d&b audiotechnik 44S Manual - Página 7

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-5

-10

-15

-20

-25

-30

100

Frequency response correction in HFA mode*

*schematic diagram

Frequency response correction of the CPL function*

*schematic diagram

d&b 44S Manual 1.1 en

10k

20k

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 and the system performance can not be achieved.

Applicable d&b amplifiers:

D6|D20|D80|10D|30D|40D

Amplifier output mode(s): Dual Channel or Mix TOP/SUB

Application

Setup

44S

2.3.1 Controller settings

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

selected.

CUT mode

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

is now configured for use with applicable, actively driven d&b

subwoofers.

HFA mode

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 function

The CPL (Coupling) function compensates for the different acoustic

properties depending on whether the loudspeaker is freely

positioned or flush-mounted.

At attenuation values of up to –5, CPL begins gradually around

1 kHz and reaches the maximum attenuation below 200 Hz. At

higher values of up to –9, the filter corner frequency gradually

shifts to higher frequencies while an attenuation of 5 dB is

maintained.

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

+5 dB) at around 90 Hz and can be set when the system is used in

full range mode without subwoofers.

Cabinets per

amplifier

channel