LD Systems DDQ SUB 18 - Manual (Page 11)

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CONNECTIONS, CONTROLS, AND INDICATORS: CONNECTIONS, CONTROLS, AND INDICATORS:
6 DSP/GAIN ENABLE/DISABLE
Pressing this switch prevents inadvertent adjustment of preset and gain settings by disabling the GAIN dB
and DSP PRESET controls (DSP/GAIN DISABLE). If the switch is activated, the associated DSP/GAIN DISABLE
LED lights up. If the function is deactivated (DSP/GAIN DISABLE LED is off), then the current values set on the
GAIN and PRESET controls are loaded into the DSP and both controls are enabled again.
7 GROUND LIFT
When depressed, this switch can eliminate ground loop hum if devices with varying ground potentials are
connected.
8 DSP/GAIN DISABLE LED
Lights up if the DSP/GAIN ENABLE/DISABLE switch is depressed (DSP/GAIN DISABLE). In this state, the GAIN
dB and DSP PRESET controls are disabled.
9 PEAK LIMIT LED
Lights up if the subwoofer is operating in the clipping range. Brief flashing is not a cause for concern, since
the internal audio limiter compensates for over-modulation. Permanent illumination should be avoided by
reducing the input level.
10 SIGNAL LED
Lights up when an audio signal is present at the line input (> -30dBu).
11 OPERATE LED
Lights up when the subwoofer is switched on and properly connected to the power mains.