B&W DM 70 /Continental
Product Summary
The DM70 is new
thinking on acoustical distribution pattern especially within the vitally
important mid-frequency region of 400Hz to 5kHz, aiming towards exploring the
advantage of an approximately spherical distribution pattern.
All units are
designed and built within our factory to ensure maximum quality control and
retention of the exclusive original design
The styling and
general appearance has been designed to be acceptable in the world market,
resulting in the Standard and Continental versions each available in various
finishes.
Technical highlights
A mid-frequency unit
capable of handling input powers in the region of 35Watts RMS with distortion
factors to the order of 0.5% or lower.
The bass radiator is
capable of truly complementing acoustical distribution and power handling
without occupying an unduly large enclosure volume.
Electrostatic mid
and HF unit
This is an eleven
module doublet electrostatic unit covering all frequencies above 400 Hz. It's
unique polar distribution pattern both improves stereo stability and increases
the ratio of reverberant to direct sound. The pattern is virtually circular in a
vertical plane through mid-band frequencies, providing a very wide, uniform
arc.
Bass Unit
Bass frequencies are
handled by a unit with a nominal 12 in (305 mm) piston diameter, chosen as
being reasonably consistent with the enclosure volume to build a system with a
resonance below 40 Hz , and a free air resonance in the region of 18 - 22 Hz.
The cone assembly
consists of a laminated structure providing the stiffnes requiered to avoid
break-up, and is additionallly braced and mass adjusted by small rectangular
sections of synthetic rubber fixed at critical positions on the front face of
the cone.
The massive magnet
assembly ensures excellent damping and handling of transiants without hangover.
Bass Chamber
This is an infinite
baffle type, with complex internalabsorbents making it almost aperiodic.
Considerable attention has been paid to both finish and construction, the
enclosure is acoustically inert, being built of 24 mm of 650 density chipboard
and heavily braced.
B&W DM 70
Standard
Specifications
Type: Stand-mount loudspeaker system
Acoustic Load:
Bass unit : Infinite
Electrostatic unit :
Free standing with removable pad to control rear radiation pattern
Drive Units:
Electrostatic mid
& HF unit covering all frequencies above 400Hz
305mm piston
diameter bass/midrange unit
Axial response: 90° arc horizontal within ±2 dB an axis
response at all frequencies up to 15 kHz
Frequency
Response: 50 Hz to 15 kHz, ±4 dB
Crossover
Frequency: Nominally 400 Hz
Total harmonic
Distortion: 1,1% at 1 kHz
Sensitivity: 95 dB at 1 metre
Nominal
Impedance: 8 ohms
Power Handling: 25 W
System
Resonance: 40 Hz ±1% (System Q below
unity in the order of 0,9)
Dimensions:
Standard Model
Height : 808 mm
(including stand)
Width : 815 mm
Depth : 382 mm
Finish : Walnut or
Teak
Weight: 50,8 kg (112 lbs)
Continental Model
Height : 820 mm
Width : 680 mm
Depth : 390 mm
Finish : Walnut and
white
Weight: 36,3 kg (80 lbs)