INTRODUCTION
Thank you for purchasing the B&W CDM™1NT speakers.
Founded in 1966, B&W has always striven for perfect sound reproduction in its products. To this end, the company has invested heavily in research and development in order to maintain its position at the forefront of acoustic design. Through the years, B&W has introduced many advanced features and techniques. Although many of these have been developed initially for the more expensive models, our “waterfall” design policy has seen them incorporated, wherever possible, elsewhere in the product range.
Features to be found in the CDM™NT Series include cabinets with contoured edges to reduce sound diffraction (the radiation of sound waves from sharp edges that interfere with and blur the direct sound from the drive units). An integral part of the CDM™NT range is the use of Kevlar® cone bass/midrange drive units for lowest coloration and maximum definition. The treble units incorporate Nautilus™ tube technology, which eliminates resonances behind the dome diaphragm.
It is important to spend time setting up the speakers, as care spent on the installation process will reap the reward of many hours of listening pleasure. Reading this manual fully will help you obtain the best from your audio system.
B&W distributes to over 65 countries worldwide and maintains a network of dedicated distributors who will be able to help should you have any problems your dealer cannot resolve. Their mailing addresses can be found on the web site or by calling B&W direct.
UNPACKING
(Figure 1)
•Fold the carton flaps right back and invert the carton and contents.
•Lift the carton clear of the contents.
•Remove the inner packing from the product. We suggest you retain the packing for future use. Check in the carton for:
•2 Foam bungs.
•8
•1 International warranty booklet.
POSITIONING
(Figure 2a)
Mount the speakers on firm dedicated stands that place the tweeters approximately at ear level. Bookshelf mounting is possible but alows less opportunity for optimising the sound. The shelf or stand used will affect the sound quality of the speaker. The B&W
As an initial guide:
•Position the speakers and the centre of the listening area approximately at the corners of an equilateral triangle.
•Keep the speakers at least 1.5m apart to maintain
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 0.5m from the speaker.
CONNECTIONS
(Figure 3)
All connections should be made with the equipment switched off.
There are 2 pairs of terminals at the back of the speaker which permit
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) to negative. Incorrect connection can result in poor imaging and loss of bass.
To
Ask your dealer for 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, make sure that all the connections in the installation are correct and secure.
Moving the speakers further from 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.
If you want to reduce the bass level without moving the speakers further from the wall, fit the foam bungs in the port tubes.
(Figure 4)
If the bass is uneven with frequency it is usually due to the excitation of resonance modes in the room. Even small 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 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 just in front of the listeners. (Figure 2b)
If the sound is too harsh, increase the amount of soft furnishings 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 speaker stands are firm on the floor. If you have a carpet, use
RUNNING-IN PERIOD
The performance of the speaker will change subtly during the initial listening period. If the speaker has been stored in a cold environment, the damping compounds and suspension materials of the drive units will take some time to recover their correct mechanical properties. The drive unit suspensions will also loosen up during the first hours of use. The time taken for the speaker to achieve its intended performance will vary depending on previous storage conditions and how it is used. As a guide, allow up to a week for the temperature effects to stabilise and 15 hours of average use for the mechanical parts to attain their intended design characteristics.
AFTERCARE
The cabinet surface usually only requires dusting. If you wish to use an aerosol cleaner, remove the grille first buy 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 units, especially the tweeter, as damage may result.
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