D&B xC 16C, Manual

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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 different acoustic
properties of the venue. CPL begins gradually around 1 kHz, with
the maximum attenuation below 250 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.
-5
0
5
10
-10
-15
-20
-25
-30
20 100 1k 10k 20k
Frequency response correction of HFA circuit
Frequency response correction of CPL circuit
d&b 16C Manual 1.3 en 8