Bowers & Wilkins DM 640 User Manual

DM640

Floor-standing loudspeaker system

Product Summary

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The 600 series takes its place in a distinguished family tree that includes the world renowned Matrix 801 and the Matrix 802. Something of this superb pedigree was bound to rub off. In the same way that a luxury car benefits from racing technology, a 600 series loudspeaker speaker system brings with it the pleasure of acquiring the worlds leading acoustic expertise with inherent good value that will be music to your ears.

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The DM640 delivers unexpected power from this moderately sized speaker. Its 59-litre enclosure accommodates two 8in low frequency units, which utilise 56 litres of volume. The bass performance is further enhanced by the use of heavier Cobex cones in the lowfrequency drivers, delivering in the process a lower fundamental resonance frequency.

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Unique to the DM640 is a separate, acoustically isolated 160mm midrange drive unit mounted in its own sub-enclosure, By employing the B&W innovation of Kevlar for the cone material and relieving the unit of the need to reproduce high-excursion bass frequencies.

Technical highlights

B&W Loudspeakers Ltd reserves the right to amend details of the specifications without notice in line with technical developments. E & OE. All trademarks acknowledged.

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Description

Drive Units

3 way 4th-order variable port, bass reflex digital monitor system with bi-wiring 1 x 26mm high frequency with metal dome, high-temperature voice coil magnetic fluid cooling 1 x 160mm midrange with rigid die-cast chassis, Kevlar® diaphragm and 31mm high temperature voice coil on Kapton® former 2 x 200mm bass/midrange with rigid die-cast chassis, Cobex diaphragm and

Frequency Response

Sensitivity Nominal Impedance Power Handling

Dimensions

Finish

31mm high temperature voice coil on Kapton® former 46Hz – 20kHz ± 2dB on reference axis 91dB spl(2.83V 1m) 4 ohms 25W – 150W into 8 ohms on unclipped programme Height: 965mm Width: 236mm Depth: 407mm Simulated veneers of walnut or zelda

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An integral feature is magnetic fluid cooling which combats compression by reducing the temperature of the delicate voice coil in the tweeter at high frequencies.

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The practice of flush-mounting units into stylised moulded baffles has been implemented in the 600 Series. This, together with the bevelling of baffle edges, helps to fight diffraction and produce a cleaner sound. The front polymer compound baffles and the high density fibreboard sub-baffles combine to bolster the structure, and reduce radiation from mechanical cabinet vibration. This is further improved by internal bracing of the cabinet walls.

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The proven provision of being able to bi-wire or bi-amplify the system is present. Two sets of top quality, gold plated terminals are present to enable individual inputs for the high and low frequency units.