Lectrosonics Long Ranger IV - Manual (Page 5)

Portable Wireless Sound System
Front Panel
12V DC Ext Power
A special jack used to connect an external 12 Volt DC
source to the unit to substitute for the “on-board” bat­
tery pack. It is most commonly used for connecting the
Long Ranger to a vehicle cigarette lighter or 12V DC
auxiliary receptacle. When an external power source
is connected to this jack, the on-board battery pack is
automatically disconnected.
CAUTION: Make sure you comply with the polarity
markings on the jack. The correct plug for making
the connection is a Radio Shack 274-1567 size K
coaxial DC power plug. Radio Shack also stocks
cigarette lighter plugs (with built-in fuse) and cords
to construct a suitable assembly
External 8 Ohm Speakers
Two jacks which are used to connect external 8 ohm
loudspeakers such as the Lectrosonics H300 re-entrant
horn. This jack can also be used to power other brands
of loudspeakers, but be sure that the speaker has a
rated impedance of 8 ohms. The left-hand jack discon­
nects the built-in horn when the plug is inserted. The
right-hand jack will operate the internal horn along with
the external speaker. 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 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 specification on the speaker you are consid­
ering. A speaker with a lower “dB’ number will not be as
loud as the horn built into the Long Ranger.
12V DC
EXT POWER
Figure 2 - Long Ranger 4 Front Panel
Rio Rancho, NM 5