Lectrosonics PP25 User Manual
Voice Projector
Plus Power 25
®
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM
INTRODUCTION
The Plus Power 25 Extension Speaker is designed to
provide virtually unlimited additional sound coverage
when operated in conjunction with any of the Voice
Projector® family of portable sound systems and microphone mixers. In addition, it is intended to offer an easy
method of providing additional audience coverage when
used to amplify the high level remote speaker output
from tape cassette players, sound motion picture projectors, video tape players, etc. The Plus Power 25 is
completely portable and each unit contains its own
amplifier and power pack as well as the speaker and
enclosure. It weighs less than 6 pounds and is intended
for situations requiring moderate sound reinforcement,
primarily in indoor applications.
The Plus Power 25 may be connected to any Voice
Projector unit by means of an audio extension cable.
Each Plus Power unit has both an input and output
connector, permitting units to be connected in series.
While both the total number of Plus Power extension
speakers and the total length of audio extension cables
which may be driven by a Voice Projector unit are
virtually unlimited, some deterioration of the higher
frequency components may be noticed in installations
exceeding fifteen Plus Power speakers or driving cables
whose total length is in excess of 2500 feet.
AUDIO EXTENSION CABLES
Audio extension cables used with the Plus Power family
of extension speakers must be made from a high quality,
shielded, 2-conductor cable, such as Belden 8412. One
end of the cable must be terminated with a 3-pin female
audio connector (Switchcraft A3F or equivalent) and the
other with a 3-pin mal audio connector (Switchcraft A3M
or equivalent). The cable shield must be connected to
Pin 1 on each connector with the two signal wires
connected to Pins 2 and 3 respectively.
Audio extension cables specifically designed for use with
Plus Power extension speakers are available in standard
lengths of 25’, 50’, and 100’ (CP-25, CP-50 and CP-100
cables, respectfully) from your local dealer or from
Lectrosonics, Inc. In addition a special “Y” adapter cable
is available for use in applications where two or more
Plus Power speakers are to be located in opposite
directions from the driving unit.
OPERATING CONTROLS
The Plus Power 25 extension speaker has only a single
operating control, a four position Volume Range Selector
switch. This control is located on the same panel as the
Plus Power input (female) and output (male) connectors.
All other control functions are provided by the Voice
Projector unit driving the Plus Power 25.
The Volume Range Selector provides four separate
settings for adjusting the sound output level relative to
the volume of the driving unit. To select the appropriate
position, the user should first set the Volume Range
Selector to the minimum (counter clockwise) position
and check the sound level while operating the driving
unit with its volume control at mid-range. If additional
sound coverage is required, the Volume Range Selector
should be advanced (moved clockwise) step-by-step until
the desired sound coverage is achieved. The Volume
Range Selector should always be set at the minimum
level providing adequate sound coverage since higher
volume settings than necessary often tend to decrease,
rather than increase, intelligibility of the speaker. The
Volume Control on the driving unit provides the master
gain adjustment for both the driving unit and all Plus
Power extension speakers connected to that unit.
When the Plus Power 25 is driven by a Voice Projector
unit a relay located within the Plus Power 25 is remotely
activated by a special signal which is supplied by the
driving unit via the audio extension cable. In this mode
of operation the Plus Power 25 will be turned ON when,
and only when
, the driving unit is turned on. This feature
provides the user with a single master On/Off control for
a multiunit sound system composed of the driving unit
and one or more Plus Power extension speakers.
When the Plus Power 25 is used as an auxiliary amplifier
for the output from a tape cassette player, sound motion
picture projector, etc. the high level remote speaker input
must be connected to the Plus Power 25 via the HI
LEVEL IN jack located on the control panel of the unit.
In this mode of operation the Plus Power 25 will be
turned on whenever a phone plug is inserted into the HI
LEVEL IN jack.
2
Loading...