Db V8 User Manual download pdf (Page 7)

HFC circuit

Selecting the HFC (High Frequency Compensation) circuit

compensates for loss of high frequency energy due to absorption

in air when loudspeakers are used to cover far field listening

positions.

The HFC circuit has two settings (HFC1, HFC2) for different

distance ranges the cabinets have to cover. The settings should be

used selectively, only for those cabinets covering the respective

distances, HFC1 for distances larger than 30 m (100 ft) and HFC2

for 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.

CPL circuit

The CPL (Coupling) circuit compensates for coupling effects

between the cabinets of an array. CPL begins gradually around

2 kHz, with the maximum attenuation below 100 Hz. As coupling

effects increase with the length of the line array, the CPL circuit 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.

Fig. 3: Frequency response correction of HFC circuit

Fig. 4: Frequency response correction of CPL circuit

d&b V8/V12 Manual (1.6 EN) 7

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Db V8 User Manual Page 7