Ac Power Connections; Making Sound Happen - JBL LSR25P Owner's Manual

Section 2: Getting Started

2.4 AC Power Connections:

The LSR25P has power transformers which allow them to be used with multiple
AC supply voltages around the world. Before connecting the unit to AC power, confirm that
the switch setting on the rear of the unit is set to the proper position and the fuse is the cor-
rect rating. The LSR25P will accept voltages from 100-120 or 200-240 Volts, 50-60 Hz when
the voltage setting and fuse is correct. The ground terminal of the IEC plug is required by
wiring codes and regulations. It must always be connected to the electrical installation
safety ground. The LSR units have carefully designed internal grounding and balanced
inputs and outputs to reduce the possibility of ground loops (hum). If hum occurs, see
Appendix A for suggested audio signal wiring and system grounding.

2.5 Making Sound Happen:

After connections are made, the next step is to power up all equipment before the
amplified LSR25P monitors. Reduce the level of the monitor outputs of your console or
preamp and also turn the volume on the front of the LSR25P monitors fully counter clock-
wise for minimum gain. You can now turn on the monitors. There is a small delay with
the turn on to accommodate for clicks and thumps from upstream equipment. When the
Green LED on the front panel turns on, the units are ready to go. Slowly advance the gain
of the LSR25P monitors and check for hum or noise. If everything is correct, advance the
the console to feed the monitoring system and sit back and enjoy. If there is excessive
hum, noise or no signal see Appendix A on suggested wiring practices.
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