Lectrosonics PP25 User Manual download pdf (Page 2)

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 micro-

phone 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 projec-

tors, 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.

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Lectrosonics PP25 User Manual Page 2

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