NRPavs   SOLD items 2017 archive 1  B&W  DM620  speakers  details
SOLD items 2017 archive 1 product details : 
Bowers & Wilkins  B&W DM620
front  speakers

Bowers & Wilkins B&W DM620  speakers  :  front  view
Bowers & Wilkins B&W DM620  speakers  :  right  profile

Bowers & Wilkins B&W DM620  speakers  :  drivers  closeup
Bowers & Wilkins B&W DM620  speakers  :  backs  view

Bowers & Wilkins B&W DM620  speakers  :  left  top  view
Bowers & Wilkins B&W DM620  speakers  :  size  scale  - grilles  on
   SOLD May 2017 on trademe  to Silverdale, Auckland
S/Ns: 019352 / 019480
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   B&W  DM620  speakers  - black / grey :
      The DM620 is an entirely ‘in house’ product (apart from the cabinet) and in addition is one of the few B&W designs to use a passive radiator, sometimes known as an ABR (auxiliary bass radiator)
   This is basically a specialised example of a reflex design which substitutes an additional unit with a normally suspended diaphragm, but no voice-coil or magnet, in place of the more usual air mass retained in a pipe or tube;
   - in doing so it avoids possible pipe resonances, puffing noises from the considerable to and fro air motion and, most importantly, effectively shuts off unwanted audible contributions from inside the box
   The bass/midrange driver and the ABR have much in common in this B&W design, both using identical die-cast chassis, cones and suspensions, but in the latter the voice-coil has been replaced by a weight

   Some grille frame section repairs, tested OK,   now released :

Specifications :
  -:®:-   Vintage : 1991 model
  -:®:-   System type : Floor standing, two-way with passive bass radiator loudspeaker
  -:®:-   Bi-wiring / biamplification facility
  -:®:-   Drive units : One 200mm [8"] bass/mid with rigid diecast chassis, reinforced polypropylene diaphragm and 31mm [½"]high temperature voice coil on Kapton former,
  -:®:-   One 26mm [1"] high frequency with metal dome, high temperature voice coil and magnetic fluid cooling,   One passive bass radiator with long throw capability
  -:®:-   Frequency range : 44Hz and 30kHz [-6dB]
  -:®:-   Frequency response : 58kHz to 20kHz [±2dB]
  -:®:-   Reference Axis : Horizontal 605mm from bottom of cabinet
  -:®:-   Dispersion : within ±2dB of response on reference axis 20Hz to 15kHz,  Horizontal over 40° arc, Vertical over 10° arc
  -:®:-   Sensitivity : 90dB [2.83V / 1 metre]
  -:®:-   Impedance : Nominal 8 Ohms
  -:®:-   Crossover frequency : 3kHz
  -:®:-   Internal volume : 30 litres
  -:®:-   Power handling : suitable for amplifiers 25 to 100 Watts
  -:®:-   Dimensions [H x W x D] : 742 x 236 x 302mm
  -:®:-   Weight : 14.2kg  - packed 16kg each

   SOLD May 2017 on trademe  to Silverdale, Auckland


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