JBL LSR6312SP - Manual (Page 8)

8
Audio Connections
The LSR6325P includes one XLR and one RCA connector to accommodate a wide range of signal levels and
balanced or unbalanced configurations. The XLR input is nominal +4 dBu sensitivity and the RCA input is
-10 dBV. Variable user calibration is provided using the front panel volume control. Positive voltage applied
to pin 2 of the XLR or the pin of the RCA jack will produce a forward motion in the cone of the low frequency
transducer.
AC Power Connections
The LSR6325P has a power transformer which allow it to be used with multiple AC supply voltages around
the world. The LSR6325P will accept voltages from 100-120 or 200-240 Volts, 50-60 Hz when the voltage
setting and fuse is correct. The rating is visible in a small white window on the fuse holder. Before connect-
ing the system to the AC power, confirm that the switch setting on the rear of the unit is set to the proper
position and the fuse is the correct rating. (WHAT IS THE CORRECT FUSE VALUE FOR 110 AND 220? HOW DO
YOU REPLACE THE FUSE) The ground terminal of the IEC plug is required by wiring codes and regulations. It
must always be connected to the electrical installation and safety ground. The LSR6325P units have carefully
designed internal grounding and balanced inputs and outputs to reduce the possibility of ground loops which
cause hum. If hum occurs, see Appendix A for suggested audio signal wiring and system grounding.
Making Sound
After the audio and power connections are completed, the next step is to power-up. It is recommended
that you power all the equipment in the system prior to powering up the amplified LSR6325P monitors.
Alternately, if the speakers are ON, set the LSR6325P volume controls to their full counter clock-wise position
to produce minimum gain when powering up or powering down other components in the system. When the
Green LED on the front panel is illuminated, the speaker system is ready to go. Slowly advance gain of the
sound source and/or slowly increase the gain of the LSR6325P by turning the front panel volume control in
a clockwise direction and check for system noise. If everything is correct, advance the level of the sound
source, sit back and enjoy. If there is excessive hum, noise or no signal, see Appendix A for suggested wiring
practices.
Audio Level Adjustment
The audio level sensitivity of the LSR6325P can be adjusted to accommodate a wide range of applications.
Audio systems typically send signal with nominal level of either +4 dBu or -10 dBV. These are referred to as
professional and semi professional levels, respectively.
The nominal input level of the LSR6325P XLR input is +4 dBu and -10 dBV for the RCA input. A nominal level
to these inputs will produce an output of 96 dB SPL at a distance of 1 meter in an anechoic environment. This
allow the user to get a good match when using either professional or semi professional equipment. If less
sensitivity is needed the front panel volume control can be adjusted down. When set in the 12:00 position, the
front panel volume control attenuates the signal by 9 dB.
Frequency Response Adjustments
Four DIP switches located in a recess on the rear-panel of the LSR6325P allow the user to adjust frequency
response to compensate for placement, program material and personal preference. To activate the associated
switch function, set the switch in the UP position – so the switch is closer the JBL logo on the rear of the
speaker. The LSR6325P is shipped with all switches in the DOWN position so the switches are at the setting
farthest away from the JBL logo.
Rear Panel XLR and RCA Connectors