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7
Four drive units in a three-way configuration are
employed in the Model 205/2. The single Uni-Q
driver array for upper mid-range and high
frequencies with ultrasonic extension, and a pair
of 200mm (8in.) drive units in IDL configuration
for low frequencies. This system works optimally
in medium to large rooms where its controlled
and extended bass lays a strong foundation to
the superior imaging of the Uni-Q driver array.
Model 203/2 is a floorstanding three-way
loudspeaker with four drive units designed for
high quality reproduction in medium sized rooms
or where space is limited. Two 165mm (6.5in.)
drive units in IDL configuration handle bass
frequencies, the mid-range and high frequencies
are handled by the Uni-Q driver array
extending the response smoothly into the
ultrasonic region.
Model 205/2
Model 203/2
Model 207/2
The KEF Reference Series products covered by
this manual are loudspeakers designed primarily
to operate away from room boundaries
(free space), where the renowned stereo
imaging of the Uni-Q driver array is at its best.
However, a bass level adjustment is provided
(Uni Balance) on all Reference Series Models
which corrects the response to allow for
placement close to a wall.
In addition, all the models listed feature
a four step independent HF adjustment
(also accessed via the Uni Balance terminals) to
allow further tailoring to a particular acoustic
environment or to allow for the presentation
of accompanying electronics.
All models use Reference matched drive units
and crossovers that have been manufactured to
laboratory-standards and rigorously tested at
every stage of production. The driver
complement of each system reflects the
increasing performance capabilities of each
model, particularly its ability to reproduce wider
bandwidth at higher output levels.
Independent Driver Loading (IDL) is utilised for
the bass sections of this new Reference Range.
Using two identical bass units rather than a
single larger one has the advantage of
maintaining a slim profile for the cabinet and
subsequently wide and even sound dispersion.
Internally, however, a tall slim enclosure suffers
from strong top-to-bottom acoustic standing
waves which are very difficult to control.
IDL divides the enclosure into two half-height
enclosures, one for each bass driver, with much
improved internal acoustics.
Thanks to their internal Magnetic Shielding,
these loudspeakers may be used close-to or
beside a television set or video monitor,
when used in front left and right channel
positions in Home Theatre or Surround
Sound applications.
The centre loudspeakers also include a
bass adjustment for TV or wall mounting,
plus a high frequency boost facility for when
they need to be mounted behind an acoustically
transparent screen.
All models are timbre matched to each other so
combining different models in an AV system is no
problem. Extra Reference loudspeakers can be
added to your system with the knowledge
that the system tonal balance and integration will
be maintained.
Wide entry, gold-plated tri-wire/tri-amp
terminals are fitted to the custom-designed
moulded terminal assembly at the rear of the
loudspeaker cabinet. This allows the use of the
many different gauges of loudspeaker cable that
are available.
Overview of Common Features of KEF Reference
The flagship of the new KEF Reference
range, Model 207/2 is designed to faithfully
reproduce the full bandwidth and
dynamics of music signals. It is a no
compromise design where acoustic
performance is the prime objective.
A complex, fully fourth order, high-quality,
hand-soldered dividing network and five
drive units are utilised in the Model 207/2.
The dividing network has its cross-over
points at 120Hz, 400Hz and 2.3kHz
and smoothly directs appropriate
frequencies to the relevant drive units.
The new 165mm (6.5in.) Reference Series
Uni-Q driver array is used here for upper
mid, high and very high frequencies.
A 250mm (10in.) lower mid-range
unit fitted within its own individual
compartment and two 250mm (10in.)
fibre reinforced pulp-cone bass units,
mounted in IDL (Independent Driver
Loading) configuration, complete the
driver complement.
