CBT36K Assembly Manual
Page
80
of 89
14.1.15.
CBT36 Ground-Plane Frequency Responses:
The CBT36 is designed to have an extremely even and well-behaved frequency response no matter
where the response is measured. This includes locations very close and far away from the system, from
points near the floor up to points above the system and locations at extreme horizontal off-axis points out
to ±90°. In addition, the system is specifically designed to operate over the floor without incurring the
harmful effects of floor bounce. An additional design advantage of the CBT36 is that it effectively
compensates for near-far volume level changes from locations very near the array to points 10 to 12 ft
away. These attributes are briefly illustrated in the following. All the following curves were measured over
the ground plane (floor). See “B&W 801 vs. CBT36 Ground-Plane Measurements” at:
http://www.audioartistry.com/products_CBT.htm
for a complete set of measurements and descriptions.
14.1.15.1. Traditional 1 m Response Curve (at 1 m from bottom of system, 1 m high):
This frequency response was measured
over a reflective ground-plane at 1 m out
from the bottom of the system and at 1 m
high. The bi-amp drive levels were set for
an average level of 85 dB SPL and
smoothed with a 1/12th -octave filter.
Although this response curve may not be
as pristine as the response curves
published by other manufacturers, it is
honest and represents the average
response you get at most other locations
in a real over-the-floor environment.
Again refer to the “B&W 80 vs. CBT36”
presentation mentioned above for more
detail.
14.1.15.2. Response vs. Height in Front of System (at heights of 0, 0.5, 1, 1.5, and 2 m High):
Note how little the response shape changes with different heights! Close to the system, the level varies
significantly and is loudest on the floor. Farther away, the response shape and level is quite uniform.
Directly in Front of the System at 0.1 m (4”):
At a Distance of 3 m (10 ft.) away:
14.1.15.3. Response vs. Distance (at distances of 0, 0.5, 1, 1.5, 2, 2.5, and 3 m (10 ft) Away):
Seated Height (1 m or 40” high):
Standing Height (1.7 m or 68” high):
