Specifications

TI 323 (6.0E)
14 - 36
Subwoofer array for maximum
horizontal directivity
Subwoofer array for maximum
vertical directivity
Loss over frequency at 100 metres (328.1 ft) with 10 %,
20 % and 50 % humidity
horizontal dispersion while still radiating a huge
amount of LF energy vertically. Vertical arrays
behave more practically; they maintain a broad
horizontal dispersion while narrowing the vertical
pattern. A vertical array puts more energy into
standard audience areas than a horizontal line of
subwoofers.
4.4.6. Rule of thumb
Doubling the number of subwoofers per side will give
an additional 6 dB in the low end. However, when
doubling mid/high systems (radiating into the same
direction) the average gain in their frequency range
will be around 3 dB.
For this reason there is usually a difference in ratio
between TOPs and SUBs; smaller systems 1 x TOP/2 x
SUB ratio up to a 1 to 1 ratio for bigger set ups.
All these theoretical aspects can be applied in the
following array design considerations: every sound
design that requires more than one cabinet, either for
SPL, or for coverage reasons, or a combination of
both, is a trade off between comb filter effects, the
resulting SPL over the audience area and as a further
result of the above, uniformity of frequency response.
The Democracy for Listeners.
4.5. Atmospheric effects
The propagation of a sound wave depends on the
properties of the atmosphere, these effects are
difficult to predict due to their chaotic behaviour.
4.5.1. Excessive HF loss
The effect of atmospheric loss is frequency
dependant. With increasing frequency the transfer of
energy decreases, this behaviour also depends on
temperature and relative humidity. As a rule of
thumb, the loss is greater with decreasing temperature
and relative humidity.
The following diagram shows the frequency
dependant attenuation at 100 metres (328.1 ft), 20° C
with 10 %, 20 % and 50 % relative humidity.
The C4-TOP and C3 controller provide a function
switch HFC (High Frequency Compensation) that
compensates for this transmission loss at 30 metres
(98.4 ft) and 50 % humidity.