Bowers & Wilkins DM 640 - Manual

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
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.
www.bwspeakers.com
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
● 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.