KEF Reference 205/2
Contents
1. Frequency Response 15 horizontally off axis 3dB 55Hz 60kHz Crossover Frequencies 450Hz 2 5kHz Amplifier Requirements 50 150W Sensitivity 2 83V 1m 86dB Maximum Output 11048 Impedance 80 4 20 min Bass Extension 44Hz 6dB Weight 12 3Kg 27 1155 Dimensions H x W x D 417 x 248 x 405 mm 16 4 x 9 8x 15 9 in Finishes Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore 24 25 MODEL 202 2c Design Bass reflex three way centre loudspeaker magnetically shielded Drive Unit Array 2 x 165mm 6 5in LF x 165mm 6 5 Uni Q MF including a 25mm lin titanium HF Frequency Response 15 horizontally off axis 3dB 65Hz 60kHz Crossover Frequencies 400Hz 2 3kHz Amplifier Requirements 50 200W Sensitivity 2 83V Im 89dB Maximum Output 113dB Impedance 80 3 20 min Bass Extension 50Hz 6dB Weight 15 6Kg 34 3lbs Dimensions H x W x D 200 x 630 x 315 mm 79 x 24 8 x 12 4 in Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore MODEL 204 2c Design Bass reflex three way centre loudspeaker magnetically shielded Drive Unit Array 4 x l65mm 6 5in LF x 165mm 6 5in Uni Q MF including a 25mm lin titanium HF Frequency Response 15 horizontally off axis 3dB 53Hz 60kHz Crossover frequencies 400Hz 2 3kHz Amplifier Requirement2. KEF Heritage co oO oo ON NN DWM 10 12 14 14 15 17 18 23 23 23 23 24 29 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
3. Now as in 6l it s all about greatness by design G UNI IKKEF www kef com GP Acoustics UK Ltd Eccleston Road Tovil Maidstone Kent MEI5 6 U K Telephone 44 0 1622 672261 Fax 44 0 1622 750653 GP Acoustics US Inc 10 Timber Lane Marlboro New Jersey 07746 U S A Telephone 4 1 732 683 2356 Fax 1 732 683 2358 GP Acoustics GmbH HeinrichstraBe 51 D 44536 L nen Deutschland Telephone 49 0 231 9860 320 Fax 49 0 231 9860 330 GP Acoustics France SAS 39 Rue des Granges Galand BP414 37554 Saint Avertin CEDEX France Tel 33 0 2 47 80 49 Ol Fax 33 0 2 47 27 89 64
4. 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 Installation and Operation Unpacking Handling and Aftercare 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 N e 19 The cabinets are finished in real wood veneer and should be treated with the
5. cap our 2 0 Frequency HF Adjustment Placement Adjustment Models 202 2c and 204 2c The HF Adjust A and B terminals control the Four settings for tweeter output level are LF Adjustment high frequency output of the loudspeaker possible 40 75 0 flat 0 75 and 1 5dB For a This facility allows the user to adjust the brighter or sharper sound select 40 75 to The two centre channel loudspeakers television setting corrects the bass response brightness of the loudspeaker to suit listening remove brightness select 0 75 or 1 54 Models 202 2c and 204 2c incorporate a two for when the loudspeaker is placed on top of room acoustics partnering electronics and The adjustment is made by screwing one position Free Space Television Uni Balance that or directly underneath a TV In the Model personal taste both or neither of the gold plated screw caps adjusts the bass level depending on whether the 204 2c the television setting corrects the bass into the HF Adjust A and B terminals according to the table below The default setting loudspeaker is mounted freestanding or close to a TV or wall boundary In the Model 202 2c the response for when the loudspeaker is placed on a stand close to a wall is 0 flat one screw cap in terminal B Level dB LF level dB Free Space 0 0 Television 3 0 Frequency 300 Hz MODEL 202 2c Level dB Level dB Cap HF Mode A
6. the Uni Q driver array The dividing network has its cross over points at 20Hz 400Hz and 2 3kHz and smoothly directs appropriate frequencies to the relevant drive units The new l65mm 6 5in Reference Series Uni Q driver array is used here for upper mid high and very high frequencies A 250mm lOin lower mid range unit fitted within its own individual compartment and two 250mm 10 fibre reinforced pulp cone bass units mounted in IDL Independent Driver Loading configuration complete the driver complement Model 203 2 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 l65mm 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 201 2 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 5 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 Model 202 2c Model 202 2c is a centre channel loudspeaker designed primarily
7. 3 With the installation of a Hewlett Packard computer at the Maidstone Head Office in 1975 the Corelli Calinda and Cantata were all designed under the total system concept and with them came a second Queen s Award for Export in the same year 1977 saw the most radical KEF design yet in the Model 105 which apart from setting new standards for flat frequency response introduced a design by which the mid and treble were split from the bass box and placed within a contoured moulded enclosure above the bass enclosure The added ability to angle the separate unique head unit provided the opportunity for the user to tailor the 105 to his or her own environment The loudspeaker was of such general importance and consumer interest that a leading quality UK Newspaper The Daily Telegraph featured the Model 105 on the front cover of its magazine supplement More Reference Models were to follow 1978 saw the launch of the 101 and 103 and in 1979 a further refined 105 2 Model appeared Total System design testing equipment The 1980 s Ten years of growth world wide followed peaking with a massive onslaught on the lucrative and influential US market in 1985 with the setting up of KEF Electronics of America seen as the appropriate recognition of this important market place 1986 saw more activity amongst the now world famous KEF Reference Series the 104 2 always regarded as one of the world s truly outstanding loudspeaker
8. B level d B Mode level dB k Free Space 0 0 075 20 2 Television 2 0 E 5 in in 0 75 3 1 50 4 i Freq 2 out m 0 00 50 150 300 ded MODEL 204 2c 3 in out 0 75 3E 4 out out 1 50 HF Adjustment Models 202 2c and 204 2c The two centre loudspeakers Models 202 2c the loudspeaker is positioned behind a typical and 204 2c incorporate a two position high acoustically transparent projection screen frequency level adjustment which allows see below Select Screen when the loudspeaker compensation for the sound attenuation when is positioned behind a screen Level dB LF Mode level dB 075 L Screen 0 75 kE o0 2 Normal 000 These adjustments as mentioned earlier are Amplifiers that may have either a very forward provided not only for room tuning but or bright presentation can be tamed or equally to alow a more sympathetic partnering to those that have quite a warm presentation can requency some electronics be given extra sparkle it is your choice Single Bi and Tri wire Connections Tri wiring Tri amping Terminals The three sets of input terminals are linked by a high quality shorting cable Removal of this cable will allow the LE MF and HF sections to be connected separately either by a parallel connection from one amplifier known as tri wiring or to separate power amplifiers Attaching Shorting Links M ea y driven from the same pre amplifier tri amp
9. Model 201 2 IKKEF d REFERENCE Model 202 2c OWNERS MANUAL Model 203 2 Model 204 2c Model 205 2 Model 206 2ds Model 207 2 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 l 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 3 Never connect the system directly to the electricity supply Avoid temperature extremes 2 Avoid damp 3 Avoid direct sunlight 4 Clean with the KEF cloth provided 5 Do not use spirit based cleaners Important Safety Information 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 prot
10. ariable suction vacuum cleaner with soft brush attachment It should be noted however that failure of the loudspeaker due to abuse improper or inappropriate use and or operation or damage caused by other faults in your system are NOT covered within the terms of the guarantee Service problems should be discussed in the first instance with the dealer from whom the loudspeakers were originally purchased Generally warranty claims are best handled by your dealer However in case of difficulty please contact Customer Services Department KEF Audio UK Eccleston Road Tovil MAIDSTONE Kent MEI5 6QP UK Telephone No 44 0 1622 672261 Fax No 44 0 1622 750653 www kef com Specifications MODEL 207 2 Design Bass reflex four way floorstanding loudspeaker magnetically shielded Drive Unit Array 2 x 250mm 10 LF x 250mm 10in LMF I x 165mm 6 5in Uni Q MF including a 25mm lin titanium HF Frequency Response 15 horizontally off axis 3dB 40Hz 60kHz Crossover Frequencies 120Hz 350Hz 2 3kHz Amplifier Requirements 50 400W Sensitivity 2 83V 1m 9148 Maximum Output 11748 Impedance 80 3 00 min Bass Extension 26Hz 6dB Weight 66Kg 145155 Dimensions H x W x D 1226 x 400 x 685 mm 48 2 x 157 x 27 in Finishes Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore MODEL 205 2 Design Bass reflex three way floors
11. can be overloaded and damaged The lower limits of amplifier power are those necessary to give a reasonable sound pressure level under domestic conditions Remember it is easier to damage the loudspeaker by using a small amplifier driven into distortion by too much volume possibly with bass and treble boost than by using a larger amplifier which has power in reserve If in doubt ask the advice of your retailer or consultant Uni Balance Adjustment Models 201 2 203 2 205 2 207 2 and 206 2ds Models 201 2 203 2 205 2 207 2 and 206 2ds incorporate separate adjustments for bass and treble output situated at the top of the terminal panel see below The left hand terminal allows a two position bass level adjustment while the centre and right hand terminals LF Adjustment With the supplied cap screwed into the LF Adjust terminal the bass level is set at the flat setting for free space positioning When a loudspeaker is positioned close to a wall the perceived bass level is increased by approximately 2dB Level dB 00 20 2 Cut cap out 50Hz 150Hz 300 Hz allow a four position tweeter level setting Three gold plated screw caps are supplied with each loudspeaker one for the LF and two for the HF adjustment If the cap is removed from the LF Adjust terminal the bass level is reduced to correct the loudspeaker response for the proximity of the wall LE Mode level dB I capin 0 0 2
12. d the CR200F and its sub bass partner the CR250SW set new standards from in wall ceiling units Then again in 1988 came Uni Q A design process painstakingly evolved by KEF over several years by which a single point source at last became a reality The HF units made use of a rare earth magnet material Neodymium Iron Boron which was developed for the NASA Space Programme 0 times more powerful than a conventional loudspeaker magnet this material allowed KEF engineers to make a tweeter small enough to fit within the bass unit coil former at the precise acoustic centre of the cone KEF s Uni Q technology delivered well defined stereo imaging over a much wider listening area without the need for the time honoured sacred hot spot in the listening room The 105 3 was a massive success bringing together not just Uni Q now in its second generation form but all of KEF s magnificent technology coupled cavity bass loading conjugate load matching force cancelling rod computer matched crossovers and drive units even hand pair matched veneer finishes in fact almost everything by which KEF had made its name as the world s foremost loudspeaker company in to one product It was voted Best Imported Speaker by the Japanese Press in 1992 Uni Q Technology 30 3l The 1990 s Under new ownership in 1992 KEF Audio found itself equipped with new ideas new personalities and new products But the same philosophies of so
13. dly 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 Loudspeaker Placement and Room Acoustics 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 lOft 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 b
14. ective 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 General Care of your System If you are at all uncertain about setting up operating or caring for your system your dealer will be pleased to assist you d Part No 29020 1E Issue 2 January 2007 b OD EIS Correct Wrong Adjustment Switch off appliance Caution Warning Positive RED Negative BLACK Option Contents Important Safety Information General Care of Your System Contents Introduction Overview of Common Features Model 207 2 Model 205 2 Model 203 2 Model 201 2 Model 206 2ds Model 202 2c Model 204 2c Installation and Operation Unpacking Handling and Aftercare Adjusting the Feet and or Spikes Loudspeaker Placement and Room Acoustics Loudspeaker Positioning Amplifier to Loudspeaker Connections Amplifier Requirements and Power Handling Uni Balance Adjustment Models 201 2 203 2 205 2 207 2 206 2ds Placement Adjustment Models 202 2c 204 2c Single Bi and Tri wire Connections Loudspeaker Cables Grilles Warranty Service Information Specifications
15. est 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 vA s A 2 3 m 6 10 A A 225 mm 9 min B 1 m 36 min 9 Optional Subwoofer MODEL 202 2c DEN aan MODEL MODEL 201 2 203 2 205 2 207 2 Only supplied with Model 207 2 Loudspeaker Positioning i MODEL 206 2ds x N N MODEL 206 2ds MODEL 201 2 MODEL 201 2 zzz t nam PEF 9 32 958 NNN MODEL 201 2 2m 2m esse 6 8 6 8 1____ Y Y MODEL 206 2ds OOOO Amplifier to Loudspeaker Connections All connections should be made with the amplifier switched OFF Ensure the integrity of all connections prior to switching the amplifier ON KEF Reference Se
16. he sheer engineering excellence of the company an unswerving KEF attribute for over 30 years Comments such as the best I ve had in my listening room from the US magazine Stereophile and KEF s best yet from UK magazine Hi fi News were just two of the many plaudits showered on the Model Four The home theatre series boomed and the company introduced the Model 20B a baby brother for the Model 30B active subwoofer The Coda Series particularly the Coda 7 continually outsold competing brands throughout the world 1996 also saw the launch of the new Q Series and the new Monitor Series superbly crafted loudspeakers to meet the challenges of the next century Both ranges epitomise KEF s total commitment to engineering qualities beyond all As the 90 s drew to a close KEF introduced the Reference Series Model 109 The Maidstone Over thirty five years of technical excellence innovation in design and award winning engineering combined in one stunning loudspeaker Pictured Opposite KEF s acclaimed Reference Series 33 Mise The 2000 s The millennium ushered in a new era of groundbreaking audio innovation Among the most important was the launch of a new Reference Series the forerunner of today s design in 2002 This redefined the benchmark for high end loudspeakers by incorporating signature KEF technologies such as Uni Q and the pod concept The decade had begun with the introduc
17. hed Loudspeakers such as the Concord Concerto and Cresta and then in 1969 the Chorale began to shape the company s growing reputation as The Loudspeaker Engineers a fact justly recognized in 1970 when KEF received the first of two Queen s Awards for Export Achievement 29 The 1970 s By 1973 the company was developing the concept of computer assisted Total System design at a time when the world s very first 4 bit microprocessor was still in its infancy KEF engineers using a given set of parameters could for the first time actually see what the response characteristics of a loudspeaker system would be KEF was the first loudspeaker company in the world to take the new technology seriously in order to achieve this Now it was the use of computers and digital test methods which provided the KEF engineers with the relevant crossover and drive unit data at a glance thus dramatically improving their ability to produce loudspeakers of outstanding accuracy Amongst other benefits KEF loudspeakers could now be computer matched as an almost identical pair to within one half of a dB 1973 then saw the introduction of the first KEF Reference Series Model the 104 which swept reviewers distributors retailers and customers off their feet The archetypal domestic monitor 104 provided the standards of a broadcast monitor loudspeaker in a domestic package probably for the first time The Model 105
18. ies 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 lo
19. ing Further adjustment of this cable will allow connection of just two pairs of adjacent terminals together for Bi wiring and Bi amping es AMPLIFIER Loudspeaker single wire connections Loudspeaker bi wire connections Loudspeaker tri wire connections SA Centre loudspeaker single wire connections Loudspeaker single amplification connections SR R AMPLIFIER Centre loudspeaker bi wire connections 0 V Ed AMPLIFIER AMPLIFIER c Centre loudspeaker tri wire connections So AMPLIFIER AMPLIFIER 20 21 Centre loudspeaker single amplification connections Centre loudspeaker bi amplification connections ie AMPLIFIER Dco 2900 pes coe AMPLIFIER Ak e i s Loudspeaker Cables Poor quality cables can seriously compromise the overall sound of your hi fi system KEF recommends that high quality loudspeaker cable be used for connecting your Reference Series loudspeakers It is good practice to keep the cables as short as possible Grilles Dedicated grille assemblies are factory fitted to each loudspeaker However if you wish you may remove the grille by gently pulling it forward toward you The grille is held on via pegs that locate into the front baffle grille peg sockets or magnets which hold
20. into contact with the opposite terminal this could cause a short circuit between the terminals and may damage your amplifier Be aware that a higher quality run of cable will always give a more rewarding presentation than multiple runs of an inferior cable Amplifier Requirements and Power Handling In KEF literature and in the specification table within these instructions are listed a range of amplifier power outputs to match your Reference Series loudspeakers Conditions of use room size type of programme preferred listening level and the nature of the loudspeaker amplifier interface vary so widely that it is not possible to lay down hard and fast rules about amplifiers and the loudspeakers they drive KEF loudspeakers are built to rigorous standards of quality and consistency and the upper limits of the amplifier requirements shown are those which the loudspeaker in question should handle without distress or damage when used under normal domestic conditions If higher than specified amplifier powers are used great care should be taken to avoid abnormal conditions such as switch on surges or gross distortion either of the amplifier or the loudspeaker resulting in power peaks greatly in excess of the ratings specified Care should be taken as the possibility still exists under certain conditions such as excessive bass or treble boost caused by tone and or loudness controls graphic equalisers etc that the loudspeakers
21. lid engineering and innovation to provide the finest quality product available at its particular price point remained firmly at the bed rock In 1994 and 1995 the company brought out the versatile and appealing Q Series offering all the benefits of a third generation Uni Q driver but in a shielded format for AV use together with the multi award winning Model 100 Centre Loudspeaker the Model 90 the new Model 200C and the Reference Series Models One Two Three and Four KEF also introduced the new entry level Home Theatre System for true audiophile home theatre sound at a price to fit most pockets At the end of 1994 the company had quietly launched three loudspeakers that were to become one of the most spectacular stories in recent KEF history These were simply called Coda affordable loudspeakers that took the world s Press by SUCCESS storm the baby Coda 7 clinching the coveted UK Magazine What Hi fi s Best Buy Loudspeaker of the of the Year Award for 1995 KEF s founding father Raymond Cooke O B E sadly died during 1996 but with the knowledge that all of his original and noble principles remained intact and would always do so Recognition that year for the Reference Series Model Four had reached a peak with world wide acclaim Reviews by internationally famed and respected writers were quick to praise the merits of the company s new flagship model with its fourth generation Uni Q driver and to point out t
22. ls Within a year under Cooke s outstanding vision was planning loudspeakers with bass units using foil stiffened vacuum formed expanded polystyrene diaphragms and a Melinex or Mylar tweeter This idea was manifested in the an immediate success followed by the bookshelf model Celeste a loudspeaker with an even more significant commercial success and one that helped secure the early financial stability of the new company Re establishing a previous relationship with the BBC in 1966 Cooke was interested in adopting another material Neoprene an artificial rubber to help maintain sound quality in the mid band by using it as the surround to the loudspeaker diaphragm while using new materials for the diaphragm itself Cooke was always looking for new materials and settled on Bextrene as a solution as its lightweight plastic sheet like properties were flexible enough for shaping and the material remained stable under varying temperature and moisture conditions and was smooth and consistent over a wide bandwidth As a result in 1967 two new drive units the Sin BI10 and 8in B200 appeared which with their countless applications found use in some 3 million systems from KEF and many other loudspeaker brands throughout the world A new smaller tweeter also arrived the T27 which led to the most famous BBC KEF collaboration the LS3 5A of which some 100 000 units were sold world wide During the 19605 flouris
23. 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 lin 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 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 Ser
24. rated multimedia home entertainment system for consumers who want a complete user friendly package that offers quality sound without being complicated to set up One of the most revolutionary aspects of the design is that it delivers the apparently impossible a three dimensional surround sound image from only two loudspeakers This was achieved by adding two flat panel drivers behind each front loudspeaker driver to act as rear loudspeakers by radiating the sound behind the listening area This radical concept has since been applied to other KEF home entertainment products The launch of the new Q Series in 2005 further strengthened KEF s position as an acknowledged market leader in mid priced audiophile quality loudspeakers With its high performance Uni Q driver array distinctive curved cabinets and outstanding build quality and finish the new range was soon being referred to as the baby Reference Since then though the Reference has evolved further still True to our vision and roots as high end audio designers KEF engineers have been concentrating on raising the bar in terms of ultimate sonic performance And the result it has to be said is outstanding When the latest KEF Reference technologies were showcased at the prestigious High End 2006 audio show in Munich prototypes for our new Austin pictured opposite concept loudspeakers were voted by some the best sound of the show in independent comparative tests
25. ries loudspeakers are fitted with purpose designed gold plated Tri wire Tri amp terminals which will accept bare wire spade or 4mm connectors Most good quality loudspeaker cables have some indication such as colour coding or ribbing on the insulating material indicating which conductor is or positive Connection to the loudspeakers can then be made as follows The left channel amplifier output terminal marked or coloured RED connects to the left loudspeaker terminal marked The left channel amplifier output terminal marked or coloured BLACK connects to the left loudspeaker terminal marked Similarly these instructions should be followed for making connections between the right channel amplifier output and the right loudspeaker Correct polarity or phase is vital to the proper operation of the system If the connections are not made correctly the sound will deteriorate giving poor bass output and a diffuse presentation of the soundstage Bare wire connections are the simplest to achieve and involve stripping 12 5mm 1 2 of insulation to expose the loudspeaker wire core You should twist together using clean fingers the ends of each multi stranded core prior to the next stage to ensure a good signal contact Having unscrewed the lower terminal cap push the wire through the exposed hole in the terminal body and screw the cap down tightly Make sure that no stray strands come
26. s 50 300W Sensitivity 2 83V 1m 90dB Maximum Output 11548 Impedance 80 3 20 min Bass Extension 40Hz 6dB Weight 34 6Kg 76lbs Dimensions H x W x D 200 1100 x 425 mm 79 x 43 4 x 167 in Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore MODEL 206 2ds Design Closed box three way dipole loudspeaker magnetically shielded Drive Unit Array x 200mm 8in LF 2 x 165mm 6 5in Uni Q MF including 2 x 25mm lin titanium HF Frequency Response 15 horizontally off axis 3dB 65Hz 60kHz Crossover Frequencies 250Hz 2 3kHz Amplifier Requirements 50 200W Sensitivity 2 83V 1m 88dB Maximum Output 11048 Impedance 80 3 20 min Bass Extension 55Hz 6dB Weight 11 6 25 516 Dimensions H x W x D 324 x 400 x 200 mm 12 7 x 157 x 79 in Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore Photograph Martyn Goddard Courtesy Sunday Telegraph Colour Supplement KEF Heritage was founded in 1961 by an electrical engineer named Raymond Cooke in a Nissen Hut on the premises of a metalworking operation called Kent Engineering amp Foundry hence KEF on the banks of the River Medway near Maidstone in Kent From the beginning KEF was destined to become a company with a flair for the unusual and controversial in terms of loudspeaker engineering design and use of materia
27. s since its 1984 launch spawned the 107 in reality an evolution of the 105 2 but with KEF s coupled cavity bass loading a system which positions the drivers internal to the enclosure each separately loaded and firing into a third common chamber which delivers very tight and accurate bass to the listening area via a substantial front mounted port This combines the taut sonic character of a sealed box with the higher sensitivity of a reflex design and succeeds in providing a huge boost to bass performance Also came the 102 and the 103 3 both accepted by recording and broadcast engineers as ideal monitors KEF s reputation as loudspeaker engineers was set in stone As well as the coupled cavity bass loading system KEF Reference loudspeakers boasted such highly sophisticated features as a conjugate load network technique which makes even a complicated loudspeaker design simplicity itself from the amplifiers perspective and a heavily damped midrange module which preserves low coloration and fine stereo A force cancelling rod fitted between the vertically opposed bass units was an added introduction eliminating the possibility for coloration caused by woofer vibrations exciting the enclosure panels Amidst all this excitement 1988 also brought in the birth of the KEF Custom Installation loudspeakers a move made in response to new world market demands The same exacting engineering standards were naturally applied to the range an
28. 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 Adjusting the Feet and or Spikes 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 rigi
29. tanding loudspeaker magnetically shielded Drive Unit Array 2 x 200mm 8in LF x 165mm 6 5in Uni Q MF including a 25mm lin titanium HF Frequency Response 15 horizontally off axis 3dB 45Hz 60kHz Crossover Frequencies 400Hz 2 3kHz Amplifier Requirements 50 300W Sensitivity 2 83V 1m 90dB Maximum Output 11548 Impedance 80 3 20 min Bass Extension 35Hz 6dB Weight 33Kg 72 6lbs Dimensions H x W x D 1105 x 285 x 433 mm 43 5 x 112 I7 in Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore MODEL 203 2 Design Bass reflex three way floorstanding loudspeaker magnetically shielded Drive Unit Array 2 x l65mm 6 5in LF x 165mm 6 5in Uni Q MF including a 25mm lin titanium HF Frequency Response 15 horizontally off axis 3dB 50Hz 60kHz Crossover Frequencies 300Hz 2 3kHz Amplifier Requirements 50 200W Sensitivity 2 83V 1m 8948 Maximum Output 11348 Impedance 80 3 20 min Bass Extension 40Hz 6dB Weight 26 5Kg 58 3lbs Dimensions H x W x D 1020 x 248 x 405 mm 40 2x 9 8x 15 9 in Finishes Piano Black High Gloss Cherry High Gloss American Walnut Satin Sycamore MODEL 201 2 Design Bass reflex three way bookshelf loudspeaker magnetically shielded Drive Unit Array x 165mm 6 5in LF I x 165mm 6 5in Uni Q MF including a 25mm 1 titanium HF
30. the top Uni Q driver array grille If required the grilles may be removed during use but KEF recommends replacement following use Warranty Your KEF Reference Series loudspeakers are guaranteed against manufacturing defects in both materials and workmanship For further details of how this guarantee affects you please read the enclosed Warranty leaflet Service Information Loudspeakers are inherently reliable and rarely give trouble It is important to remember that faults arising in any part of the reproducing system will be heard via the loudspeakers and therefore when faults occur careful and analytical diagnosis will be required to locate the actual source of trouble Loudspeakers cannot generate hiss or hum Spurious noises of this type generally originate in the electronic sections of the equipment or even in the programme source itself Faults in a loudspeaker will be audible on all programme sources A fault which is evident only when playing CDs but not for example when using a radio tuner is unlikely to originate with the loudspeakers 22 23 The left and right channel loudspeaker cables should wherever possible be the same length otherwise there may be a perceptible change in output level between the loudspeakers KEF suggest removal of the grille for serious listening For cleaning purposes the grilles should be removed from the cabinets and brushed lightly with a soft brush Alternatively use a v
31. tion of a product destined to become a design icon in its own right the KHT KEF Home Theatre 2005 system With satellite loudspeakers nicknamed KEF eggs because of their distinctive elliptical shape KHT2005 represented a real breakthrough not only in terms of the build quality and sonic performance that it offered but at a price that many found very reasonable indeed With the rising demand for home entertainment systems the KHT series steadily grew to encompass both smaller and larger variants The concept proved a worldwide success with all models earning enthusiastic reviews and a plethora of awards and the expanded range remains popular today Another patented KEF innovation of the 215 century was Acoustic Compliance Enhancement or ACE This technology was developed in the constant quest to resolve a fundamental dilemma of loudspeaker design how to optimise the trade off between the large cabinet size required for maximum bass extension and popular demand for smaller less obtrusive loudspeakers in modern living rooms ACE largely succeeded in overcoming these conflicting constraints by adding granules of activated carbon inside the driver enclosures By a molecular process known as adsorption the presence of the granules makes each enclosure sound twice as big as it actually is 35 Yet more KEF innovations soon followed The KIT KEF Instant Theatre concept for example proved an immediate hit an integ
32. 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 Model 206 2ds 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 Model 204 2c 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
33. udspeakers 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 Model 207 2 The flagship of the new KEF Reference range Model 207 2 is designed to faithfully reproduce the full bandwidth and dynamics of music signals lt 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 Model 205 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
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