DM 640

About the DM 640

Manufactured between 1991 and 1993 in England, the Bowers & Wilkins DM 640 is a high-performance 3-way bass reflex floorstanding speaker. It features two 200mm bass/midrange drivers with Cobex cones, a 160mm Kevlar fabric cone midrange driver mounted in an acoustically isolated sub-enclosure, and a 26mm metal dome tweeter with magnetic fluid cooling for reduced compression and enhanced high-frequency performance. The speaker has a frequency response of 46Hz to 20kHz (±2 dB), sensitivity of 91 dB (2.83 V, 1 m), and an impedance of 8 ohms (minimum 4 ohms). It is designed to be driven by amplifiers rated between 25 and 150 watts. The cabinet dimensions are 965 mm high, 236 mm wide, and 407 mm deep, weighing approximately 24 kg. The enclosure is constructed with polymer compound baffles and internal bracing to minimize resonance and vibration, and it supports bi-wiring or bi-amplification via two sets of gold-plated terminals. The finish options include Black Ash and Walnut Vinyl. Originally priced around 3200 Deutsche Marks per pair, the DM 640 is noted for its smooth, full-bodied sound and accurate stereo imaging, making it a respected model in B&W's 600 series lineage.