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Fig. 6: Frequency response correction of HFA circuit

Fig. 7: Frequency response correction of the CPL circuit

d&b 4S/5S Manual 1.3 en

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2.3. Operation

NOTICE!

Only operate d&b loudspeakers with a correctly configured d&b

amplifier, otherwise there is a risk of damaging the loudspeaker

components.

Applicable d&b amplifiers:

10D/30D/D6/D12/D20/D80.

Application

Setup

Within applicable d&b amplifiers, the controller setups are

available in Dual Channel or Mix TOP/SUB mode.

2.3.1. Controller settings

For acoustic adjustment the functions CUT, HFA and CPL can be

selected.

CUT circuit

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

cabinets are now configured for use with d&b active subwoofers.

HFA circuit

In HFA mode (High Frequency Attenuation), the HF response of the

system is rolled off. HFA provides a natural, balanced frequency

response when a unit is placed close to listeners in near field or

delay use.

High Frequency Attenuation begins gradually at 1 kHz, dropping

by approximately 3 dB at 10 kHz. This roll off mimics the decline

in frequency response experienced when listening to a system from

a distance in a typically reverberant room or auditorium.

CPL circuit

The CPL (Coupling) circuit compensates for coupling effects

between the cabinets when building closely coupled arrays. CPL

begins gradually around 1 kHz, with the maximum attenuation

below 200 Hz. To achieve a balanced frequency response, the

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

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.

Cabinets per

channel