KEF 205.2 Owners manual

Important Safety Information

Thank you for purchasing KEF Reference Series loudspeakers. These have been designed to faithfully reproduce high quality sound over many years of use and should provide realistic reproduction of music and speech. Please take a little time to read these instructions prior to use.

Your KEF Reference Loudspeakers are tall, slim and extremely heavy. Installed correctly on a smooth, level surface, your loudspeakers should be entirely safe to listen to and to live with.

1. Read this manual carefully, especially the safety information, before attempting to assemble and operate the system.

2. Follow the unpacking and assembly instructions on the cartons. Please note that lifting the heavier Model 207/2 and Model 204/2c requires two able-bodied persons.

However, if you have small children, large pets, the infirm, uneven flooring or unusually thick carpeting in your home, then correct adjustment of the foot assemblies is imperative, if safe, stable operation is to be achieved.

Warning: The metal tweeter dome now has protective mesh at the centre of the Uni-Q driver array; if however this is compromised and the dome itself is dented, it will permanently impair performance.

4. Trailing cables are dangerous. Ensure all cables are secure and tidy.

5. When stripping cables use only tools designed specifically for the purpose ie: correct wire cutters or cable strippers. Do not attempt to strip cables with a knife as this could result in serious injury.

OWNERS MANUAL

3. Never connect the system directly to the electricity supply.

General Care of your System

1. Avoid temperature extremes.

2. Avoid damp.

3. Avoid direct sunlight.

4. Clean with the KEF cloth provided.

5. Do not use spirit based cleaners.

If you are at all uncertain about setting up, operating or caring for your system your dealer will be pleased to assist you.

Model 201/2 Model 202/2c Model 203/2 Model 204/2c Model 205/2 Model 206/2ds Model 207/2

Part No.: 290201E

Issue 2: January 2007

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Contents

Important Safety Information 1 General Care of Your System 1 Contents 3 Introduction 5

Overview of Common Features 6 Model 207/2 7 Model 205/2 7 Model 203/2 7 Model 201/2 8 Model 206/2ds 8 Model 202/2c 8 Model 204/2c 8

Installation and Operation 9

Unpacking, Handling and Aftercare 9 Adjusting the Feet and/or Spikes 10 Loudspeaker Placement and Room Acoustics 11 Loudspeaker Positioning 12 Amplifier to Loudspeaker Connections 14 Amplifier Requirements and Power Handling 14 Uni Balance Adjustment Models 201/2, 203/2, 205/2, 207/2, 206/2ds 15 Placement Adjustment Models 202/2c, 204/2c 17 Single, Bi and Tri-wire Connections 18 Loudspeaker Cables 23 Grilles 23

Option

Warranty 23

Service Information 23

Specifications 24 KEF Heritage 29

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Introduction

Since its formation in 1961, KEF has pioneered many innovations in loudspeaker technology and design. Your new Reference Series loudspeakers contain one of the latest of these advances the KEF ‘Project Austin’ Uni-Q driver array.

In this innovative KEF design, not only are the mid and high-frequency drivers on the same axis (co-axial), but their acoustic centres are also on the same plane (co-planar). The profile of the mid-frequency driver’s cone modifies the directivity factor (or ‘Q’) of the high frequency unit such that both drive units have the same directivity in the critical crossover region, where they are operating at similar frequencies. This unification of the ‘Q’ of the drive units lies behind the name “Uni-Q”.

Now incorporated in many KEF loudspeakers, the Uni-Q driver array yields immediate and readily audible sonic benefits. With no sharp discontinuity in ‘Q’ at the crossover frequency, correct tonal balance is not confined to a single ‘sweet spot’ in the listening room and is extended to cover a far broader area. With sound arriving in phase, the sound source is brought into the sharpest possible focus. With properly recorded material and as part of a good quality system, well set-up, loudspeakers with KEF Uni-Q can reveal the location of each musical voice in the stereo image with pin-point accuracy and with a much smoother response being maintained off-axis - where most people listen - than before.

The latest Uni-Q array implemented in this range is a sophisticated device offering a combination of wider bandwidth and wider dispersion than its predecessor.

Both the midrange and high frequency drivers have been symbiotically designed to take us one step closer to the ideal of a controlled directivity point source acoustic radiating system. The 165mm (6.5in.) midrange section has a shallow ‘Uni-Form’ cone profile which gives excellent midrange performance but also provides the optimum waveguide for the coincidentally mounted tweeter.

This new two piece 25mm (1in.) titanium dome tweeter has been developed utilising Finite Elements Analysis techniques to provide ‘pistonic’ motion to a much higher frequency, eliminating the need for a separate hyper-tweeter.

It also features a vented pole piece, increasing the air space behind the dome providing an extended but smooth high frequency performance whilst retaining ultra wide bandwidth source compatibility: DVD-A/SACD.

Overview of Common Features of KEF Reference

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.

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.

Model 205/2 Model 203/2

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.

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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.

Installation and Operation

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Unpacking, Handling and Aftercare

Model 201/2 Model 206/2ds

This is a three-way loudspeaker designed primarily for high quality reproduction as a main loudspeaker in small rooms or as a high quality satellite loudspeaker in AV systems where space is at a premium. Model 201/2 has three drive units, two of which are combined in the single 165mm (6.5in.) Uni-Q driver array, with a 165mm (6.5in.) fibre reinforced pulp cone bass unit mounted in a reflex enclosure, completing the driver line up.

The Model 206/2ds is a dedicated dipole rear surround loudspeaker for KEF Reference multi-channel systems. Incorporating two Reference Series Uni-Q driver arrays and an additional 200mm (8in.) ultra low distortion bass driver, the Model 206/2ds is perfectly timbre matched with the other Reference Series loudspeakers.

These Reference Series loudspeakers are packed one loudspeaker per carton. Prior to unpacking, please ensure that the serial numbers of the loudspeakers supplied match each other. Then, unpack the loudspeakers carefully and inspect for any sign of damage. Your loudspeakers left KEF in perfect condition. If any damage is apparent, you should notify your retailer or consultant immediately. Retain the packaging in case a need arises for you to transport the loudspeakers at a later date.

You will notice that a special KEF care-pack is included with each pair of loudspeakers. This pack contains a cleaning cloth and all the required accessories for connecting and positioning your loudspeakers. The care pack also contains the unique product build certificate. This is a valuable document and guarantees the quality and craftsmanship of your loudspeakers.

The cabinets are finished in real wood veneer and should be treated with the same care with which you would treat fine furniture. A suitable cleaning cloth is included in the customer care pack to maintain the original finish and lustre.

It is normal for the appearance of wood veneer to change with the passing of time, but locations in direct sunlight should, if possible, be avoided. Furthermore the cabinets should not be allowed to become wet.

Each Reference Series floorstanding loudspeaker is supplied with KEF designed substantial spikes and locking nuts (also in the care pack). This enables fine adjustment of level, depending on your preferred location of the loudspeakers whatever the floor covering, carpet, tile or block wood. In addition to the spikes and locking nuts each Model 207/2 also comes with castors.

Model 202/2c Model 204/2c

Model 202/2c is a centre channel loudspeaker designed primarily to match the Model 201/2 and Model 203/2 main loudspeakers and smaller screens. It uses the same drive unit complement as the Model 203/2 and, like the larger Model 204/2c is timbre matched to the other Reference Series loudspeakers thereby allowing a seamlessly integrated 3D soundstage to be set up in the listening room. The size has been chosen to allow it to be mounted more conveniently underneath the screen within the typical dimensions of a 32in. widescreen TV or panel stand.

Models 202/2c and 204/2c have magnetically shielded drive units and crossover networks thus minimising any interference with CRT type televisions.

Truly a statement centre channel loudspeaker, the Model 204/2c fully exploits the dynamics and bandwidth of modern AV soundtracks. With around 70% of a typical soundtrack coming from the centre channel it makes sense to make this loudspeaker a truly capable one. Four 165mm (6.5in.) LF units combine with the 165mm (6.5in.) Uni-Q driver array in a three way reflex system which, like the Model 202/2c, not only has a bass level adjustment for close to wall mounting but also a treble boost facility for mounting behind an acoustically transparent screen.

Four specialised rubber feet or bumpers are firmly fixed to the base during production to make sitting easier straight from the box. In addition, dedicated stands are available for the Model 202/2c and Model 204/2c centre loudspeakers which allows them to be securely mounted for optimum performance in free space.

Adjusting the Feet and/or Spikes

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Loudspeaker Placement and Room Acoustics

Under normal circumstances your loudspeakers will be commissioned by your retailer or consultant, who will have been trained in their installation by KEF.

KEF strongly recommend that you do not attempt to level your loudspeakers single-handed.

Recruit the assistance of another adult or consult an authorised KEF Reference outlet for assistance which may be chargeable if the purchase was not made through them originally.

The spike/locking nut combination supplied is designed to provide small adjustments, not to compensate for seriously irregular floors. A spirit level is provided with certain models to gauge when the loudspeaker is perfectly level.

A rigidly-sited loudspeaker performs better than one that can move because it enables the cabinet to remain fixed while the drive units are allowed to move as determined by the source signal.

Best results will be obtained if the loudspeakers are level and stable. Check the general stability of each loudspeaker by gently rocking it from side to side, front-to-back and diagonally. Often, you will find that the loudspeaker is close to vertical, but rocks because one spike (or two spikes diagonally) seems too short.

If the general stability is good, but the loudspeaker is leaning to left, right, backward or forward, then equal minor adjustments to the two spikes opposite to the direction of lean should be made.

The listening room is one of the most variable elements in the hi-fi chain and its effect cannot be emphasised too strongly, nor can its effects be reliably predicted. Spacing the loudspeakers approximately 2m - 3m (6ft. - 10ft.) apart will allow the stereo images to develop fully. You should sit at a distance at least equal to and preferably greater than the distance between the loudspeakers.

Positioning the loudspeaker in a corner or near to a side wall is not recommended as the significant bass boost caused by this position will affect the sound and cause the stereo image to deteriorate. However, placement close to the front wall is catered for in the Uni Balance feature (see later). It is best to place the loudspeakers symmetrically within the room,

relative to the walls, ceiling and floor, where possible.

Be aware also that soft furnishings near to a loudspeaker will deaden the sound - similarly, nearby reflective surfaces may brighten up the sound. Move the loudspeakers until you are satisfied that the sound is right and that the stereo image is well defined.

Like all other KEF Uni-Q loudspeakers, your Reference Series loudspeakers are designed to be used with little or no ‘toe-in’. However if required a ‘brighter’, or ‘sharper’ sound may be obtained by pointing the loudspeakers directly towards the listening position or adjusting the HF output (via Uni Balance).

* Only supplied with

Model 207/2

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