d&b audiotechnik Ci90 Manuel - Page 5

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Fig. 3: Frequency response correction with

HFA setting

Fig. 4: Frequency response correction of

CPL circuit

DELAY ON

REMOTE

LO IMP

3 4 5 6

SPKR

HFA

CUT

Fig. 5: E-PAC Configuration for Ci60/Ci90

(E-PAC version 2)

Ci45/Ci60/Ci90 Manual

Controller settings

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

selected.

CUT circuit

Set to CUT, the Ci60/Ci90/Ci45 low frequency level is reduced. The

loudspeaker is now configured for use with the Ci-SUB, Q-SUB or d&b

C-Series subwoofers.

HFA circuit

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

system 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 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).

Operation with E-PAC

To drive Ci60/Ci90 or Ci45 loudspeakers the E-PAC has to be

configured to Ci60/Ci90 (CI6/CI9) mode (possible with E-PAC version 2

from serial number Z2500.000.02-01313 and E-PAC version 3) or Ci45

mode (possible with E-PAC vesrion 3).

For an E-PAC version 2, the configuration is selected by setting the

appropriate DIP switches on the rear panel.

For an E-PAC version 3, the configuration is set via the encoder in

conjunction with the LCD.

Selecting Ci60/Ci90/Ci45 mode enables one Ci60/Ci90/Ci45 cabinet

to be driven at an output power of 300 Watts. LO IMP mode allows the

E-PAC to drive two cabinets with a 6 dB reduction of input level to the

speakers.

The CUT and HFA settings are available on versions 2 and 3 and are

explained under the previous section "Operation with D12 - Controller

settings".

(9.1E)

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