Controller settings
For acoustic adjustment the functions CUT, HFC and CPL can be
selected.
CUT circuit
Set to CUT, the Qi1 low frequency level is reduced. The Qi1 is now
configured for use with d&b active subwoofers.
HFC circuit
Fig. 3: Frequency response correction of
HFC circuit
Selecting the HFC (High Frequency Compensation) circuit compensates
for loss of high frequency energy due to absorption in air when
loudspeakers are used to cover far field listening positions.
The HFC circuit should be used selectively, only for those cabinets
covering distances larger than 50 m (160 ft). This guarantees the
correct sound balance between close and remote audience areas, whilst
all amplifiers driving the array can be fed with the same signal.
CPL circuit
Fig. 4: Frequency response correction of
CPL circuit
The CPL (Coupling) circuit compensates for coupling effects between the
cabinets; these effects increase as the length of the line array is
extended. CPL begins gradually at 1 kHz, with the maximum attenuation
below 400 Hz, providing a balanced frequency response when Qi1
cabinets are used in arrays of four 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 Q1 mode enables the E-PAC to drive one Qi1 loudspeaker.
LO IMP mode allows the E-PAC to drive two Qi1 loudspeakers with a
6 dB reduction of input level to the speakers.
The CUT and CPL settings are available. The characteristics of the CUT
and CPL settings are explained in the previous section "Operation with
D6 or D12 - Controller settings".
The E-PAC CPL circuit creates a 3 dB attenuation corresponding to the
– 3 dB curve shown in Fig. 4.
Qi1 Manual
(1.3 EN)
Page 6 of 8
Содержание Qi1
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