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Frequency response correction of the HFC function*

*schematic diagram

Frequency response correction of the Coupling function

for low and low-mid fequency level*

*schematic diagram

2.3.1 Controller settings

For acoustic adjustment the functions CUT, HFC and Coupling can

be selected.

CUT mode

Set to CUT, the low frequency level of the cabinets is reduced. The

XSL8/XSL12 array is now configured for use with applicable d&b

subwoofer.

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.

Coupling function

The 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 Coupling function are shown in the

diagram opposite. The standard setting (0) maintains the default

array response. Coupling 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 Coupling setting.

When processed conventionally (Line/Arc), the larger the array

the more attenuation by Coupling 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

Coupling function may still be used for additional corrections,

for example of room properties or coupling effects between

main hangs and outfills.

d&b XSL8/XSL12 Manual 1.2 en