LD Systems DDQ SUB 18 - Manual (Page 9)

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CONNECTIONS, CONTROLS, AND INDICATORS: CONNECTIONS, CONTROLS, AND INDICATORS:
1 ANALOG INPUT LEFT / RIGHT
Balanced left and right XLR line inputs.
In order to use one subwoofer with two satellite speakers as a stereo sound system, connect the left and right
outputs of the sound source (e.g., mixer) with the left and right inputs of the subwoofer (ANALOG INPUT LEFT/
RIGHT). Now connect the left output of the subwoofer (INPUT LINK LEFT) to the active satellite speaker on the
left side and the right output of the subwoofer (INPUT LINK RIGHT) to the active satellite speaker on the right
side. The signal for the subwoofer is generated as a mono master signal from the stereo input signal.
In order to use two subwoofers with two satellite speakers as a stereo sound system, connect the left output
socket of the sound source to the input socket of the subwoofer on the left side (ANALOG INPUT LEFT or RIGHT).
If you have chosen the left input socket (ANALOG INPUT LEFT), now you must also use the left output socket
(INPUT LINK LEFT) to connect the satellite speaker on the left side and vice versa. Proceed analogously with
the right output socket of the sound source and the subwoofer with satellite speaker on the right side. Use only
balanced XLR cables to make the connections.
2 INPUT LINK - DDQ SAT LEFT/RIGHT
Balanced left and right XLR outputs. The signal present at the INPUT LINK output sockets is the same signal
present at the ANALOG INPUT input sockets. If LD Systems DDQ full-range speakers are used as satellite
speakers with the DDQ subwoofers, then the INPUT LINK output sockets must be used to drive them, since
the DDQ full-range speakers have a switchable high-pass filter.
3 AUX OUTPUT
Balanced XLR output with 100 Hz high-pass filter (mono master output from the left and right input signals).
For using active full-range speakers that do not have a switchable high-pass filter.
4 GAIN DB
Input sensitivity control with respect to the volume of the amplifier module. If the maximum input level (23 dBu)
is exceeded, this is indicated by collective flashing of LEDs 8-11. In this case, reduce the level of the signal
source to avoid negative effects on the sound.
5 DSP PRESET
The DSP presets 1 - 7 are DSP programs that set various low-pass filters (LPF) in the subwoofer
channel.
Preset 1: low-pass filter (LPF) 90 Hz. Use with loudspeakers in the LD Systems DDQ full-range series.
Preset 2: low-pass filter (LPF) 80 Hz.
Preset 3: low-pass filter (LPF) 85 Hz.
Preset 4: low-pass filter (LPF) 95 Hz.
Preset 5: low-pass filter (LPF) 100 Hz.
Preset 6: low-pass filter (LPF) 110 Hz.
Preset 7: low-pass filter (LPF) 120 Hz.