long-throw 250mm (10") bass
drivers operate in parallel at low frequencies
where throw is critical, but the lower unit is
rolled off early to allow the upper driver to
dominate at the crossover to the Uni-Q for
near-perfect integration. Separately loaded
into individual direct radiator sub-enclosures,
they deliver staggering bass extension of
exceptional purity.
Profoundly musical and virtually distortionfree, the Model 207 is capable of taking you to
the further reaches of the art of sound.
207
MODEL
MODEL 205
Whether for music or auditorium quality
looks as majestic as it sounds. As the wave
home theatre, Model 205 is one of the finest
fronts from the 25mm (1") elliptical dome
full bandwidth floorstanders you can buy
titanium tweeter are optimised by the
at any price.
computer-modelled profile of the Uni-Form
cone/surround, the upper frequency response
With KEF’s wide dispersion new Uni-Q®/
is incredibly lucid - especially the human voice.
hypertweeter pod faired into the cabinet, it
Both MF and HF coils in the Uni-Q array
But however complex the technologies, their
have compound twin neodymium magnet
combined effect is very simple indeed: you
assemblies, and the two ultra-low distortion
hear more.Your soundscape is more alive.
200mm (8") bass drivers have balanced Faraday
Your enjoyment is more complete, wherever
loops above and below the coil to ensure even
you sit in the room.You feel more. And that’s
flux profiles - and therefore minimum distortion
what entertainment should be about.
and maximum smoothness.
205
MODEL
MODEL 203
Model 203 has all the ingredients that make
with the latest motor systems and lightweight
the larger floorstanders great, but on a slightly
reinforced diaphragms, bass response is
smaller scale - the same new generation KEF
unusually open, with negligible distortion even
technologies, the same carefully chosen high
at high volume.
order components and the same unrivalled
build quality.
Acoustically inert, the curved section cabinets
are heavily braced to eliminate box
Computer optimised audiophile grade four-
colourations, and finished in a choice of hand-
way crossovers ensure that transitions are
matched wood veneers. Magnetically shielded
imperceptible between the five drivers:
like the rest of the range, Model 203
KEF’s patented hypertweeter, the radical new
combines intense musicality with real power -
Uni-Q® midrange/HF array with elliptical
and the sonic imaging is never less than
dome titanium tweeter and the two high
immaculate, right down to the tiniest detail. A
performance 165mm (61/2") LF drivers. And
purist’s loudspeaker.
203
MODEL
MODEL 201
Whether you’re into music or moving image,
plated WBT® terminals. Like all of the range,
Model 201 packs all the benefits of latest
Model 201 can be tri-wired and comes with
Reference Series technology into the
a boundary control device to fine tune
definitive extended bandwidth bookshelf
response to your room. And with magnetic
speaker.The same elliptical titanium dome
shielding and Uni-Q’s inherently wide
hypertweeter.The same die-cast aluminium
dispersion characteristics, you can place them
®
frame for the new Uni-Q array, with its
more or less wherever you like.
lightweight neodymium compound magnet
assembly and computer modelled Uni-Form
waveguide.The same ultra-low distortion LF
motors for hefty bass extension with
uncompromised accuracy.
No compromise anywhere, in fact. Graded
OFC wiring, soldered by hand. Audiophile
crossovers with iron powder core inductors
and high order polypropylene capacitors. Gold
Smooth. Sweet. Spine-tingling clarity,
off-axis as well as on. Not big - but most
definitely beautiful.
201
MODEL
MODEL 204c
The extended bandwidth technology of the
reproducing dialogue and vocals - eerily
new Reference Series really comes into its
natural sounding, and sensitive enough to hear
own for home theatre use - especially in the
the slightest intake of breath. Flanked on either
centre channel, which carries around two-
side by pairs of audiophile quality 165mm
thirds of the audio information encoded in the
(61/2") LF drivers with ultra-low distortion
average movie soundtrack.
motors and reinforced lightweight diaphragms,
you enjoy pin-sharp frontal effects with
With KEF’s titanium dome hypertweeter in
addition to the most sophisticated Uni-Q®
point source array we’ve ever built, Model
gloriously extended, open bass. Naturally, the
timbre match with the other speakers in the
range is perfect.
204c (shown opposite) has the extra
dynamic range to do justice to the latest
The ultimate centre speaker - an investment
digital formats. It’s the ideal combination for
in pure pleasure.
MODEL 202c
As with the 204c, the enhanced single point
Uni-Form cone/surround, vocals acquire an
source effect of KEF’s radically new Uni-Q®
immediacy and presence that you’ve never
design delivers massive listening benefits in
experienced before. 165mm (61/2") low
the Model 202c.
distortion bass drivers on either side have
the power to deliver the full slam of frontal
With the same hypertweeter and an identical
Uni-Q array incorporating KEF’s latest
elliptical dome titanium tweeter and seamless
effects without sacrificing accuracy. Like the
rest of the range, it also sets new standards of
smoothness - transitions between units are
literally imperceptible.
The recommended centre speaker for Models
203 and 201, 202c projects a dynamic,
involving and minutely detailed sound stage
with startling realism, wherever you sit.
Immerse yourself.
204c & 202c
Powered Subwoofers
PSW5000 & PSW4000
PSW5000
The ultimate powered subwoofer - as it
devastating is the answer. From the furniture
would have to be in order to match the
quality real wood enclosure in Black Ash,
awesome performance standards set by the
Maple or Cherry to the tips of its gold-plated
new Reference Series for which it was
terminal block, PSW5000 exudes performance
designed. How does a 1kW Class D amplifier
without compromise.
with a 15" long throw woofer sound? Simply
PSW4000
Serious stuff. No less than 500 watts of high
immaculately controlled. Output level, phase
efficiency Class D amplifier power, with a 12"
(infinitely variable) and the low pass filter
long throw driver in a hand finished wood
frequency can be adjusted via radio remote
cabinet. As you would expect, bass extension
control from anywhere in the home, so the
is more than generous - but what’s really
unit can be concealed wherever you please.
impressive is the way LF response is
MODEL 201
MODEL 203
MODEL 205
MODEL 207
MODEL 202c
MODEL 204c
PSW4000
PSW5000
Design
Design
Design
Design
Design
Design
Design
Design
4 way reflex
4 way reflex
4 way reflex
5 way reflex
4 way reflex
4 way reflex
Bass reflex, downward firing
Bass reflex, downward firing
Drive Units
Drive Units
Drive Units
Drive Units
Drive Units
Drive Units
Drive Units
Drive Units
LF : 1 x 165 mm (61/2")
LF : 2 x 165 mm (61/2")
LF : 2 x 200 mm (8")
LF : 2 x 250 mm (10")
LF : 2 x 165 mm (61/2")
LF : 4 x 165 mm (61/2")
LF: 300 mm (12") long throw
LF: 380 mm (15") long throw
MF : 1 x 165 mm (61/2")
MF : 1 x 165 mm (61/2")
MF : 1 x 165 mm (61/2")
LMF : 1 x 250 mm (10")
MF : 1 x 165 mm (61/2")
MF : 1 x 165 mm (61/2")
HF : 1 x 25 mm (1")
HF : 1 x 25 mm (1")
HF : 1 x 25 mm (1")
MF : 1 x 165 mm (6 / ")
HF : 1 x 25 mm (1")
HF : 1 x 25 mm (1")
SHF : 1 x 19 mm (3/4")
SHF : 1 x 19 mm (3/4")
SHF : 1 x 19 mm (3/4")
HF : 1 x 25 mm (1")
SHF : 1 x 19 mm (3/4")
SHF : 1 x 19 mm (3/4")
1 2
SHF : 1 x 19 mm (3/4")
Frequency response at 15°
horizontally off axis ±3 dB
Frequency response at 15°
horizontally off axis ±3 dB
Frequency response at 15°
horizontally off axis ±3 dB
Frequency response at 15°
horizontally off axis ±3 dB
Frequency response at 15°
horizontally off axis ±3 dB
Frequency response at 15°
horizontally off axis ±3 dB
Frequency response at ± 3 dB
horizontally off axis ±3 dB
Frequency response at ± 3 dB
horizontally off axis ±3 dB
58 Hz - 55 kHz
55 Hz - 55 kHz
45 Hz - 55 kHz
40 Hz - 55 kHz
65 Hz - 55 kHz
53 Hz - 55 kHz
25 Hz - 250 Hz
18 Hz - 250 Hz
LF corner -6 dB
LF corner -6 dB
LF corner -6 dB
LF corner -6 dB
LF corner -6 dB
LF corner -6 dB
LF corner -6 dB
LF corner -6 dB
46 Hz
40 Hz
35 Hz
28 Hz
50 Hz
40 Hz
22 Hz
16 Hz
Crossover frequency
Crossover frequency
Crossover frequency
Crossover frequency
Crossover frequency
Crossover frequency
Crossover frequency
Crossover frequency
400 Hz, 2.7 kHz, 15 kHz
400 Hz, 2.7 kHz, 15 kHz
400 Hz, 2.7 kHz, 15 kHz
120 Hz, 400 Hz, 2.7 kHz, 15 kHz
400 Hz, 2.7 kHz, 15 kHz
400 Hz, 2.7 kHz, 15 kHz
Variable
Variable
Amplifier requirements
Amplifier requirements
Amplifier requirements
Amplifier requirements
Amplifier requirements
Amplifier requirements
Amplifier requirements
Amplifier requirements
50 - 150 W
50 - 200 W
50 - 300 W
50 - 400 W
50 - 200 W
50 - 300 W
Active system, on board 500W amp
Active system, on board 1000W amp
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
Sensitivity (2.83V/1m)
88 dB
89 dB
90 dB
91 dB
89 dB
90 dB
Active system
Active system
Maximum output
Maximum output
Maximum output
Maximum output
Maximum output
Maximum output
Maximum output
Maximum output
110 dB
113 dB
115 dB
117 dB
113 dB
115 dB
110 dB
118 dB
Impedance
Impedance
Impedance
Impedance
Impedance
Impedance
Impedance
Impedance
8 Ω (3.2 Ω min)
8 Ω (3.2 Ω min)
8 Ω (3.2 Ω min)
8 Ω (3.2 Ω min)
8 Ω (3.2 Ω min)
8 Ω (3.2 Ω min)
Active system
Active system
Magnetic shielding
Magnetic shielding
Magnetic shielding
Magnetic shielding
Magnetic shielding
Magnetic shielding
Magnetic shielding
Magnetic shielding
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Weight
Weight
Weight
Weight
Weight
Weight
Weight
Weight
14.8 kg (32.6 lbs)
26.5 kg (58.3 lbs)
33 kg (72.6 lbs)
66 kg (145 lbs)
16 kg (35.2 lbs)
35 kg (77 lbs)
14 kg (30.9 lbs)
25.3 kg (55.7 lbs)
Dimensions (H x W x D)
Dimensions (H x W x D)
Dimensions (H x W x D)
Dimensions (H x W x D)
Dimensions (H x W x D)
Dimensions (H x W x D)
Dimensions (H x W x D)
Dimensions (H x W x D)
557 x 248 x 402 mm
1068 x 248 x 405 mm
1155 x 285 x 433 mm
1290 x 400 x 685 mm
240 x 630 x 315 mm
240 x 1100 x 425 mm
445 x 475 x 475 mm
545 x 590 x 590 mm
21.9 x 9.8 x 15.5 inches
42 x 9.8 x 15.9 inches
45.5 x 11.2 x 17 inches
50.7 x 15.7 x 27 inches
9.4 x 24.8 x 12.4 inches
9.4 x 43.3 x 16.7 inches
17.5 x 18.7 x 18.7 inches
21.5 x 23.2 x 23.2 inches
Finishes
Finishes
Finishes
Finishes
Finishes
Finishes
Finishes
Finishes
Black Ash, Maple or
Black Ash, Maple or
Black Ash, Maple or
Black Ash, Maple or
Black Ash, Maple or
Black Ash, Maple or
Black Ash, Maple or
Black Ash, Maple or
Cherry real wood veneer
Cherry real wood veneer
Cherry real wood veneer
Cherry real wood veneer
Cherry real wood veneer
Cherry real wood veneer
Cherry real wood veneer
Cherry real wood veneer
Dealer Stamp
KEF and Uni-Q are registered trademarks. Uni-Q is protected under GB patent 2 236929. US patent 5,548,657.Worldwide patents pending.
KEF Audio reserve the right, in line with continuing research and development, to amend or change specifications. Part No. PL1370EN.
KEF Audio (UK) Ltd., Eccleston Road,Tovil, Maidstone, Kent ME15 6QP UK.Telephone +44(0)1622 672261. Fax: +44(0)1622 750653. www.kef.com
ADCOM, 10 Timber Lane, Marlboro, New Jersey, 07746 USA.Telephone +(1)732 683 2356. Fax: +(1)732 683 2358. www.adcom.com
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