Bowers & Wilkins DM1600 User's Manual
Contents
1. Il II ul III ill 4 om c o will i a gt x sl DM1600 Instruction Manual DM1600 amp DM1500 The brief to our design team for the DMI60ODM1800 envisaged two loudspeaker systems of medium size incearporating all the benefits of our new Matrix technology There was an additional challenge the two new systems must be even more cost effective than the anginal Matrix monibars 1 2 amp 3 High sensitivity 89 608 for 1W input was another prime requirement Also we called for enclosures of modest dimensions and this was to be achieved while maintaining extended bass response To measure up successfully to such exacting require ments calls for high technology research programmes such ss B amp W are uniquely well manned and equipped to carry out To quote two interesting examples 1 finite element analysis of diaphragm behaviour was Used in the design of transducers which behave as true piston radiators throughout their operating range and 2 modal analysis was the guide for optimum positioning of cabinet Matrix elements Complamentary with this high tech approach to component design was the decision by consultant Or Kenneth Grange of Pentagram to mould the front battle indime filled polypropylene which makes Hs on contribution to acoustic superiority The enclosures of both models are finished in selected genuine wood veneers Matching stands are available2. But note that lew frequency performance has been tallored to ensure that shelf mounting is perfectly acceptable Because the systems are protected by the patented B amp W aucdio powered overload circuit APOC high listening levels do not ental the risk of damage te drive units Getting the best from your system The purpose of this manual is to enhance your enjoyment of the DM TSQO TM TBO loudspeakers you have chosen Systema of this high class are still dependent on the signals fed Into them ond are also influenced by the Immediate anvironment mhich they opsrate Jseful advice on these aspects vill be found in the following pages Aninternational network of carefully chosen distributors handies EBAY products in more than forty countries worldwide Hat ann time vou have a problem that your Dealer cannot resote the BAW Distributor for your area will be more than willing to help Thank you for the confidence you have shown in purchasing your DM1I6G00 DM1800 loudspeakers Please bo assured of our continuing interest in your long term listening pleasure amp W DM1600 DM1800 design background The enclosure Drawing on our recent experiance with the invention develop ment and outstanding success of the B amp W Matrix series we designed the DM1600 0DM1800 enclosures with all the following proven advantages bullt in a Significant reduction of those unwanted colourations So Tregquently associated with bo Type loudsp
3. limits of RMS power output for the driving amplifier are 30W min Z00W max into BQ It should be stated that amplifier power output Is impossible to quote precisely as it depends to some extent onthe type of music being reproduced Similarhy the required ampliar power ill depend on room volume and the sound level required by the listener itis generally true to say that too high a power output is better than too low because it allows more headroom for transients and reduces the risk of clipping with its attendant sharp rise in distortion ESA established their own electronics research department for the express purpose of in depth research habe active loudspeakers protection amplifiers test equipment and other items of slectronics A range of electronics specifically designed to camplement the performance of your loud speakers will be an the market shortly We suggest you ask your Dealer for a comparative demonstration of these products he APOC protection circuit The DMi60o DMIBOO systems are fully protected against excessive signal levels As soon as the safe limit ofany given drive unit is approached the protection circuit willdisconnect the input until the fauitfoyvenoad is arrondi oudspeaker accessories Hore we comment briefly on three accessories associated with loudspeakers stands spikes and cables Apurpose made stand is available which rigidly supports DM1600 0M1800 et optimum listening height it was designe
4. ba ce incorporating a metal domed diaphragm It exhibits perfect piston like behaviour up to frequencies weil beyond audibility This unit IS the result of advanced research using established BEA laser techniques plus the new science of finite element analysis which can predict driver performance permitting many more options to be assessed than if each had te be built and tested Filter networks and protection circuits Just as the drivers required refinement te accord with improvements in enclosure design S0 care was needed to ensure that the crossover filttenng ould maintain overall system performance The quality and tol rance of components had ta be controlled to fine mits inonder to meet the high standards of distortion and linearity we set Unpacking We suggest that after unpacking your loudspeakers you retain the packing against the possibility of wishing to transport them at a later date The loudspeaker cartons contain DNMi600 one carton a A pair of DM 1600 loudspeakers ib One copy of this instruction manual ich Tewo calibration certificates ane for each loudspeaker DMIBOO two cartons Ineach carton a One OM1800 loudspeaker andin one carton only oi One copy of this instruction manual ic Twecallbration certificates ore for each loudspeaker Installation The rear of each DM1600 DMi16800 enclosure is fitted with a pair of serow terminals marked red for positive and black f
5. d by Kenneth Grange to integrate perfectly with either enclosure In use the stands positively enhance the look of the speakers and blond pleasantly with furniture and furnishings The loudspeakers incorporate stand locating sockets and full fitting instructions are inciuded with the optional stand kit Spikes supplied with the stand can assist sound reproduction in two quite different ways Firsty due to their extremely small area of contact relative to the stand basa their interface provides many thousands of times greater pressure at the point of contact This increases the stability of the loudspeaker and helps withstand any movement of the enclosure due to sound excitation The second way in which spikes can assist is by reducing the area of contact between floor and loudspeaker enclosure This is especially valuable in the case of a resonant floor which may be regarded as a giant sounding board coupled ta the cabinet Two areas of improvement in sound reproduction will be noticed when spikes are fitted Bass transients will be tighter and stereo images will be slightly more precise due ta the increased stability of the system The subject of cables between the power amolifer and loudspeakers is dealt with under Section 3 installation There remains the question of interconnecting cables between the various pleces of equipment and the power amplifier A number of excellent cables are available on the market and aucible differences cer
6. eakers Ar radiation from an enclosure adds tts avn unwanted character to the desirable neutral uncoloured sound produced by the drive units Reduction of the decay time of enclosure vibrations with consequent improvement in transient response a key factor In correct reproduction of compact discs Improved detail and depth in the stereo image dua to reduction of image contusing rear and sideways radiation The sounds seem to be in the space around and between the speakers not emanating from them The drive units The reduction of enclosure radiation to extremely low levels has the unfortunate side affect of axposing hitherte inaudible defects in driver performance it was therefore necessary to carry out extensive development of drivers refining thelr performance in order to take full advantage of the new Matrix technology The cone of the bass midrange driver that resulted ftom this development programme Is made from a specially formulated plastic compound Critical parameters of the motor system and cone mass have bean ontimised for the chosen fourth order vented aliqnment A similar design philosophy is behind the drive units ofboth systema but in the cage of DM1I800 our computer Sided design programmes called for a motor system with considerably more power This gives worthwhile bass extension and the increased voice coil diameter results in enhanced power handling The high frequency transducer is of antirely new design t
7. ecording the equipment used for reproduction and the asoustie properties of your listening room Regardless of other links in the chain the listening room Will boa greater or lesser degree imprint its character on the reproduced sound you hear in simple proof of this statement notice haw the sound of the human voice changes according to environment Choice of listening room Few people are fortunate enough to have a choice of listening rooms but for those t whom this Is possible or anyone planning a new home the following may be helpful guidelines a Any room with different dimensions for ceiling height length and width will sound more even in response than rooms where all three dimensions are similar Solid walls are preferable and vill show better repro duction of low frequency transients than somemodern constructions where the inner walls are of plasterboard and therefore slighth flexible Other than in houses with solid or concrete floor Structures s ground floor room is preferable to an upper floor fb fc Changing listening room acoustics Quite small changes in the furnishing of a room can affect its acoustic properties significantly If you already have pictures on the wall remove these experimentally and at once you Will notice a considerable change in the sound from your loudspeakers We are not suggesting that you should leave the room bare of pictures quite the reverse because Pictures break up the otherwi
8. or negative These should be connected to your amplifier and OuUtpUES respectively using a good quality cable Since the Currents involved when playing loud music can be large itis recommended thatthe cable cross sectional area should be notless than 1 5mm for runs up to 3 metres and correspondingly larger for longar runs Later sections deal with positioning your loudspeakers se of stands and ancillary equipment Aftercare The DM1600 DM16800 baffle is finished in Nextel Consequently the greatest care should be taken to ensure that any cleaning is clone without the use of abrasive materials A soft damp cloth should be all thats necessary to clean the paintwork Proprietary polishes such as car polish are not recommended The cabinet ls finished in real wood veneer and should betraated inthe same way as you would treat a normal piece of furniture However if you use an serosal please spray on to a piece of cloth first in order to avoid the application of polish to the grilles The grilles may be cleaned after first removing them by brushing with a soft clean clathes brush or something similar Plosse avoid touching the drive units especially the dome tweeter as damage could result he listening room and positioning FF your loudspeakers The degree of accuracy with which the original musical performance can be reproduced in your avn home depends on a number of factors including the quality af the original r
9. se plain wall surfaces and generally give fewer discrete high frequency resonances or flutter schoss Curtains are another element which can change the sound of your listening room inthe mid upper frequencies Heavier curtains give more sound absorption of these frequencies and a softer less reverberant quality to the upper octaves Conversely if your room sounds too dead thinner curtains weil give more life or sparkle in these frequency regions So far ss sound in the low frequencies ls concerned this is largely controlled by the dimensions and construction ofthe room However large items of furniture do change room behawiour at low frequencies so it may be worth experimenting with their placement Placement of loudspeakers There is some truth in the notion that cheap loudspeakers correctly placed may sound better than more expensive ones poorly placed While this is a somewhat simplistic idea it is certainiy true that the position of your loudspeakers within your orvironment will have a greater effect than any other variable under your contra Models DMIGOWDMIBOO are designed te fit into as many different situations as possible and they wil function success fully standing on shelves or furniture However we do recommend the use of our purpose made stands which place the drivers at the correct height in relation te most seating arrangements see Section Tj mplifier control unit and source equipment The recommended
10. t 308 sown at 5043 GSH2 2OKHz 248 free field Horizontal 40 are 0 24B Vertical 10 arc L5aB For S546 at 1m Second harmonic SIE 2042 2000 1 200Hz 20kKHz Third harman c IA 20H7 200H7 lt 14 20020 Fourth order Butterworth squared acoustic response crossing over at 3KHz ve Nominal 802 not falling below 6 amp 2 One 200mm polymer cone bass madrange One 26mm metal dome high frequency with trust piston schon up to 20kHZ Suitable for amplifers of 30 200 Automate overioad protection APOC Reght 634mm 2sin Width 236mm ain Depth 300mm LL inc grile Real wood veneers of black ash or walnut BG Leudsipsakern Lod reserves the right to amend details of thelr specications in fife wath C chenic al dewaloprnar a BG arbre Le a trademark of AGW Lolcepeakere Lie i Copynght BEW Loudspenkers Lie
11. tainly exist boten them We suggest therefore that you choose one of the better cables for this purpose after consid ration of the published reports With your DMI600 DM1B00 system you will find that you are noticeably nearer to istening te the music rather thanto the joudspeakers You will hear desirable ambience and detail in good recordings unfortunately the faults in poor recordings Well also be revealed We have produced a special compact disc recording that will enable you toenjoy a full apprecatior of your new system It is available from your Dealer Ba label Na BON BSW Present The Academy of Ancient Music Christopher Hogwood impedance Drive units pecifications 648 points SCHZ AUKHE 308 down ai ESHT 7OHe 20kHz 208 fme fieid Horizontal 40 arc 0 208 Vertical 10 arc 1608 S9dB at Len for IW into BQ For SB at Im Second harmonic lt 3 20K 200Hz 1 200H2 20hHz Third harmonic lt 3 20Hr 200Hz 1 200H2 20kHz Fourth ceder Butterworth Squared acoustic response crossing over al 3kHz Nominal SG net falling below GC Une 200mm polymer cone bass midrange piston action up to 20kHz Suitable for amplifiers of 30 200W Haight 490mm 192 Widhe 236mm un Depth 300mm liver inc are GO at Im for ine BOD impedance Drive units Power handling Dimensions finish zur zum Real wood vereers ol back ash or walnut 6dE points 43H2 3OkH2 Fourth order vented alignmen
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