2.3.1 Controller settings
For acoustic adjustment the functions CUT, CPL and HFC can be
selected.
CUT mode
Set to CUT, the low frequency level of the cabinets is reduced. The
GSL8/GSL12 array is now configured for use with the actively
driven d&b SL-SUB or SL-GSUB cabinets.
CPL function
The CPL (
Coupling) function compensates for coupling effects
between the cabinets by reducing the low and low-mid frequency
level.
The SL-Series setups provide a two-stage filter (Low/Mid), which
allows the independent shaping of the low and low-mid responses.
The characteristcs of the CPL function are shown in the diagram
opposite. The standard setting (0) maintains the default array
response. CPL values can be set in the range from +5 to –5 (Low)
and from 0 to –8 (Mid) in increments of 0.5.
Note: Please note that all cabinets within the array should be
operated with the same CPL setting.
When processed conventionally (Line/Arc), the larger the
array the more attenuation by CPL will be required to achieve
a neutral response.
When operated with ArrayProcessing (AP), an array will
automatically be provided with the system target response, as
shown in the graphic opposite. All coupling effects caused by
the array length and shape are considered in the AP data. The
CPL function may still be used for additional corrections, for
example of room properties or coupling effects between main
hangs and outfills.
HFC function (Line/Arc setups only)
Selecting the HFC (High Frequency Compensation) function
compensates for the loss of high frequency energy due to air
absorption when loudspeakers are used to cover far field listening
positions.
The HFC function has two settings (HFC1 and HFC2) for different
distances the cabinets need to cover. The settings should be used
selectively; HFC1 compensates for 40 m (131 ft) and HFC2 for
80 m (262.5 ft) of additional distance from a reference position.
The compensation is adjusted for a typical relative humidity of
50 % at 22 °C. With lower humidity the absorption by air
increases, therefore the distances where the respective HFC setting
provides a correct equalization are shorter than indicated above.
Using the HFC function provides the correct sound balance
between close and remote audience areas, whilst all amplifiers
driving the array can be fed with the same signal.
Frequency response correction of the CPL function
for low and low-mid fequency level*
*schematic diagram
Frequency response correction of the HFC function*
*schematic diagram
d&b GSL8/GSL12 Manual 1.4 en
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