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Quasi
Anechoic Pole Measurements |
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The
TS360 turntable stand mounts directly on the LT360 Precision Turntable.
It provides a quick and convenient means for obtaining polar acoustic
field data on loudspeakers, horns, enclosures and other similar devices.
The TS360 was specifically designed to enable offset rotation, thereby
permitting rotation relative to the center of the baffle board, rather
than the center of the enclosure. This is a common requirement as
measurements are often related to the front surface of the enclosure
or device.
Gated or time windowed measurements can be used to produce data typically
down to 200Hz. Polar measurements on small and medium size devices
generally do not have much significance below these low frequencies,
since the polar response becomes omnidirectional.
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| Minimum
Acoustic Signature |
Nearly
all mounting methods used for acoustic measurements present a concern
for their influence on the acoustic field and their contribution of
error to the measurements. This is especially true for polar measurements
where the response is to be measured 360 degrees around the device.
The TS360 was carefully designed and modeled to reduce the acoustic
signature and minimize correlated reflections. All brackets feature
a triangular aperiodic shape with a staggered perforated surface and
45 degree facets. |
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| Torque
Balancing |
When
a mass is rotated at a distance from the center, a torque load results
which can be substantial for large or heavy enclosures. The TS360
features a counter offset mounting point where counter balance weights
can be attached to offset and cancel the torque of the load.
The distance of the counter balance point can be modified greatly
by mounting a suitable beam or bar extension. Sliding weights can
be facilitated in this manner or other similar attachments.
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