Lectrosonics Long Ranger IV - Manual (Page 10)

Long Ranger 4
H187 Battery Replacement
The battery you use in the H187 Series transmitter
should be a 9 Volt lithium or alkaline, available almost
everywhere. A lithium 9 Volt battery will provide the
best performance with over 30 hours of operation. An
alkaline battery will provide up to 15 hours of operation,
and carbon zinc batteries, even if marked “heavy duty”
will only provide about 4 hours of operation. Recharge­
able batteries made to look like 9 Volt batteries typically
only produce 7.2 Volts at full charge, which will only
operate the transmitter for an hour or less. Make sure
your batteries are marked “alkaline.” Short battery life is
almost always caused by weak batteries or batteries of
the wrong type.
To open the battery compartment, press outward on the
cover door in the direction of the arrow as shown in the
drawing. Only slight, sliding pressure is needed to open
and close the battery door.
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 re­
quires 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 discon­
nect 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 net­
works 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 impor­
tant that you use only an 8 Ohm speaker in these jacks.
If you are not using Lectrosonics extension speakers,
check the speaker for the proper rating before connect­
ing to the Long Ranger.
The efficiency of different makes and models of speak­
ers varies significantly. Even though two different
Swing the door open and take note of the polarity
marked inside showing the location of the positive
(+) and negative (-) terminals. Insert the battery and
close the cover by pressing in and across, reversing
the opening procedure. Note that the battery door will
NOT close if the battery is inserted incorrectly, since the
terminals will hit a protective polarity barrier.
speakers are both rated at 8 ohms, their loudness
could be quite a bit different. The other specification to
compare when considering 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 specifi­
cation on the speaker you are considering. 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.
LECTROSONICS, INC. 10