B&W electronics 70 User Instruction Handbook - page 23
-23-
It is our intention, towards the middle of 1970, to.
produce a free standing vertical styling for Model 70.
The line drawings in Fig. 12 and the half tone photograph
at the beginning of this release will provide a reasonable
indication of the final horizontal styling. A few additional
comments may however be helpful. The fabric covering the
main Bass Chamber is of an unusually interesting texture, of
a golden beige colour it matches well with the oiled teak or
American Walnut veneers. For reasons of safety the
electrostatic unit is sealed in a grounded expanding metal
cover but this has been anodised to colour match the fabric of
the main enclosure.
The proportions of the Bass Chamber and its leg assembly
minimise detraction effect and the height of the finished
loudspeaker system allows the electrostatic unit to be at ear
level when seated.
To assist movement on a carpeted surface and to distribute
the not inconsiderable weight the leg structure has a return
member which may be seen from the side elevation of Fig. 12.
Although fitting castors was contemplated it was found that
the centre of gravity was somewhat too high for stability.
Considerable attention has been paid to both enclosure
finish and construction. The main Bass Chamber is constructed
of 24 mm 650 density chipboard, veneered on both surfaces.
The cabinet is veneered on all surfaces including the back in
high guality matching veneers and the electrostatic top mount
and leg structure are also in matching veneers or solid timber.
RESPONSE CURVES, OSCILLOGRAMS AND FINAL MEASUREMENTS
The following reproduction of response plots and
oscillograms have been taken from a standard production sample
of the completed Model 70. They will serve to indicate the
performance of the complete system and illustrate aspects of
loudspeaker measurement discussed earlier in this release.