d&b audiotechnik Vi8 Manuale - Pagina 8

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Frequency response correction of the CPL function

Frequency response correction of the HFC function

CPL function

The CPL (Coupling) function compensates for coupling effects

between the cabinets of an array. CPL begins gradually around

2 kHz, with the maximum attenuation below Hz. As coupling

effects increase with the length of the line array, the CPL function

can be set to dB attenuation values between 0 and –9. With

higher attenuation values the corner frequency of the filter shifts

towards lower values.

Positive CPL values create an adjustable low frequency boost (0 to

+5 dB) and can be set when the system is used in full range mode

without subwoofers.

Note: Make sure that all cabinets within the line array are

operated with the same CPL setting.

HFC function

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 for cabinets covering distances larger than 30 m

(100 ft) and HFC2 for those covering distances larger than 60 m

(200 ft).

The compensation is adjusted for a typical relative humidity of

40 %. 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.

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