Bowers & Wilkins 640 specifications 6 4, Technical highlights

D M 6 4 0

F l o o r - s t a n d i n g l o u d s p e a k e r s y s t e m

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		31mm high temperature voice coil on
	digital monitor system with bi-wiring		Kapton® former
Drive Units	1 x 26mm high frequency with metal	Frequency Response 46Hz – 20kHz ± 2dB on reference
	dome, high-temperature voice coil		axis
	magnetic fluid cooling	Sensitivity	91dB spl(2.83V 1m)
	1 x 160mm midrange with rigid die-cast	Nominal Impedance	4 ohms
	chassis, Kevlar® diaphragm and 31mm	Power Handling	25W – 150W into 8 ohms on
	high temperature voice coil on Kapton®		unclipped programme
	former	Dimensions	Height: 965mm Width: 236mm
	2 x 200mm bass/midrange with rigid		Depth: 407mm
	die-cast chassis, Cobex diaphragm and	Finish	Simulated veneers of walnut or zelda

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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