User manual B&W DM640 BROCHURE

[. . . ] DM640 Floor-standing loudspeaker system Product Summary q The 600 series takes its place in a distinguished family tree that includes the world renowned Matrix 801 and the Matrix 802. [. . . ] 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. q 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 q 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. q 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. q 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 31mm high temperature voice coil on Kapton® former Frequency Response 46Hz ­ 20kHz ± 2dB on reference axis Sensitivity 91dB spl(2. 83V 1m) 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 Nominal Impedance 4 ohms Power Handling 25W ­ 150W into 8 ohms on unclipped programme Dimensions Height: 965mm Width: 236mm Depth: 407mm 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. [. . . ]