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Audio Connections
The LSR2300 Series Speakers are equipped with balanced XLR and 1/4" TRS connectors and unbalanced
RCA connectors for connection of professional computer audio interfaces, mixing consoles and audio production
equipment as well as unbalanced consumer audio products including personal music players, consumer audio
receivers and audio visual equipment.
Connect professional equipment with balanced outputs to the XLR or ¼" TRS input of the speaker using balanced
signal cables. (More information is available www.jblpro.com/lsr click on support.)
Connect consumer equipment with unbalanced outputs to the RCA input of the speaker.
The volume control on the rear of the speaker should be set to achieve the comfortable listening level when the
signal source is playing at it’s loudest volume. Positive voltage to Pin 2 of the XLR connector, the tip of the 1/4"
TRS jack, and the RCA jack will produce a forward motion in the low frequency cone.
Power Connections
The LSR2300 Models include a rear panel voltage selector switch that is set at the factory for the appropriate
voltage. Before connecting the power cable it is a good idea to check the position of this switch to conrm the
voltage switch is correctly set for the country of use. The power connector on the speaker includes a user-
replicable protective fuse. The ground terminal of the IEC plug is required by wiring codes and regulations and
must always be connected to the electrical installation safety ground. The LSR2300-Series units have carefully
designed internal grounding and balanced inputs and outputs to reduce the possibility of ground loops that
produce hum. If hum occurs, see Appendix A for suggested audio signal wiring, system grounding hints and
other preventive measures.
Making Sound
After connections are made, reduce the output level of the audio source (mixing console, computer recording
system, or preamp) to minimum. Turn on the powered speakers. When the Blue LED on the front of each speaker
illuminates, the speakers are ready to reproduce audio signals. Power up all audio equipment. Slowly advance the
volume control of connected audio equipment to achieve a suitable listening level, and enjoy.