Bowers & Wilkins DM 309 User's Manual
Contents
1. Loudspeakers Ltd Meadow Road Worthing BNI 1 2RX England Me 44 i01 1903 524801 Fax 44 1903 52427925 www hwsnenkers cam in line with technical developments E 915 0588012. 1 5m apart fo maintain leftright separation e Keep the speaker at least O 5m clear of walls Stray magnetic fields The speaker drive units create stray magnetic fields that extend beyond the boundaries of the cabinet We recommend you keep magnetically sensitive articles television and computer screens computer discs audio and video tapes swipe cards and the like at least O 5m from the speaker CONNECTIONS figure 3 All connections should be made with the equipment switched There are 2 pairs of terminals the back of the speaker which permit bi wiring if desired On delivery the separate pairs are connected together with high quality links for use with single 2 core cable For single cable connection leave the links in place and use either pair of terminals on the speaker Ensure the positive terminal on the speaker marked and coloured red is connected to the positive output terminal of the amplifier and negative marked and coloured black negative Incorrect connection can result in poor imaging and loss of bass To bi wire remove the links by loosening the terminal caps and use a separate 2 core cable from the amplifier to each pair of terminals This can improve the resolution of low level detail Observe the correct polarity as before When bi wiring incorrect connection can also impair the frequency response The terminals accept 5mm spades bared wire ends
3. DM 307 Owner s Manual OQ CO 309 TOI CH 7 PMG Owner s manual 10 11 14 15 16 18 Svensk wooo kO Nederlands POMS 19 gt C lt Figure Figure 2 Figure 4 ENGLISH INTRODUCTION Thank you for choosing Bowers amp Wilkins We are contident that you will enjoy many years of listening pleasure from your speakers but please read this manual fully before installing them It will help you optimise their performance B amp W maintains a network of dedicated distributors in over 60 countries who will be able to help you should you have any problems your dealer cannot resolve UNPACKING figure 1 e Fold the carton flaps right back and invert the carton and contents Lift the carton clear of the contents Remove ihe inner packing from the product We suggest you retain the packing for future use Check in the carton for foam plugs 4 spike feet with lock nuts POSITIONING ligure 2 Do not fit the spike feet until you have found the best position for your speakers As an initia guide Position the speakers and the centre of the listening area approximately at the corners of an equilateral triangle Keep the speakers at least
4. all changes in the position of the speakers or the listeners can have a profound effect on how these resonances affect the sound Try mounting the speakers along a different wall Even moving large pieces of furniture can have an effect If the central image is poor try moving the speakers closer together or toeing them in so they point at or just in front of the listeners figure 2 If the sound is too harsh the amount of soft furnishing in the room for example use heavier curtains or reduce it if the sound is dull and lifeless Test for flutter echoes by clapping your hands and listening for rapid repetitions Reduce them by the use of irregular shaped surfaces such as bookshelves and large pieces of furniture Ensure the speakers stand firmly on the floor Whenever possible fit the spike feet supplied alter you have optimised the positioning They are designed fo pierce through carpeting to the floor surface Initially screw the lock nuts fully onto the spikes and screw the spikes fully into the threaded inserts in the base of the speaker If the cabinet rocks unscrew the appropriate spikes until the speaker stands firmly on the floor and lock them in place by tightening the lock nuts against the base If you do not have a carpet use a protective disc under the spikes to protect the floor surface AFTERCARE The cabinet surface usually only requires dusting IF you wish to use an aerosol cleane
5. or round pins up to 5mm diameter and 4mm banana plugs When using spades fit them under the sliding collar Important safety notice In certain countries notably those in Europe the use of 4mm banana plugs is considered a potential safety hazard because they may be inserted into the holes of unshuttered mains supply sockets In order to comply with European CENELEC salety regulations the 4mm holes in the ends of the terminals are blocked by piastic pins Do not remove the pins if you are using the product where these conditions apply Always screw the terminal caps down tightly to optimise the connection and prevent rattles Ask your dealer advice when choosing cable Keep the total impedance below the maximum recommended in the specification and use a low inductance cable to avoid attenuation of the highest frequencies FINE TUNING Before fine tuning double check that all the connections in the installation are correct and secure Moving the speakers further the walls will reduce the general level of bass Space behind the speakers also helps to create an impression of depth Conversely moving the speakers closer to the walls will increase the level of bass you want to reduce the bass level without moving the speakers further from the wall fit the foam plugs in the port tubes figure 4 If ihe bass is uneven with frequency it is usually due to the excitation of resonance modes in the room Even sm
6. r remove the grille first by gently pulling it away from the cabinet Spray onto the cleaning cloth not directly onto the cabinet The grille fabric may be cleaned with a normal clothes brush whilst the grille is detached from the cabinet Avoid touching the drive unit diaphragms especiolly the tweeter as damage moy result Technical features Description Drive units Frequency range Frequency response Dispersion Sensitivity Harmonic distortion Nominal impedance Crossover frequency Recommended amplifier power Max recommended cable impedance Dimensions Net weight DM 309 Nautilus tweeter Fiowport 2 vented box system ix e25mm 1 alloy dome high frequency 1 el 30mm 0 woven fibreglass cone bass midrange 1x ei 30mm woven fibreglass cone bass 6dB at 4 and 42kH 60Hz 22kHz on reference axis Within 2dB of reference response Horizontal over 40 arc Vertical over 10 arc 88dB spl 2 83V 1m 2nd and 3rd harmonics 9OdB ini 126 90Hz 20kHz minimum 3 09 1 50Hz 4kHz 25W 120W into 8Q on unclipped programme 2 442 Height 9 1 Omm 135 8 Width 201mm 7 9in Depth 305mm 12in LISTER AND YOULL B amp W Loudspeakers reserves the right nd i the specification without notice ij i ttd Printed in England amp OE gt
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