Bosch Appliances PLE-2MA240-US, PLE-2MA120-US User Manual

Plena Mixer Amplifier

Installation and User Instructions

PLE-2MA120-US

en

PLE-2MA240-US

Plena Mixer Amplifier | Installation and User Instructions | Important safeguards en | 2

Important safeguards

Alerts on the apparatus

This symbol found on the apparatus indicates
hazards arising from dangerous voltages.

This symbol found on the apparatus indicates
the user should read all safety statements found
in the operating instructions.

This symbol found on the apparatus indicates
double insulation.

Warning

To reduce the risk of fire or electrical shock, do
not expose this apparatus to rain or moisture.

This symbol found on the apparatus indicates
that the apparatus must be placed in a separate
collection facility for electronic waste and not
disposed with household waste.

1 Read instructions - All the safety instructions for use

should be read before the system is operated.

2 Retain instructions - The safety instructions and

operating instructions should be retained for future
reference.

3 Heed warnings - All warnings on the unit and in the

operating instructions should be adhered to.

4 Follow instructions - All operating instructions and

instructions for use should be followed.

5 Cleaning - Unplug system units from the mains

outlet before cleaning. Do not use liquid cleaners or
aerosol cleaners. Use only a dry cloth for cleaning.

6 Attachments - Do not use attachments not

recommended by the product manufacturer as they
may cause hazards.

7 Water and Moisture - Do not use this unit near water,

for example near a bathtub, washbowl, kitchen sink,
or laundry basket, in a wet basement, near a
swimming pool, in an unprotected outdoor
installation or any area which is classified as a wet
location.

8 Accessories - Do not place this unit on an unstable

stand, tripod, bracket or mount. This unit may fall,
causing serious injury to a person and serious
damage to the unit. Use only a stand, tripod, bracket
or mount recommended by the manufacturer, or
sold with the product. Any mounting of the unit
should follow the manufacturer's instructions, and
should use a mounting accessory recommended by
the manufacturer. An appliance and cart
combination should be moved with care. Quick
stops, excessive force, and uneven surfaces may
cause the appliance and cart combination to
overturn.

9 Ventilation - Openings in the enclosure, if any, are

provided for ventilation and to ensure reliable
operation of the unit and to protect it from
overheating. These openings must not be blocked or
covered. The unit should not be placed in a built-in
installation unless proper ventilation is provided or
the manufacturer's instructions have been adhered
to. Maintain a minimum distance of 2 inch (50 mm)
around the front, the rear, and the sides of the unit
for sufficient ventilation.

10 Heat sources - Do not install the unit near any heat

sources such as radiators, stoves, or other apparatus
that produce heat (including amplifiers).

11 Open flames - No open flames, such as lighted

candles, should be placed on the unit.

12 Power sources - Units should be operated only from

the type of power source indicated on the marking
label. If you are not sure of the type of power supply
you plan to use, consult your appliance dealer or
local power company. For units intended to operate
from battery power, or other sources, refer to the
"Installation and User Instructions".

13 Grounding or polarisation - This unit may be

equipped with a polarised alternating current line
plug (a plug having one blade wider than the other).
This plug will fit into the power outlet only one way.
This is a safety feature. If you are unable to insert the
plug fully into the outlet, try reversing the plug. If the
plug still fails to fit, contact your electrician to
replace your obsolete outlet. Do not defeat the safety
purpose of the polarised plug. Alternatively, this unit
may be equipped with a 3-wire grounding type plug
having a third (grounding) pin. This plug will only fit
into a grounding-type power outlet. This is a safety
feature. If you are unable to insert the plug into the

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Plena Mixer Amplifier | Installation and User Instructions | Important safeguards en | 3

outlet, contact your electrician to replace your
obsolete outlet. Do not defeat the safety purpose of
the grounding-type lug.

14 Power-Cord Protection - Power supply cords should

be routed so that they are not likely to be walked on
or pinched by items placed upon or against them,
paying particular attention to cords and plugs,
convenience receptacles, and the point where they
exit from the appliance.

15 Overloading - Do not overload outlets and extension

cords as this can result in a risk of fire or electrical
shock.

16 Object and Liquid Entry - Never push objects of any

kind into this unit through openings as they may
touch dangerous voltage points or short-out parts
that could result in a fire or electric shock. Never
spill liquid of any kind on the unit.

17 Servicing - Do not attempt to service this unit

yourself as opening or removing covers may expose
to dangerous voltage or other hazards. Refer all
servicing to qualified service personnel.

18 Damage Requiring Service - Unplug the unit from

the outlet and refer servicing to qualified service
personnel under the following conditions:

• When the power-supply cord or plug is damaged.

• If liquid has been spilled, or objects have fallen
into the unit.

• If the unit has been exposed to rain or water.

• If the unit does not operate normally by following
the instructions for use. Adjust only those
controls that are covered by the instructions for
use, as an improper adjustment of other controls
may result in damage and will often require
extensive work by a qualified technician to
restore the units to their normal operation.

• If the unit has been dropped or the unit has been
damaged.

• When the unit exhibits a distinct change in
performance; this indicates a need for service.

19 Replacement Parts - When replacement parts are

required be sure the service technician has used
replacement parts specified by the manufacturer or
parts which have the same characteristics as the
original part. Unauthorised substitutions may result
in fire, electric shock or other hazards.

20 Safety Check - Upon completion of any service or

repairs to the units, ask the service technician to

perform safety checks to determine that the unit is in
proper operating condition.

21 Lightning - For added protection of the units during

a lightning storm, or when it is left unattended and
unused for long periods of time, unplug it from the
wall outlet and disconnect the cable system. This will
prevent damage to the unit due to lightning and
power-line surges.

22 Disconnection - To completely disconnect this unit

from the AC mains, disconnect the power supply
cord plug from the AC receptacle. The mains plug of
the power supply cord shall remain readily operable
to be able to disconnect power from the unit.

23 Before installing or operating this product, always

read the Safety Instructions, which are available as a
separate document (9922 141 7014x). These
instructions are supplied together with all equipment
that can be connected to the mains.

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Plena Mixer Amplifier | Installation and User Instructions | Important safeguards en | 4

American Users

Note

This equipment has been tested and found to
comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC rules.
These limits are designed to provide reasonable
protection against harmful interference in a
residential installation.
This equipment generates, uses, and can
radiate radio frequency energy and, if not
installed and used in accordance with the
instructions, may cause harmful interference to
radio communications. However, there is no
guarantee that interference will not occur in a
particular installation. If this equipment does
cause harmful interference to radio or television
reception, which can be determined by turning
the equipment OFF and ON, the user is
encouraged to try to correct the interference by
one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the
equipment and the receiver.

• Connect the equipment into an outlet on a
circuit different from that to which the
receiver is connected.

• Consult the dealer or an experienced
radio/TV technician for help.

Canadian Users

Note

This Class B digital device complies with
Canadian ICES-003.
Cet appareil numérique de classe B est
conforme à la norme NMB-003 du Canada.

Thank you for choosing a Bosch Security Systems
product!

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Plena Mixer Amplifier | Installation and User Instructions | Table of contents en | 3

Table of contents

Important safeguards ...................................................................................................................................................2

Table of contents ...........................................................................................................................................................3

1. Introduction ....................................................................................................................................................................5

1.1 Purpose .....................................................................................................................................................................................5

1.2 Digital document .....................................................................................................................................................................5

1.3 Intended audience ..................................................................................................................................................................5

1.4 Related documentation ..........................................................................................................................................................5

1.5 Alerts ..........................................................................................................................................................................................5

1.6 Icons ...........................................................................................................................................................................................5

1.6.1 Note icons ...........................................................................................................................................................................5

1.6.2 Caution, Warning, and Danger icons ...........................................................................................................................5

1.7 Conversion tables ...................................................................................................................................................................6

2. Description .....................................................................................................................................................................7

2.1 The Plena product range .......................................................................................................................................................7

2.2 Contents of box .......................................................................................................................................................................7

2.3 The Plena Mixer Amplifier ......................................................................................................................................................7

2.4 Controls, connectors and indicators ..................................................................................................................................9

2.4.1 Front panel ..........................................................................................................................................................................9

2.4.2 Plena PLE-WP2Z3S wall panel .....................................................................................................................................9

2.4.3 Rear panel ........................................................................................................................................................................ 10

3. Installation ................................................................................................................................................................... 13

3.1 Unpack unit ............................................................................................................................................................................13

3.2 Install unit in rack (optional) ............................................................................................................................................... 13

3.3 Check settings/connections .............................................................................................................................................. 13

3.4 Connect unit to mains ......................................................................................................................................................... 13

4. Connections and settings ........................................................................................................................................ 15

4.1 Connecting inputs ................................................................................................................................................................15

4.1.1 DC supply (battery) ........................................................................................................................................................15

4.1.2 Priority microphone (input 1) .......................................................................................................................................16

4.1.3 Secondary microphone (input 2) ................................................................................................................................17

4.1.4 Additional microphones (inputs 3 through 6) ..........................................................................................................17

4.1.5 Emergency inputs ...........................................................................................................................................................18

4.1.6 Music source inputs ....................................................................................................................................................... 20

4.2 Connecting outputs .............................................................................................................................................................21

4.2.1 Zone 1 and 2 ...................................................................................................................................................................21

4.2.2 Call only ............................................................................................................................................................................ 21

4.2.3 Music only ........................................................................................................................................................................21

4.2.4 Line out/ loop through ...................................................................................................................................................21

4.2.5 Connecting speakers ..................................................................................................................................................... 22

4.3 Unit settings ..........................................................................................................................................................................23

4.3.1 Rear panel settings ........................................................................................................................................................ 23

4.3.2 Pin settings and labelling ..............................................................................................................................................25

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5. Operation ..................................................................................................................................................................... 27

5.1 Switch on and off ................................................................................................................................................................. 27

5.1.1 Switch on .........................................................................................................................................................................27

5.1.2 Switch off .........................................................................................................................................................................27

5.2 Microphone/line controls ....................................................................................................................................................28

5.3 Music controls .......................................................................................................................................................................28

5.3.1 Source selection ............................................................................................................................................................. 28

5.3.2 Volume control ................................................................................................................................................................ 28

5.4 Tone control ..........................................................................................................................................................................28

5.4.1 Introduction ...................................................................................................................................................................... 28

5.4.2 Microphone/line tone control ....................................................................................................................................... 28

5.4.3 Music tone control .......................................................................................................................................................... 28

5.5 Output controls .....................................................................................................................................................................29

5.5.1 Zone selection ................................................................................................................................................................. 29

5.5.2 Master volume control ...................................................................................................................................................29

6. Technical data ............................................................................................................................................................. 31

6.1 Electrical ................................................................................................................................................................................. 31

6.1.1 Mains power supply .......................................................................................................................................................31

6.1.2 Battery power supply .....................................................................................................................................................31

6.1.3 Power consumption .......................................................................................................................................................31

6.1.4 Performance ....................................................................................................................................................................31

6.1.5 RJ-45 input 2 x ................................................................................................................................................................31

6.1.6 Mic/line input 6 x ............................................................................................................................................................. 31

6.1.7 Music inputs 3x ............................................................................................................................................................... 32

6.1.8 Emergency / telephone 1 x ..........................................................................................................................................32

6.1.9 Loop through insert 1 x .................................................................................................................................................32

6.1.10 Master/music output 1 x ...............................................................................................................................................32

6.1.11 Loudspeaker outputs 70 V, 25 V* ..............................................................................................................................32

6.1.12 Loudspeaker output 4 Ohm* ....................................................................................................................................... 32

6.2 Mechanical ............................................................................................................................................................................. 32

6.3 Environmental ........................................................................................................................................................................ 32

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Plena Mixer Amplifier | Installation and User Instructions | Introduction en | 5

1 Introduction

1.1 Purpose

The purpose of these Installation and User Instructions
is to provide information required for installing,
configuring and operating a Plena Mixer Amplifier.

1.2 Digital document

These Installation and User Instructions are also
available as a digital document in the Adobe Portable
Document Format (PDF).

1.3 Intended audience

These Installation and User Instructions are intended
for installers and users of a Plena system.

1.4 Related documentation

Safety Instructions (9922 141 1036x).

1.5 Alerts

Four types of alerts are used in this manual. The alert
type is closely related to the effect that may be caused if
it is not observed. These alerts - from least severe effect
to most severe effect - are:

• Note
Alert containing additional information. Usually, not
observing a note alert does not result in damage to
the equipment or personal injuries.

• Caution
The equipment can be damaged if the alert is not
observed.

• War ning
Persons can be (severely) injured, or the equipment
can be seriously damaged, if the alert is not
observed.

• Danger
Not observing the alert can result in death.

1.6 Icons

1.6.1 Note icons

The icons used in combination with Notes provide extra
information about the Note. See the following
examples:

Note

General icon for notes.

Note

Consult the indicated source of information.

1.6.2 Caution, Warning, and Danger
icons

The icons used in combination with Caution, Warnings,
and Dangers indicate the type of hazard present. See the
following examples:

Caution, Warning, Danger

General icon for Cautions, Warnings and
Dangers.

Caution, Warning, Danger

Icon for risk of electric shock.

Caution, Warning, Danger

Icon for risk of electrostatic discharge.

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1.7 Conversion tables

In this manual, SI units are used to express lengths,
masses, temperatures etc. These can be converted to
non-metric units using the following information.

table 1.1: Conversion of units of length

1 in = 25.4 mm 1 mm = 0.03937 in
1 in = 2.54 cm 1 cm = 0.3937 in
1 ft = 0.3048 m 1 m = 3.281 ft
1 mi = 1.609 km 1 km = 0.622 mi

table 1.2: Conversion of units of mass

1 lb = 0.4536 kg 1 kg = 2,2046 lb

table 1.3: Conversion of units of pressure

1 psi = 68.95 hPa 1 hPa = 0.0145 psi

Note

1 hPa = 1 mbar.

table 1.4: Conversion of units of temperature
° F = 9 . ( ° C + 32) ° C = 5 . ( ° F 32)

° F = 5 ° C = 9

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Plena Mixer Amplifier | Installation and User Instructions | Description en | 7

2 Description

2.1 The Plena product range

The Plena Mixer Amplifier is part of the Plena product
range. Plena provides public address solutions for places
where people gather to work, worship, trade, or relax. It
is a family of system elements that are combined to
create public address systems tailored for virtually any
application.

The Plena product range includes:

•mixers

• power amplifiers

• a music source unit

• a digital message manager

• a feedback suppressor

• call stations

• an All-in-One system

•a timer

The various elements are designed to complement each
other thanks to matched acoustical, electrical and
mechanical specifications.

2.2 Contents of box

The packaging box contains the following contents:

• PLE-2MA120-US, or PLE-2MA240-US

• Labels and colored pins for indicating favorite
settings

•Power cord

• Plena Bonus CD

• Mounting brackets (LBC 1901/00)

2.3 The Plena Mixer Amplifier

The Plena Mixer Amplifier is a high performance,
professional public address unit for mixing up to six
separate microphone/line signals, and any one of three
separate music signals. For a schematic overview of the
Plena Mixer Amplifier, see figure 2.1 on the next page.

The volume of each microphone/line signal can be
individually adjusted to obtain the required mix; the
mixed output is controlled via the master volume
control and separate high/low tone controls.
The unit is easy to use, and provides a crisp call or clear
music. The amplifier also has enhanced features such as
ducking level control, priority, labelling, and setting
indicators.

All Microphone/line inputs can be switched between
microphone level and line level sensitivity. The inputs
are balanced but can also be used unbalanced. Phantom
power can be selected via a DIP switch to provide
power to condenser microphones. Input channels 1
and 2 can take priority over all other microphone and
music inputs:

• Input 1 can be activated by contact closure on a PTT
(push to talk). A chime can be configured to precede
an announcement.

• Input 2 can be switched automatically if a signal is
available at the input, for example. if someone
speaks into the microphone (VOX activation).

A telephone/70 V emergency input with VOX
activation is also provided for easy integration with
another PA system or a telephone paging system. It has
its own volume control and overrides all other inputs,
including the call station and inputs 1 and 2.

The unit also has a line output to add amplifiers for
larger systems that require more output power. This
output can be switched to music only, for example, so
that music on hold can be provided for the telephone
system. Loop through input and output connections
enable external sound processing equipment (for
example, an equalizer or Plena feedback suppressor) to
be connected between the preamplifier and the power
amplifier stages. A feedback suppressor can ensure
feedback-free, clear speech for all microphones.

Users can create custom labels for inputs, music sources,
and output zones. These labels can be attached to the
special holders at the front of the mixer amplifier.
Colored pins can also be inserted at various positions
around the volume and tone dial controls to indicate
favorite settings for a particular application.

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An LED meter monitors the master output before the
zone selection. This signal is also present on the
headphone connector below the output meter. For
total reliability and ease of use, a limiter is integrated
into the output stage to restrict output if the user
applies too much signal.

Note

When using the unit with backup power of 24 V,
make sure that the unit is always powered ON.
When the unit is switched OFF, the batteries will
be drained as this will be regarded as a power

The unit has 24 VDC backup input with built in
24 VDC battery charger. A separate battery charger is,

source. Consequently the unit will revert to
24 VDC power from the 24 V input

therefore, not required. The charger charges the battery
with a 0.5 A constant current until the battery voltage
reaches 27.4 VDC. The charger then switches over to
constant voltage charging (also known as float charging).

CALL STATION

PTT

Call Station Control

0

0

70 V

8Ohm

Zone 2

1

15V,2 30V

0

Wall Panel input micro controller

on

LINE

LINE

LINE/MIC

LINE/MIC

Power

/

MIC

/

MIC

P hantom

INSInIN

S

Out

Music only / Line out

Bal. input

D.C.supply

Amplifier

Click
suppressi

CUSL

Call Only

00

0

Zone 1

0

Zone 1

201

figure 2.1: Schematic overview of the Plena Mixer Amplifier

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2.4 Controls, connectors and
indicators

2.4.1 Front panel

See figure 2.2 for an overview of the controls and
indicators.
1 Power button.
2 Label holder for user-defined description of

microphone/line inputs - custom labels can be

created by user.
3 Master high tone control for microphone/line inputs.
4 Label holder for user-defined description of music

sources - custom labels can be created by user.
5 Master high tone control for music inputs.
6 Label holder for user-defined description of zone

names - custom labels can be created by user.
7 Master volume control - controls all inputs except

emergency and call station.
8 Output level meter (-18 db, 0 db)
9 Input level control:

• microphone/line 1

• microphone/line 2

• microphone/line 3

• microphone/line 4

• microphone/line 5

• microphone/line 6
10 Master low tone control for microphone/line inputs.
11 Music source selector (for music inputs 1, 2, and 3).
12 Music source volume control.
13 Master low tone control for music inputs.
14 Zone 1 selection button.
15 Zone 2 selection button.

16 Air inlet holes.

Note

Do not obstruct the airflow into the unit.

17 Headphone socket.

Note

Users can create custom labels for the:
microphone/line inputs, description of the music
sources, and audio output zones 1 and 2. These
labels can be attached to the mixer amplifier at
position numbers 2, 4, and 6 (see figure 2.2).
Colored pins can also be inserted at various
positions around the dial controls to indicate the
favorite settings for a particular application. For
more information on inserting and removing
pins, see section 4.3.2.

2.4.2 Plena PLE-WP2Z3S wall panel

The optional Plena PLE-WP2Z3S wall panel can be
used to remotely control the unit from a maximum of
four remote locations. The appearance of the wall panel
is matched to the Bosch loudspeaker volume controls.

The zone can be activated or deactivated, and the music
source can be easily changed. The status of each zone
and music source is indicated by an LED.
A standard CAT 5 cable is used to connect the wall
panel to the mixer-amplifier. The maximum distance is
200 m. Please refer to the relevant datasheet for more
information.

1

9 1110 12 13 14 15 1716

2 3 54

figure 2.2: Front panel

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6 7 8

B

Plena Mixer Amplifier | Installation and User Instructions | Description en | 10

2.4.3 Rear panel

See figure 2.3 for an overview of the connectors and
switches:

1 Cooling fan.

Note

Always allow adequate space at the rear of the
unit for ventilation.

2 Microphone/line 1 input with trigger, Euro style

pluggable screw terminal connector - DIP switch
settings for: chime, PTT (push to talk), mic/line,
speech filter, and phantom power (see number 3).

3 DIP switch for microphone/line 1 and microphone/

line 2 (see numbers 2 and 4 respectively).

4 Microphone/line 2 input, 3 pin Euro style pluggable

screw terminal connector - DIP switch settings for
speech filter, mic/line, VOX, and phantom power
(see number 3).

5 Microphone/line 3 input, 3 pin Euro style pluggable

screw terminal connector - DIP switch settings for
mic/line, and phantom power (see number 6).

6 DIP switch for microphone/line 3 and microphone/

line 4 (see numbers 5 and 7 respectively).

7 Microphone/line 4 input, 3 pin Euro style pluggable

screw terminal connector - DIP switch settings for
mic/line, and phantom power (see number 6).

8 Microphone/line 5 input, 3 pin Euro style pluggable

screw terminal connector - DIP switch settings for
mic/line, and phantom power (see number 9).

9 DIP switch for microphone/line 5 and microphone/

line 6 (see numbers 8 and 10 respectively).

10 Microphone/line 6 input, 3 pin Euro style pluggable

screw terminal connector - DIP switch settings for
mic/line, and phantom power (see number 9).

11 Mains voltage switch, C13 - 115/230

VAC 50/60 Hz.

12 Tel. emergency/70V input, Euro style pluggable

screw terminal connector - VOX function. This input
has highest priority.

13 Call station input, RJ-45 connector - PLE-2CS or

PLE-2CS-MM, chimes are in call station. This input
has second highest priority.

14 Remote control wall-panel-input, RJ-45 connector.

Wall panel incorporates: BGM source selection, and
zone on/off control.

15 Telephone emergency/70V input volume control -

control range -25 dB to 0dB (see number 12).

16 Chime volume control for microphone/line input 1

(see number 2).

17 Ducking level control for microphone/line inputs 1

and 2 and call stations.

18 Music input (number 1 disc), 2x RCA/cinch

connectors. Stereo, summed mono.

19 Music input (number 2 radio), 2x RCA/cinch

connectors. Stereo, summed mono.

20 Music input (number 3 auxiliary), 2x RCA/cinch

connectors. Stereo, summed mono.

21 Pre-out, amp in insert, 2x RCA/cinch connector -

can be used for EQ or feedback suppressor.
22 Master switch for line out or music (see number 23).
23 Music master output, XLR connector - switch setting

for line out, or music only (see number 22).
24 Outputs and 24 VDC in/out:

• Zone 1 output, Euro style pluggable screw terminal

connector - 70 V, 25 V and 4 Ohm.

• Zone 2 output, Euro style pluggable screw terminal

connector - 70 V, 25 V and 4 Ohm.

• Call only, Euro style pluggable screw terminal

connector 70 V.

• 24 VDC in/out:

• Input: 24 VDC backup power.

• Output: built in charger, maximum 0.5 A.

regulated output current. If battery charging is

not required, output can be used for volume

overrides or other purposes.
25 Mains fuse.
26 Ground connection screw.

Note

The unit must be earthed.

27 Mains connector (3-pole).

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Plena Mixer Amplifier | Installation and User Instructions | Description en | 11

1 2 4 5 113 6 7 8 109

Call

Trigger

Gnd

Telephone/Emergency Input

Gnd

0100V

Chime Ducking

12

figure 2.3: Rear panel

h

Off

Line

Off

Speec

Speech

Off

Off

Line

Chime

Flat

PTT

Mic

Flat

Phantom

Vox

Mic

PLE-2CS

MuteMix

Wall Panel

1(disc) 2(radio) 3(aux) Insert

Line

Mic

Phantom Off

Mic Line

In

Music

Line

Only

Out

Out

Mic Line

Off

Phantom

Mic Line

Output

Zone 1 Out Zone 2 Out

PLE-10M2-EU

2 Channel Mixer
115/230V~, 50/60Hz
S/N

Design & Quality
The Netherlands

F01U.066.938
8900 192 21001

Rated input
power: 40VA

Line fuse
T1L250V for 230V
T1.6L250V for 115V

Apparatus delivered
connected for 230V~

2928272418 19 20 21 2213 16 23 25 2614 15 17

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Intentionally left blank

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Plena Mixer Amplifier | Installation and User Instructions | Installation en | 13

3 Installation

3.1 Unpack unit

1 Remove the unit from the box, and discard the

packaging material according to local regulations.

2 Use your fingernails to carefully peel off the

protective plastic film from the label holders. Do not
use sharp or pointed objects.

3.2 Install unit in rack (optional)

The Plena Mixer Amplifier is intended for tabletop use,
but you can also mount the unit in a 19" rack
(see figure 3.1).

If you mount the unit in a rack, you must:

• ensure that it does not exceed the overheating
temperature (55 °C ambient).

• use the included Bosch mounting brackets
(LBC 1901/00).

• remove the 4 feet from the bottom of the unit.

3.3 Check settings/connections

1 Connect any additional equipment (see section 4.1

and 4.2).

2 Check the settings (see section 4.3).

3.4 Connect unit to mains

Caution

Potential equipment damage. Before
connecting power, always check the voltage
selector on the rear panel of the unit.

1 Make sure the voltage selector (115V/ 230V) is

correctly set for the country’s main voltage (see
figure 3.2).

2 Make sure the power switch on the front of the unit

is set to Off.

3 Connect the power cord to the mains connector and

plug it into the mains outlet.

1

figure 3.1: Installing the unit in a rack

B

figure 3.2: Power connection and voltage selector

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4 Connections and settings

4.1 Connecting inputs

4.1.1 DC supply (battery)

Caution

The connection cable must have an in-line fuse.
Use the type of fuse shown in the following
figure.

Caution

Make sure the unit is grounded.

The Plena Mixer Amplifier has a 24 VDC input
(terminal screw). This input can be used in mobile
applications, such as boats where 120 or 230 VAC is not
available or in applications that must continue to
operate in case of a power failure.

The Plena Mixer Amplifier has as a built in charger,
which charges the connected battery (or batteries if
connected in series). A separate battery charger is,
therefore, not required. The charger charges the battery
with a 0.5 A constant current until the battery voltage
reaches 27.4 VDC. The charger then switches over to
constant voltage charging (also known as float charging).
This means that a battery can be charged at the same
rate it is discharging, and thus full capacity battery can
be assured.

This type of charging is suited for low duty-cycle
applications where a relatively high current or power is
infrequently required.

Note

If battery charging is not required, the 0.5 A
maximum output current can be used for volume
overrides or other purposes instead.

When a 24 VDC battery is connected (typically
consisting of two 12 VDC lead-acid batteries in series),
the unit will operate on the supplied DC voltage.

­+

12 VDC

figure 4.1: Connecting a DC power supply

­+

12 VDC

FUSE

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4.1.2 Priority microphone (input 1)

The priority microphone (or a generic call station) that
can be used with push to talk (PTT) should be
connected to “microphone/line 1 input with trigger”.
The PTT mode can be activated by setting the DIP
switch (3) at the rear of the unit.

Microphone/line 1 input with trigger has priority over
all other microphone/line inputs. If, however, the “Tel.
emergency/70V input” receives a signal, all inputs
including microphone/line 1 input with trigger will be
overruled.

The microphone/line 1 input with trigger has a Euro
style pluggable screw terminal connector. This Euro
style pluggable screw terminal connector has a trigger
input which can be used in combination with the Euro
connector.

The priority microphone can be connected to the
microphone/line 1 input with trigger as follows:

• Euro connector with trigger. See figure 4.2.

• Euro connector only (without trigger).

Set the DIP switch settings for microphone/line 1 with
trigger, as required. See section 4.3.

Note

When connecting an unbalanced line level
(200 mV) signal to the microphone/line input,
connect it as follows: Signal to +, connect to ­and GND to ground.

figure 4.2: Euro connector with trigger

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4.1.3 Secondary microphone (input 2)

Connect a secondary microphone to “microphone/line
input 2”. See figure 4.3.

Microphone/line input 2 has a DIP switch (3) at the rear
of the unit for setting the VOX mode. If the DIP switch
is set to VOX, the microphone/line input will
automatically be switched when a signal is sensed at the
microphone/line 2 input. For example, when someone
speaks into the microphone, other sound will either be
muted or ducked, depending on the setting of the
ducking level control at the rear of the unit.
See section 4.3.

The Tel. emergency/70V input, Call station input, and
Microphone/line input 1 with trigger all have priority
over the Microphone/line input 2. Therefore, any signal
received on any one of these inputs will always be heard
regardless of the ducking level control setting for
Microphone/line input 2.

Set the DIP switch settings for microphone/line input 2
as required. See section 4.3.

4.1.4 Additional microphones
(inputs 3 through 6)

Connect additional microphones to microphone/line
inputs 3 through 6, as required. See figure 4.3. These
microphones will mix with the background music.

Set the DIP switch settings for microphone/lines 3
through 6, as required. See section 4.3.

figure 4.3: Connecting microphone inputs

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4.1.5 Emergency inputs

The Tel. emergency/70V input, with VOX functionality,
is used for receiving emergency announcements or
signals (such as a fire alarm). This input has absolute
priority, and will overrule all inputs when an emergency
announcement or signal is received.

Either a telephone line or a 70 V input signal can be
connected to the Euro style pluggable screw terminal
connector (12) at the rear of the unit. See section 4.1.5.1
and section 4.1.5.2.

Caution

Never connect telephone lines and a 70 V signal
to the Euro style connector at the same time.

To adjust the volume of the emergency announcement
or signal, turn the rotary dial (15) at the rear of the unit.
For safety reasons, the volume of the emergency
announcement or signal cannot be set to zero.

4.1.5.1 Connecting 70 Volt input signal

Connect the 70 Volt input signal as shown in figure 4.4.

Note

Tel. emergency input does not mute the
incoming signal so that an incoming pilot tone
will be fed to the zone outputs. With this feature
it is possible to use the mixer amplifier in a
Bosch Voice Alarm System when using end of
line boards (PLN-1EOL).
The signal that is delivered to the unit should be
quiet when a call is not made. The pilot tone and
frequencies below 300 Hz are filtered from the
trigger signal so that the input will not trigger
from a pilot tone or low frequency rumble.

The master volume control setting (7) does not influence
the volume setting of the emergency announcement or
signal.

figure 4.4: Connecting 70 Volt input signal

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4.1.5.2 Connecting telephone lines

Connect the telephone lines as shown in figure 4.5.

Caution

A connection to a telephone network must
always be made via a telephone coupler that
provides adequate isolation between the
telephone network (PBX) and the Plena system.
The telephone coupler must also meet all
relevant requirements for this type of
communication equipment as imposed by law
and/or responsible telecommunication
organizations in the country of use. Never try to
make a direct connection between the telephone
network and the mixer amplifier.

figure 4.5: Connecting emergency telephone lines

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4.1.6 Music source inputs

When using a CD player, tuner or other auxiliary
device for background music, connect the line-out
connectors of the music source to the appropriate line-in
connectors of the mixer amplifier.

figure 4.6: Connecting music source inputs

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4.2 Connecting outputs

4.2.1 Zone 1 and 2

Connect speakers to the 70 V, 25 V or 4 Ohm terminal
on the Euro style pluggable screw terminal connector
(24) at the rear of the unit.

Also see section 4.2.5 “Connecting speakers”.

4.2.2 Call only

Connect speakers to the 70 V terminal on the Euro style
pluggable screw terminal connector (24) at the rear of
the unit.

Also see section 4.2.5 “Connecting speakers”.

4.2.3 Music only

Use the music master output connector (23) to provide a
dedicated music out source for another device. For
example, the music master output can be connected to a
telephone coupler, so that callers can listen to music
when they are put on hold (see figure 4.7).

To select the dedicated music out source, set the master
switch for “line out or music only” (22) to “music only”.
Only the music inputs (18, 19, and 20) will be audible.
All other inputs, including the Tel. emergency/70V
input will not be sent to this output.

To hear all mixed inputs (microphone/line, emergency,
and music) set the master switch for “line out or music
only” (22) to “line out”.

4.2.4 Line out/ loop through

Use the Pre-out, amp in insert (21) external sound
processing equipment (e.g. an equalizer or Plena
feedback suppressor) to be connected between the
preamplifier and the power amplifier stages. See figure

4.7.

figure 4.7: Connecting music source inputs

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4.2.5 Connecting speakers

4.2.5.1 Constant voltage loudspeakers

figure 4.8: Connecting speakers

The mixer amplifier can drive 70 V constant voltage
loudspeakers.

Connect the loudspeakers in parallel and check the
loudspeaker polarity for in-phase connection. The
summed loudspeaker power should not exceed the
rated amplifier output power.

4.2.5.2 Low impedance loudspeakers

figure 4.9: Connecting speakers

Connect low impedance loudspeakers to the 4 Ohm/0
terminals. This output can deliver the rated output
power into an 4 Ohm load. Connect multiple
loudspeakers in a series/parallel-arrangement to make
the combined impedance 4 Ohm or higher. Check the
loudspeaker polarity for in-phase connection.

You can use the Call Only output for 3-wire remote
volume control override. You can also use this output as
an extra zone where announcements can be heard, but
not music.

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4.3 Unit settings

4.3.1 Rear panel settings

The unit can be quickly set-up for operation by setting
the following controls at the rear of the unit:

• DIP switches

• Rotary dials

• Master switch for line out or music only.

See the following tables for an overview of the settings
and typical examples of their use.

table 4.1: DIP switch settings

DIP switch On Off Typic a l exampl e ( On )

Chime
(mic/line 1)

PTT “Push to talk”
(mic/line 1 only)

Line Input signal from line. Input signal from

Speech filter Enhances clarity of speech, by

Phantom power Provides power to condenser

VOX
(mic/line 2 only)

Chime will be sounded at the
beginning of an announcement.

This input is muted when the push
to talk contact is open. When the
push to talk contact is closed:

• this input is available for
speech.

• a chime will sound, if selected.

• the music and other mic/line
inputs will be reduced in
volume to the level set by the
ducking level control knob.

cutting-off the lower frequencies
of the signal.

microphones.

Temporarily suppresses the
background music to an
adjustable “ducking level” (see
table 4.2) while you speak into the
microphone. The VOX mode is
normally used with hand-held
microphones such as the
LBC 2900/15. Background music
and announcements will be heard
in the selected zones. A chime is
not available in this mode.

Chime will not be sounded
at the beginning of an
announcement.
Push to talk off. The signal
will be mixed with the other
mic/line signals.
Microphone 1 will mix with
the background music or
the other microphones in
the selected zones.

microphone.
Speech filter inactive. Use for announcements

Phantom power
unavailable.

VOX inactive. Microphone
2 will mix with the
background music or the
other microphones in the
selected zones.

Announcement of train
departure time.

Users can have private
conversations during live
broadcasts (for example,
with an all call call­station, such as the
PLE-1CS).

Depends on set-up.

Enable phantom power if
you use electret or
condenser microphones.
Use to make casual
announcements (such as
announcing the winner of
a competition) while
temporarily suppressing
the background music to
an adjustable ducking
level.

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table 4.2: Rotary controls

Rotary control Effect Typical example

Ducking level control Sets the required ducking level when VOX and/or

push to talk is active (see table 4.1). When the
ducking level is set to mute, the music volume will be
fully attenuated; when the ducking level is set to mix,

Set the ducking level control to
mute if you want the
announcement to be heard without

background music.
both music and speech inputs can be heard - music
and speech will be mixed. When ducking the music
input is ducked (attenuated), the microphone/line
inputs are always muted when a call is made.

Chime volume
control

Te l ep h on e
emergency/70V
volume control

Alters the chime volume. The mid range is -8 dB
(40 V), which should be sufficient for most
applications. Test the chime by switching on
microphone 1. Remove the microphone after testing
if it is not further required.
Attenuates the emergency announcement or signal.
Control range from -25 dB to 0 dB. For safety
reasons, the volume of the emergency
announcement or signal cannot be fully set to zero.

Set the volume of the chime to a

higher level when the system is

being used in large open areas or

when important announcements

have to made.

Set the volume of the emergency

announcement to a higher level

when the system is being used in

large open areas.

Note

When PTT or VOX are selected, the ducking
control controls between 3 dB attenuation (very
little ducking) to –∞ dB (muted).
When ducking, the music is also present on the
Call only output. If you do not want this, set the
ducking control to mute.
When ducking, music in a non-selected zone is
also affected.

table 4.3: Master switch for line out or music only

Slide switch setting Effect Typical example

Line out All mixed inputs (microphone/line, emergency, and

Various set-ups are possible.

music) are available.

Music only A dedicated music out source is available for another

external device. Only the music inputs (18, 19, and

20) are available. All other inputs, including the
Tel. emergency/70V input will be overridden.

The “music master output” can be
connected to a telephone system,
so that callers can listen to music
when they are put on hold.

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4.3.2 Pin settings and labelling

Users can create custom labels for the: microphone/line
inputs, description of the music sources, and audio
output zones 1 and 2. These labels can be attached to
the mixer amplifier at position numbers 2, 4, and 6 (see
figure 2.2). Colored pins can also be inserted at various
positions around the dial controls to indicate the favorite
settings for a particular application.

The pins are engineered in such a way that they cannot
be taken out by hand. This is to prevent tampering. The
pins are intended to be inserted once, during installation
of the unit. The silver pins should be used to indicate
the preferred settings of the unit. The red pins can
optionally be used to indicate the maximum setting of a
knob.

If these settings have to be changed, use a pair of soft­tipped pliers to carefully remove the pins. If you do not
have a pair of soft-tipped pliers, you can use ordinary
pliers instead, but first place some plastic tape on the
tips of the pliers to prevent damaging the front of the
unit.

To remove the clear plastic covers in front of the labels:
1 Carefully insert a small screwdriver into the cut-out

at the bottom of the plastic cover.

2 Gently lift the cover, and bend it in the middle. Take

care not to force the cover or the front panel.

To reattach the plastic covers with paper labels:
1 Insert the paper label into the holder at the front of

the unit.

2 Pick up the cover, and then bend it slightly in the

middle by hand.

3 Fit the cover into the slot at the front of the unit, and

then gently release the cover, making sure that the
paper label stays in place.

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5Operation

5.1 Switch on and off

5.1.1 Switch on

Caution

Potential equipment damage. Before applying
power, always check the voltage selector at the
rear of the unit.

1 Make sure the voltage selector (115V/ 230V) is

correctly set for the country’s main voltage
(see figure 5.1).

2 Set the power button (1) on the front of the unit to

On - pushed in (see figure 5.2).

5.1.2 Switch off

Set the power button (1) on the front of the unit to
Off - popped out (see figure 5.2).

figure 5.1: Voltage selector

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5.2 Microphone/line controls

Use the volume controls (9) to individually control the
sound level of microphone/line inputs 1 through 6.

Note

Users can create custom labels for the:
microphone/line inputs, description of the music
sources, and audio output zones 1 and 2. These
labels can be attached to the mixer amplifier at
position numbers 2, 4, and 6 (see figure 5.2).
Colored pins can also be inserted at various
positions around the dial controls to indicate the
favorite settings for a particular application.

5.3 Music controls

5.3.1 Source selection

Use the music source selector (11) to select one of the
connected music sources.

5.3.2 Volume control

Use the music source volume control (12) to control the
sound level of the selected music source.

5.4 Tone control

5.4.1 Introduction

The unique tone controls provide separate control for
mic/line inputs and music inputs so that the voice on
the microphones can be specifically optimized for
excellent speech or singing. Correspondingly, the tone
controls for background music provide the most
appropriate music reproduction.

The tone controls are not standard bass and
treble controls: they can be used as a traditional tone
control with high and low control, but also have a
powerful contour that addresses problems found in real
situations.

5.4.2 Microphone/line tone control

The tone control for the microphone and line inputs
boosts warmth in voices without boosting rumble, and
cuts rumble without loosing warmth in the low
frequencies. In the high frequencies, the tone control
boosts sparkle without adding sharpness, but when
cutting is first, cuts harshness and sharpness without
reducing clarity.

Use the Hi (high) and Lo (low) tone controls (see
figure 5.2, numbers 3 and 10) to collectively change the
tone of microphone/line inputs 1 through 6.

5.4.3 Music tone control

The tone control for the music inputs boosts deep bass
first without making the sound boomy, and cuts rumble
without loosing warmth in the low frequencies. In the
high frequencies, the tone control is similar to the
microphone inputs, with slightly different frequencies to
suit music reproduction.

Use the Hi (high) and Lo (low) tone controls (see
figure 5.2, numbers 5 and 13) to change the tone of the
selected music source.

1

9 1110 12 13 14 15 1716

figure 5.2: Front panel

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2 3 54

6 7 8

B

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5.5 Output controls

5.5.1 Zone selection

Use the zone selection buttons (14 and 15) to route the
music/microphone, line mix from the amplifier output
to loudspeaker zone 1 and/or loudspeaker zone 2.

Announcements, however, are always routed to both
zones, irrespective of the position of the zone selection
buttons.

5.5.2 Master volume control

Use the master volume control dial (7) to collectively
control the sound level of all outputs, except the
emergency announcement/signal.

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6 Technical data

6.1 Electrical

6.1.1 Mains power supply

Voltage

115 - 230 VAC, ±10%, 50/60 Hz

Inrush Current PLE-2MA120-US

8/16 A (23 0 /115 VAC)

Inrush Current PLE-2MA240-US

9/19 A (23 0 /115 VAC)

6.1.2 Battery power supply

Voltage

24 VDC, ±15%

Current PLE-2MA120-US

6 A

Current PLE-2MA240-US

12 A

Charge current

0.5 ADC

Charge float voltage

27.4 VDC

6.1.3 Power consumption

PLE-2MA120-US (mains)

400 VA

PLE-2MA240-US (mains)

800 VA

6.1.4 Performance

Frequency response

50 Hz to 20 kHz (+1/-3 dB @ -10 dB ref. rated
output)

Distortion

<1% @ rated output power, 1 kHz

Low Control

Max -12/+12 dB (frequency is level dependent)

Hi Control

Max -12/+12 dB (frequency is level dependent)

6.1.5 RJ-45 input 2 x

Call station input

For PLE-2CS(MM)

Wall panel input

For PLE-WP3S2Z

6.1.6 Mic/line input 6 x

Input 1 (Push-to-talk contact with ducking
functionality)

5-pin Euro style, balanced, phantom

Input 2-6 (VOX with ducking functionality on
input 2)

5-pin Euro style, balanced, phantom

Sensitivity

1 mV (mic); 200 mV (line)

Impedance

>1 kohm (mic); >5 kohm (line)

S/N (flat at max volume)

63 dB

S/N (flat at min volume/muted)

>5 dB

Dynamic range

100 d B

S/N (flat at max volume)

>63 dB (mic); >70 dB (line)

S/N (flat at min volume/muted)

>75 dB

CMRR

>40 dB (50 Hz to 20 kHz)

Headroom

>25 dB

Speech filter

-3 dB @ 315 Hz, high-pass, 6 dB/oct

Phantom power supply

16 V via 1.2 kohm (mic)

Speech filter

-3 dB @ 315 Hz, high-pass,
6 dB/oct

VOX (input 1 & 2)

attack time 150 ms; release time 2 s

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6.1.7 Music inputs 3x

Connector

Cinch, stereo converted to mono

Sensitivity

200 mV

Impedance

22 kohm

S/N (flat at max volume)

>70 dB

S/N (flat at min volume/muted)

>75 dB

Headroom

>25 dB

6.1.8 Emergency / telephone 1 x

Connector

7-pin, Euro style pluggable screw terminal

Sensitivity tel

100 mV – 1 V adjustable

Sensitivity 70V

7 V – 70 V adjustable

Impedance

>10 kohm

S/N (flat at max volume)

>65 dB

VOX

threshold 50 mV; attack time 150 ms; release time 2 s

6.1.9 Loop through insert 1 x

Connector

Cinch

Nominal level

1 V

Impedance

>10 kohm

6.1.10 Master/music output 1 x

Connector

3-pin XLR, balanced

Nominal level

1 V

Impedance

<100 ohm

6.1.11 Loudspeaker outputs 70 V, 25 V*

Connector

Screw, floating

Max / rated PLE-2MA120-US

180 W / 120 W

Max / rated PLE-1906/10

360 W / 240 W

6.1.12 Loudspeaker output 4 Ohm*

Connector

Euro style pluggable screw terminal, floating

PLE-2MA120-US

22 V (120 W)

PLE-2MA240-US

31 V (240 W)

* Subtract 1 dB for 24 V battery operation.

6.2 Mechanical

Dimensions (H x W x D)

100 x 430 x 270 mm (19" wide, 2U high)

Mounting

Stand-alone, 19" rack

Color

Charcoal

Weight (PLE-2MA120-US)

Approx. 10.5 kg

Weight (PLE-2MA240-US)

Approx. 12.5 kg

6.3 Environmental

Operating temperature

-10 to +55 ºC

Storage temperature

-40 to +70 ºC

Relative humidity

<95%

Acoustic noise level of fan

<33 dB SPL @ 1 m temperature control

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For more information visit

www.boschsecuritysystems.com

© Bosch Security Systems B.V.

Data subject to change without notice

2007-10 | PLE-2MA120-US, PLE-2MA240-US en