Communications Systems | PLE‑2MAxx0‑US Plena Mixer Amplifier
PLE‑2MAxx0‑US Plena Mixer Amplifier
▶ 6 microphone/line inputs plus 3 music source inputs
▶ 70 V, telephone and a call station input with priority &
▶ 2 zones and announcement only output
▶ Voice‑activated emergency override
▶ High output power 120 and 240 Watts
▶ 2-tone chime built in (7 more chimes optional with call
▶ Outputs for line out, music only out and insert point
▶ 24 V backup power with built‑in 24 V charger
▶ Separate tone controls for microphones and music
These Plena mixer amplifiers are high performance,
professional public address units with modern
state‑of‑the‑art features. They are easy to use, taking the
complexity away from the user and putting it where it
belongs, inside the equipment. Providing a crisp call or
clear music is as easy as turning on the radio.
When one or both inputs are configured to have priority, the
amount of attenuation of the RCA input can be set between
‑2 dB (little attenuation) or -∞ dB (mute). This provides a
talk-over or voice-over function. Input channels 1 and 2 also
feature selectable speech filters to enhance the clarity of
The amplifier is also surprisingly affordable, without
sacrificing features such as ducking, priority and flexibility.
Music inputs
Microphone and line inputs
All mic/line inputs can be switched between microphone
level and line level sensitivity. The inputs are balanced but
can be used unbalanced. Phantom power can be switched
on 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 the PTT
(push to talk). A 2-tone chime can be configured to
precede an announcement.
Input 2 can be switched automatically if a signal is fed
to the input, i.e., if someone speaks into the
microphone (VOX activation).
Separate music inputs are available with their own input
selector and volume control. The user can choose a music
source like a CD player or radio (like the PLN-DVDT), and
set the level of music.
You can set the desired sound for the music source separate
from the mic/line inputs. So if the music needs boosted low
frequencies, this does not lead to muddy sounding voices
from the microphones. A truly unique feature in its class.
Personalized settings
More unique features are available such as detachable
labels where the user can write the names for inputs, music
sources and zones. These labels can then be mounted on
the front, protected by the clear window.
Another useful feature is to indicate preferred settings on
the front panel by inserting colored pins at the preset levels
of all knobs. You can then instruct a user to set all the
controls to the silver pins to configure the system for their
particular use. A second user can set all controls to the red
pins for their configuration.
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Tone controls
The unique tone controls provide separate control for mic/
line inputs and music inputs so that the microphone signals
can be specifically optimized for excellent voice
reproduction. Correspondingly, the tone controls for
background music provide the equalization appropriate
music reproduction.
The mixer amplifier has two zone outputs. The music can be
switched on and off in the zones via the front panel and
optional wall panel. Announcements from the PLE-2CS twozone call station can be routed to zone 1 or zone 2, or both.
Announcements from the tel/70 V input or inputs 1 & 2 are
routed to both zones. Input 1 can be used for a PLE-1CS allcall call station or any other microphone or call station with
a PTT contact.
In addition, the tone controls are not standard bass and
treble controls. Our experience has led us to develop a tone
control that can be used as a traditional tone control with
high and low control, but has a powerful contour that
addresses the problems found in real situations.
The tone control for the microphone and line inputs boost
warmth in voices without boosting rumble and cuts rumble
without loosing warmth in the low frequencies. In the higher
frequencies, the tone control boosts sparkle without adding
sharpness, but when cutting is first, cuts harshness and
sharpness without reducing clarity.
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
For easy integration with another PA system or a telephone
paging system, a telephone / 70 V emergency input with
VOX activation is provided. It has its own preset volume
control and overrides all other inputs, including call station
and inputs 1 and 2. The unit also has a line output to add
amplifiers for larger systems, with more output power, this
output can be switched to music only so that, for instance,
music on hold can be provided for the telephone system.
Insert (loop through) input and output connections enable
external sound processing equipment, such as an equalizer
or the Plena feedback suppressor, to be connected
between the preamplifier and the power amplifier stages.
Output status
An LED VU meter displays the master output level. A
headphone jack, below the VU meter, provides the mixer
output signal before zone selection so that it is possible to
listen to the output before the signal is sent to the zone. 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.
Controls and indicators
On/off switch
Power on LED
LED VU meter for master output (LEDs for -18, -12 -6,
-3, 0 dB)
Master volume knob
Six volume knobs for microphone inputs
Knob for treble level
Knob for bass level
Headphone jack
Two zone selector buttons
Background music button
Dip switches
Chime level
Ducking level
Tel/70 V volume control
See Technical Specifications.
These Plena mixer amplifiers come in 120 and 240 Watt
output power options. This power is directly available on
25 V and 70 V constant voltage connections and on a low
impedance connection for a 4 ohm load. Moreover, the
amplifiers have a separate 70 V call-only output channel for
addressing areas where only priority announcements are
required. The call-only output can also be used for 3-wire
remote, volume control override.
Certifications and Approvals
EMC emission
acc. to EN 55103-1
EMC immunity
acc. to EN 55103-2
PLE‑2MAxx0‑US Plena Mixer Amplifier | 3
Installation/Configuration Notes
RJ-45 input
Call station input
Wall panel input
Mic/Line input
Input 1
5-pin Euro style, balanced, phantom
Input 2-6
3-pin Euro style, balanced, phantom
1 mV (mic); 200 mV (line)
>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
93 dB
S/N (flat at max volume)
>63 dB (mic); >70 dB (line)
S/N (flat at min volume/muted)
>75 dB
CMRR (mic)
>40 dB (50 Hz to 20 kHz)
>17 dB
Speech filter
-3 dB @ 315 Hz, high-pass, 6 dB/
Phantom power supply
16 V via 1.2 kohm (mic)
Speech filter
-3 dB @ 315 Hz, high-pass,
6 dB/oct
VOX (input 2)
Attack time 150 ms; release time
Music inputs
Mains power supply
RCA, stereo converted to mono
115 - 230 VAC ±10%, 50/60 Hz
200 mV
Inrush Current PLE-2MA120-US
8/16 A (230/115 VAC)
22 kohm
9/19 A (230/115 VAC)
S/N (flat at max volume)
>70 dB
S/N (flat at min volume/muted)
>75 dB
>25 dB
Rear view
Parts Included
PLE-2MA120-US / PLE-2MA240-US Plena Mixer Amplifier
Power cord
Set of 19”mounting brackets
Technical Specifications
Inrush Current PLE-2MA240- US
Battery power supply
24 VDC ±15%
Current PLE-2MA120- US
Emergency / telephone
Current PLE-2MA240- US
12 A
Charge current
0.5 ADC
7-pin, Euro style pluggable screw
Charge float voltage
27.3 VDC
Sensitivity tel
1 V maximum
Sensitivity 70V
70 V maximum
>10 kohm
S/N (flat at max volume)
>65 dB
Threshold 50 mV; attack time
150 ms; release time 2 s
Nominal level
>10 kohm
Power consumption
PLE-2MA120- US (mains)
400 VA
PLE-2MA240- US (mains)
800 VA
Frequency response
50 Hz to 20 kHz (+1/‑3 dB @
‑10 dB ref. rated output)
<1% @ rated output power, 1 kHz
Low Control
Max -12/+12 dB (frequency is
setting dependent)
High Control
Max -12/+12 dB (frequency is
setting dependent)
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Master/music output
3-pin Euro style, balanced
Nominal level
<100 ohm
Loudspeaker outputs 25 / 70 V and
4 ohm*
Screw, floating
Max / rated PLE-2MA120‑US
180 W / 120 W
Max / rated PLE-2MA240‑US
360 W / 240 W
Loudspeaker output 4 ohm*
Euro style pluggable screw terminal, floating
31 V (120 W)
44 V (240 W)
* Subtract 1 dB for 24 V battery operation.
Dimensions (H x W x D)
100 x 430 x 270 mm
(19" wide, 2U high)
Stand-alone, 19" rack
Weight (PLE-2MA120-US)
Approx. 23.2 lb
Weight (PLE-2MA240-US)
Approx. 27.6 lb
Operating temperature
+14 ºF to +131 ºF
Storage temperature
-40 ºF to +158 ºF
Relative humidity
Acoustic noise level of fan
<40 dB SPL @ 1 m
temperature controlled
Ordering Information
PLE‑2MA120‑US Plena Mixer Amplifier
120 W
PLE‑2MA240‑US Plena Mixer Amplifier
240 W
Bosch Communications Systems
12000 Portland Avenue South
Burnsville, Minnesota, 55337, USA
Phone: +1-800-392-3497
Fax: +1-800-955-6831
Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
© Bosch Security Systems Inc. 2008 | Data subject to change without notice
T4405225227 | Cur: en-US, V2, 12 Jun 2008
Bosch Security Systems Pte Ltd
38C Jalan Pemimpin
Singapore 577180
Phone: +65 6319 3450
Fax: +65 6319 3499
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