B&W DM-70

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)