d&b audiotechnik Q1 Manual del usuario - Página 6

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Fig. 4: Frequency response correction of

HFC circuit

Fig. 5: Frequency response correction of

CPL circuit

Q1Manual

Controller settings

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

selected.

CUT circuit

Set to CUT, the Q1 low frequency level is reduced. The Q1 is now

configured for use with the Q-SUB or d&b C-Series subwoofers.

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

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 Q1 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 Q1 loudspeaker.

LO IMP mode allows the E-PAC to drive two Q1 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 with

the – 3 dB curve shown in Fig. 5.

(2.2 EN)

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