Bowers & Wilkins DM 640 User's Manual
Contents
1. DM 640 Floor standing loudspeaker system Product Summary e 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 e The DM 640 delivers unexpected power from this moderately sized speaker Its 594litre enclosure accommodates two 8in low frequency units which utilise 56 litres of volume The bass performance is further enhanced by the use of heavier C obex cones in the low frequency drivers delivering in the process a lower fundamental resonance frequency e Unique to the DM640 is a separate acoustically isolated 160mm midrange drive unit mounted in its own sub enclosure By employing the B amp W innovation of Kevlar for the cone material and relieving the unit of the need to reproduce high excursion bass frequencies Technical highlights e 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 e 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 f2. ight 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 e 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 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 x 160mm midrange with rigid diecast 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 ormer Dimensions Height 965mm W idth 236mm 2 x 200mm bass midrange with rigid Depth 407mm die cast chassis Cobex diaphragm and Finish Simulated veneers of walnut or zelda B amp W LISTEN AND YOU LL SEE B amp W Loudspeakers Ltd reserves the right to amend details of the specifications without notice in line with technical developments E amp OE All trademarks acknowledged www bwspeakers com
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