Lectronics LongRanger4 Operating Instructions Manual - Using Additional Speakers
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Long Ranger 4
LECTROSONICS, INC.
USING ADDITIONAL SPEAKERS
CAUTION!
ALWAYS TURN THE LONG RANGER POWER OFF
BEFORE PLUGGING IN OR UNPLUGGING EXTERNAL SPEAKERS
In some cases, the proper coverage of an audience requires a second speaker. The optional H300 is identical to the
Long Ranger speaker and can be used to spread the sound over a broader area.
The output jacks for external speakers are located on the Long Ranger front panel. The left and right jacks operate
differently. The right jack does not disconnect the built-in speaker when a plug is inserted into it. This means that the
built-in speaker and the external speaker will both operate together. The left output jack disconnects the built-in
speaker and powers only the external speaker. Internal circuits and switching networks keep track of the number of
speakers hooked up and select the amplifier impedance so that the full power of the amplifier is always available. It
is important that you use only an 8 Ohm speaker in these jacks. If you are not using Lectrosonics extension speak-
ers, check the speaker for the proper rating before connecting to the Long Ranger.
The efficiency of different makes and models of speakers varies significantly. Even though two different speakers are
both rated at 8 ohms, their loudness could be quite a bit different. The other specification to compare when consid-
ering the use of another speaker is the efficiency rating. The horn built into the Long Ranger is rated at 107 dB SPL
(sound pressure level) at one meter with a one watt input. Check this specification on the speaker you are consider-
ing. A speaker with a lower “dB’ number will not be as loud as the horn built into the Long Ranger.
The H300 speaker is typically used in conjunction with the built-in speaker to increase the sound coverage area.
This is done by plugging the H300 into the right speaker jack, so that both speakers will work together. In a large
area, such as a football field, try to arrange the speakers so that the listeners are not in the direct sound field of both
speakers. If a listener can hear two speakers located at different distances, a distracting “echo effect” occurs. Put
the speakers close to one another in a central location and aim them in opposite directions to broaden the coverage
pattern.
When using two external speakers simultaneously, the built-in speaker will be automatically disconnected to prevent
overload of the amplifier since a plug has been inserted into the left-hand jack.