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Bowers & Wilkins DM 640 Specification Sheet

B & w floor-standing loudspeaker system specification sheet
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DM640
Floor-standing loudspeaker system

Product Summary

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.
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 low-
frequency drivers, delivering in the process a lower fundamental resonance frequency.
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
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.
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.
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.
Description
3 way 4th-order variable port, bass reflex
digital monitor system with bi-wiring
Drive Units
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
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.
31mm high temperature voice coil on
Kapton® former
46Hz – 20kHz ± 2dB on reference
Frequency Response
axis
91dB spl(2.83V 1m)
Sensitivity
4 ohms
Nominal Impedance
25W – 150W into 8 ohms on
Power Handling
unclipped programme
Height: 965mm Width: 236mm
Dimensions
Depth: 407mm
Simulated veneers of walnut or zelda
Finish
www.bwspeakers.com

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