d&b audiotechnik C690 Посібник - Сторінка 5
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IMPORTANT!
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Frequency response of HFA circuit
Frequency response of CPL circuit
C6/C690 Manual
Operation with D12
Selecting C6 mode in the D12 enables up to two C6/C690
cabinets to be driven by each channel. In applications with low
continuous levels and low ambient temperatures up to three
cabinets per channel may be connected.
When the D12 is operated in "Mix TOP/SUB" mode the C6/C690
cabinet and a respective active subwoofer can be linked together
locally and fed by a single 4-wire cable from either amplifier
output connector.
To apply SenseDrive for the subwoofer, EP5 connectors and 5-wire
cables have to be used. When operated in "Mix TOP/SUB" mode
the subwoofer has to be fed from the output B connector of the
D12 amplifier.
Controller settings
For acoustic adjustment the settings CUT, HFA and CPL can be
selected.
CUT
Set to CUT, a high pass filter with a 110 Hz cut off frequency is
inserted in the controller signal path. The C6/C690 is now
configured for use with d&b active subwoofers.
HFA circuit
In HFA mode (High Frequency Attenuation), the HF response of the
C6/C690 is rolled off. The 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.
10k
20k
CPL circuit
The CPL (Coupling) circuit compensates for coupling effects
between the cabinets when building closely coupled arrays. CPL
begins gradually at 1 kHz, with maximum attenuation below
250 Hz, providing a balanced frequency response when C6/C690
cabinets are used in arrays of two or more. The function of the CPL
circuit in the D12 amplifier is shown in the diagram opposite and
can be set in dB attenuation values between –9 and 0, or a positive
CPL value which creates an adjustable low frequency boost around
65 Hz (0 to +5 dB).
(3.0E)
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