LD Systems DDQ Serie Bedienungsanleitung Seite 7

DISPERSIoN BEhaVIoUR oF a coNVENTIoNal
SUBwooFER SETUP (simplified depiction)
Rear
180°
120°
60°
0°
Front
-60°
-120°
-180°
Rear
0,02 0,05
Frequency [kHz]
DISPERSIoN BEhaVIoUR oF a caRDIoID
SUBwooFER aRRaY (simplified depiction)
Rear
180°
120°
60°
0°
Front
-60°
-120°
-180°
Rear
0,02 0,05
Frequency [kHz]
DDQSUB caRdioid tEchnology:
0,1 0,2 0,5
0,1 0,2 0,5
USE oF ThE DDQ SUBwooFERS aS a caRDIoID
SUBwooFER aRRaY
The DSP presets A1 - D2 are sophisticated DSP programs
that make it possible to attain a cardioid dispersion
pattern by combining two or three DDQ subwoofers.
This results in the following advantages in comparison
with conventional subwoofer setups:
-a rear attenuation of up to 20 dB
-enhanced bass presence in the audience area
-avoidance of unwanted reflections from rear walls
-reduction of diffuse sound in rooms
-elimination of bass frequency interference onstage
-differentiated sound for onstage monitoring
-reduction of the risk of feedback when using stage
microphones
Use only DDQ subwoofers of the same type for
cardioid setups.
The same audio signal must be present at all subwoofers
used for a cardioid setup.
The GAIN control settings must be identical on all
subwoofers used for a cardioid setup.
The DSP preset must be set individually for each
subwoofer.
Whether the subwoofer is operated vertically or
horizontally is unimportant for the functioning of the
cardioid presets.
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