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Summary of Contents for B&W electronics dm70
- Page 1 B&W DM70 Instruction manual test certificate and guarantee...
- Page 2 DM70 B&W D M . Trade mark of B&W electronics...
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Page 3: Table Of Contents
Contents Page General Description The Listening Room Installation — unpacking and connection Installation — Siting Ancillary equipment Specification B&W electronics Meadow Road • Worthing England -BN11 2RX... -
Page 4: General Description
For an explanation of unpacking and assembling your loudspeakers (each DM70 system, excluding stands, is packed in t w o cartons) refer to section 3 of this booklet. In common with all B & W loudspeaker systems, the DM70 is subjected to stringent, quality control through every stage of manufacture and dispatch. -
Page 5: The Listening Room
As a result of research carried out into the " r o o m g a i n " and how this affects loudspeaker performance, the stand of the DM70 has been specifically designed to give optimum results over a range of listening conditions. - Page 6 The ideal is a solidly built ground floor room with a concrete floor. In rooms where there is a board and joist floor this will play a part in both adding to bass gain and room colouration. The suspended floor acts as a supplementary bass radiator operating at the main resonance of the room.
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Page 7: Installation - Unpacking And Connection
Mains. Before attempting to connect the mains supply to your DM70 check that your supply voltage agrees with the adjustment made to the system before it left our factory. - Page 8 Fig. 1 Rear view of Continental power supply, showing label indicating the power supply voltage. The power supply for the Standard version is similar but rotated through 90 degrees. The regulation of the power supply is such that, normally, no adjust- ment will be necessary and the unit is set for the country of destination, e.g.
- Page 9 To remove the power supply unit from the cabinet, unscrew the four screws at the side of the rear panel of the unit and withdraw it, un- plugging the audio output to the bass unit. (If the 701 electrostatic unit has already been fitted to the cabinet, it will be necessary first to remove this, by reversing the assembling instructions which follow.) The various adjustments to the mains voltage selector are self- explanatory.
- Page 10 It is advisable to keep the series resistance of connecting cables as low as possible by using reasonably heavy gauge cables. Our recom- mendations are.— Loudspeakers under 10 metres away from amplifier: use 16/0.2mm. Loudspeakers over 10 metres away from amplifier: use 24/0.2mm.
- Page 11 DM70 at very high sound levels, or where high powered continuous sine wave inputs are applied, the rear absorbent pad should be placed in position. It will be observed that on the rear panel of the Power Unit there is a neon indicator.
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Page 12: Installation - Siting
DM70 than with most conventionally designed loudspeakers. Example of sitings of a pair of DM70's and a pair of conventional Loudspeakers are illustrated in figure 3. Fig. 3 Listening area shown hatched in. - Page 13 The governing factors are the distance between the loudspeakers and the distance of the listeners from them. Considerable latitude is offered in the case of the DM70, but, as a general rule, the angle by which they should be turned is increased...
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Page 14: Ancillary Equipment
DM70 is capable of ex- tremely faithful reproduction, provided that the signal fed to it is of the very highest quality. A monitor loudspeaker — and the DM70 is such a high-quality system — is therefore analytical and will reveal faults in ancillary equipment and programme material which could well be masked by an inferior loudspeaker. -
Page 15: Specification
Specification General Description B. & W. D M 7 0 is a h y b r i d design employing exclusive Model 701 11-element wide dis- persion doublet electrostatic unit (patent no. 1239658), DW 13/70 high power low distortion moving coil bass unit w i t h com- plex crossover and filter unit and dividing network. - Page 16 Electrostatic Unit model A prime design point of the 701 is that it is The " S t a n d a r d " version of the cabinet is available in teak or walnut veneers and a free-standing. This makes it possible easily choice of walnut veneer or satin white finish to remove the unit in the event of damage for the "Continentals."...
- Page 17 STANDARD Dimensions. Weight: Weight w i t h stand: 4 5 . 4 k g . (100 lbs) Standard Overall Height (on Stand) 31 i " (808 mm) Overall Width 3 2 " (815 mm) Overall Depth 1 5 " (382 mm) CONTINENTAL Continental...
- Page 18 Frequency Response. On-Axis ± 5 dB. 60 Hz. to 15kHz. On axis response of a production sample DM70 taken in Ft & D Anechoic Chamber. B & K equipment used throughout, w i t h type 4133 microphone at 1 metre.
- Page 19 20 Hz to 9 k.Hz., the impedance m i n i m u m occurring in a frequency region of very low music energy. Plot of impedance of production sample of DM70. Distortion. Harmonic analysis plotted against frequency Content of 2nd. and 4th. Harmonics.
- Page 20 Transient Response. Tone Burst oscillograms taken at one-third octave intervals in ou Research Anechoic Chamber. Microphone type B & K 4133. 31.5 Hz 40 Hz 50 Hz 63 Hz 80 Hz 100 Hz 125 Hz 160 Hz 200 Hz 250 Hz 315 Hz 400 Hz 500 Hz...
- Page 21 Polar response Polar response 1 k.Hz. 100 Hz Polar response Polar response 10 k.Hz. R k H ?
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