d&b E6 - Manual (Page 6)

CPL circuit
Fig. 6: Frequency response correction of
CPL circuit
The CPL (Coupling) circuit compensates for coupling effects when
building closely coupled arrays or when the cabinet is used as a stage
monitor. CPL begins gradually at 1 kHz, with maximum attenuation
below 250 Hz, providing a balanced frequency response when E6
cabinets are used in arrays of two or more. The function of the CPL
circuit 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
Selecting E6 mode enables the E-PAC to drive up to three E6
loudspeakers. LO IMP mode configures the E-PAC to drive a maximum
of five E6 loudspeakers with a 6 dB reduction in input level to the
loudspeakers.
For acoustic adjustment the functions CUT and HFA can be selected. The
characteristics of the CUT and HFA settings are explained in the
previous section "Operation with D6 or D12 - Controller settings".
E6 Manual, (1.1 EN) Page 6 of 10