Extron electronic Stereo Amplifier MPA 152 PLUS User Manual

User Guide  
Audio  
MPA 152 Plus  
ENERGY STAR® Qualified Stereo Mini Power Amplifier  
68-1320-03 Rev. A  
11 13  
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FCC Class B Notice  
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 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. There is no guarantee that interference will not occur. If this equipment  
does cause interference to radio or television reception, which can be determined by turning  
the equipment off and on, you are 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 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.  
NOTE: For more information on safety guidelines, regulatory compliances, EMI/  
EMF compatibility, accessibility, and related topics, see the Extron Safety and  
Regulatory Compliance Guide on the Extron website.  
Copyright  
© 2013 Extron Electronics. All rights reserved.  
Trademarks  
All trademarks mentioned in this guide are the properties of their respective owners.  
The following registered trademarks(®), registered service marks(SM), and trademarks(TM) are the property of  
RGB Systems, Inc. or Extron Electronics:  
Registered Trademarks (®)  
AVTrac, Cable Cubby, CrossPoint, eBUS, EDID Manager, EDID Minder, Extron, Flat Field, GlobalViewer, Hideaway, Inline,  
IP Intercom, IP Link, Key Minder, LockIt, MediaLink, PlenumVault, PoleVault, PowerCage, PURE3, Quantum, SoundField,  
SpeedMount, SpeedSwitch, System Integrator, TeamWork, TouchLink, V‑Lock, VersaTools, VN‑Matrix, VoiceLift, WallVault,  
WindoWall, XTP and XTP Systems  
Registered Service Mark(SM) : S3 Service Support Solutions  
Trademarks (TM)  
AAP, AFL (Accu‑Rate Frame Lock), ADSP (Advanced Digital Sync Processing), AIS (Advanced Instruction Set), Auto‑Image,  
CDRS (Class D Ripple Suppression), DDSP (Digital Display Sync Processing), DMI (Dynamic Motion Interpolation),  
Driver Configurator, DSP Configurator, DSVP (Digital Sync Validation Processing), FastBite, FOXBOX, IP Intercom HelpDesk,  
MAAP, MicroDigital, ProDSP, QS‑FPC (QuickSwitch Front Panel Controller), Scope‑Trigger, SIS, Simple Instruction Set,  
Skew‑Free, SpeedNav, Triple‑Action Switching, XTRA, ZipCaddy, ZipClip  
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Conventions Used in this Guide  
Notifications the following are used:  
ATTENTION: Attention indicates a situation that may damage or destroy the product  
or associated equipment.  
NOTE: A note draws attention to important information.  
Specifications Availability  
Product specifications are available on the Extron website, www.extron.com.  
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Contents  
Introduction............................................................ 1  
Important Safety Instructions.............................. 1  
About the MPA 152 Plus .................................... 2  
MPA 152 Plus Features ...................................... 2  
Panels and Cabling .............................................. 4  
MPA 152 Plus Rear Panel Features .................... 4  
Power Connector ........................................... 4  
Audio Inputs ................................................... 6  
Remote Control .............................................. 7  
Audio Output.................................................. 9  
Setup and Operation.......................................... 10  
Front Panel Features and Operation ................. 10  
Setting Input Level........................................ 10  
Setting Bass and Treble................................ 11  
Remote Control Options................................... 11  
Defeating the Auto Power‑down Timer ............. 12  
Troubleshooting................................................ 13  
Amplifier Fails to Exit Standby Mode  
Promptly...................................................... 13  
Amplifier Enters Standby Mode Too Early...... 13  
Mounting............................................................... 14  
Rack Mounting................................................. 14  
UL Guidelines for Rack Mounting.................. 14  
Rack Mounting Procedure ............................ 15  
Back of the Rack Mounting .......................... 15  
Other Mounting Options ................................... 15  
MPA 152 Plus • Contents  
v
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MPA 152 Plus • Contents  
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Introduction  
This manual contains information about the Extron MPA 152 Plus mini power amplifier  
with instructions for experienced installers on how to install, configure, and operate the  
equipment. Unless otherwise specified, in this manual “amplifier” or “MPA” refer to the  
MPA 152 Plus.  
This section provides the following information:  
Important Safety Instructions  
1. Read these instructions.  
2. Keep these instructions.  
3. Heed all warnings.  
4. Follow all instructions.  
5. Do not use this apparatus near water.  
6. Clean only with dry cloth.  
7. Do not block any ventilation openings. Install in accordance with the instructions of the  
manufacturer.  
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other  
apparatus (including amplifiers) that produce heat.  
9. Do not defeat the safety purpose of the polarized or grounding‑type plug. A polarized  
plug has two blades with one wider than the other. A grounding type plug has two  
blades and a third grounding prong. The wide blade or the third prong are provided  
for safety. If the provided plug does not fit into the outlet, consult an electrician for  
replacement of the obsolete outlet.  
10. Protect the power cord from being walked on or pinched particularly at plugs,  
convenience receptacles, and the point where they exit from the apparatus.  
11. Only use attachments or accessories specified by the manufacturer.  
12.  
Use only with the cart, stand, tripod, bracket, or table specified by the  
manufacturer, or sold with the apparatus. When a cart is used, use caution  
when moving the cart/apparatus combination to avoid injury from tip‑over.  
13. Unplug this apparatus during lightning storms or when unused for long periods of time.  
14. Refer all servicing to qualified service personnel. Servicing is required when the  
apparatus has been damaged in any way, such as if the power‑supply cord or plug  
is damaged, liquid has been spilled or objects have fallen into the apparatus, the  
apparatus has been exposed to rain or moisture, does not operate normally, or has  
been dropped.  
MPA 152 Plus • Introduction  
1
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About the MPA 152 Plus  
The MPA 152 Plus is an ENERGY STAR qualified amplifier with an Extron exclusive, highly  
efficient, advanced Class D amplifier design. It also features patented CDRS (Class D  
Ripple Suppression) technology that provides a smooth, clean audio waveform and an  
improvement in signal fidelity over conventional Class D amplifiers. The high efficiency  
design generates very little heat and allows the amplifier to be fanless and operated in  
environments with little or no ventilation.  
This stereo integrated mini power amplifier delivers up to 15 watts (rms) per channel stereo  
or dual mono into a 4 ohm sound system, or 8 watts (rms) per channel into an 8 ohm  
system. This model features a 90 dB signal‑to‑noise ratio with 0.1% THD+N, offering  
exceptional performance for speaker systems requiring compact, economical, audio  
amplification.  
Front panel controls allow easy adjustment of bass and treble volume and input level.  
The quarter rack size allows a variety of mounting options. The unit complies with UL 2043  
for smoke and heat release for in‑the‑ceiling installations. It can be installed in the plenum  
space of the ceiling. Alternatively, the units can be mounted on a tabletop, in a rack, under a  
desk, or in a projector mounting kit.  
EO  
D
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Y
A
L
P
IS  
D
X
F
AU  
EO  
F
O
D
I
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ON  
PC  
E
M
U
OL  
V
E
G
AG  
FI  
M
N
I
E
O
T
C
U
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US  
L
P
IP  
4
0
1
C
L
M
Projector  
n
o
r
t
x
E
RS-232 or  
IR Projector  
control  
Extron  
MLC 104 IP Plus  
MediaLinkController  
with IP Link  
Audio  
OUPT  
Audio  
Video  
4Ω  
2
R
C
REMO  
/
8Ω  
L
ASS  
G
L
C
N
TE  
WIRI  
Audio  
G
50m  
A
VV  
10  
us  
S
T
Pl  
PU  
2
R
5
I
N
1
A
S-Video  
MP  
E
OW  
P
R
X
1
2
V
M
A
RGBHV  
7A  
0.  
L
Audio  
Laptop  
Extron  
MPA 152 Plus  
Mini Power  
Ampliꢀer  
DVD/VCR  
Combo  
Extron  
SM 3  
Full-range  
Speakers  
Figure 1. Typical Application for the MPA 152 Plus  
MPA 152 Plus Features  
30 watts (rms) output power — Delivers up to 15 watts (rms) per channel, stereo or  
dual mono, into a 4 ohm speaker system or up to 8 watts (rms) per channel into an 8 ohm  
system. Provides significant audio output for small integration projects with moderate sound  
system needs.  
Improved signal-to-noise ratio — The 90 dB unweighted signal‑to‑noise ratio allows  
very low‑noise operation, ensures quiet, hiss‑free amplification, and maintains audio signal  
integrity.  
ENERGY STAR qualified amplifier — The MPA 152 Plus conserves energy and reduces  
operating costs.  
MPA 152 Plus • Introduction  
2
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Defeatable auto power-down timer for 24/7 applications — Ensures that the  
amplifier is always active for 24/7 operation in critical applications, while still retaining the  
ENERGY STAR qualification.  
Extron patented CDRS - Class D Ripple Suppression — CDRS is an Extron patented  
technology that provides a smooth, clean audio waveform and an improvement in signal  
fidelity over conventional Class D amplifier designs. CDRS eliminates the high frequency  
switching ripple characteristic of Class D amplifiers, a source of RF emissions which can  
interfere with sensitive AV equipment such as wireless microphones.  
Front panel bass, treble, and input level controls — These are flush mounted and  
detented. They allow quick attenuation of input signal and 10 dB bass and treble shelving  
controls.  
Stereo or Dual Mono toggle switch — Allows the user to choose between stereo output  
or to sum the left and right inputs and produce dual mono outputs (see figure 7 on page 9).  
This eliminates the need for external summing products in monoaural installations.  
UL 2043 plenum rated — The MPA 152 Plus complies with UL 2043 for smoke and  
heat release for installation within a plenum airspace above a drop ceiling (power supply  
excluded). Above‑the‑ceiling placement conceals the amplifier to prevent theft, and is  
convenient for installing equipment when space inside the room is limited.  
Three audio inputs — Accept balanced or unbalanced stereo line‑level signals on a  
captive screw connector and unbalanced stereo line‑level signals on an RCA stereo pair,  
and a 3.5 mm stereo mini jack. This ensures the amplifier can be easily integrated with a  
wide variety of sources and projectors.  
The three stereo inputs are individually buffered and can be connected to three separate  
sources at the same time without altering performance.  
Auto power-down with fast power-up — The MPA 152 Plus meets ENERGY STAR  
qualification requirements with an auto power‑down feature that automatically places  
the amplifier into standby after 25 minutes of inactivity, dramatically reducing power  
consumption. It quickly returns to full power status in less than one second upon signal  
detection. This feature can be defeated to allow for 24/7 operation.  
Quick-plug speaker outputs — Speaker output is on a screw‑lock captive screw  
connector for quick installation.  
Volume and mute remote control — A rear panel, three‑pin captive screw remote input  
connector allows remote adjustment of volume and muting.  
Always-on clip limiting — Reduces gain automatically to prevent amplifier clipping.  
Compact size — The amplifiers are housed in a 1U high, 3 inch deep, quarter rack wide  
metal enclosure, which offers flexible mounting options.  
MPA 152 Plus • Introduction  
3
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Panels and  
Cabling  
This section discusses the MPA 152 Plus rear panel features and cabling.  
MPA 152 Plus Rear Panel Features  
The rear panel of the MPA 152 Plus (shown in figure 2 below) allows the user to connect  
power (see below), audio input (see page 6), remote control (see page 7), and audio  
output (see page 9).  
MPA 152 Plus  
8Ω /  
4Ω  
CLASS 2  
WIRING  
INPUTS  
R
C
L
POWER  
12V  
0.7A MAX  
V
10V  
G
50mA  
R
L
L
R
1
2
3
4
5
6
Figure 2. MPA 152 Plus Rear Panel Features  
Power Connector  
Power connector — The MPA 152 Plus ships with the Extron 24 watt PS 1220  
desktop power supply.  
a
ATTENTION: When the PS 1220 power supply is connected to the  
MPA 152 Plus, it must not be shared with any other devices.  
Connect one end of the DC power cord to one of the two pole, 3.5 mm captive screw  
outlets on the power supply. Connect the other end into the power receptacle on the  
rear panel of the amplifier, as shown in figure 3 on the following page. The power cord  
connectors are correctly wired when shipped.  
MPA 152 Plus • Panels and Cabling  
4
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PS 1220  
Power Supply  
MPA 152 Plus  
Ampliꢀer  
POWER  
12V  
0.7A MAX  
DC Power  
Outputs  
AC Power Cord  
Power  
Receptacle  
DO NOT USE  
DC Power Cord  
Captive Screw  
Connector  
Captive Screw  
Connector  
Tie  
Wrap  
Power Supply  
Output Cord  
Figure 3. Power Connector  
ATTENTION:  
Always use a power supply supplied by or specified by Extron. Use of an  
unauthorized power supply voids all regulatory compliance certification and  
may cause damage to the supply and the end product.  
The amplifier is suitable for use in environmental air space in accordance  
with Section 300.22.C of the National Electrical Code, and Sections 2‑128,  
12‑010(3) and 12‑100 of the Canadian Electrical Code, Part 1, C22.1.  
Unless otherwise stated, the AC/DC adapters are not suitable for use in air  
handling spaces or in wall cavities. The power supply is to be located within  
the same vicinity as the Extron AV processing equipment in an ordinary  
location, Pollution Degree 2, secured to the equipment rack within the  
dedicated closet, podium, or desk.  
Although the amplifier is plenum rated, the power supply provided with it  
is not. The power supply must not be placed in the plenum space. Cables  
to and from the amplifier must also be plenum rated. The DC power cord  
provided with the unit is not plenum rated.  
The installation shall be in accordance with the applicable provisions of  
National Electrical Code ANSI/NFPA 70, article 725 and the Canadian  
Electrical Code part 1, section 16.  
The power supply shall not be permanently fixed to building structure or  
similar structure.  
The length of the exposed wires in the stripping process is critical. The ideal  
length is 3/16 inches (5 mm). Any longer and the exposed wires may touch,  
causing a short circuit between them. Any shorter and the wires can be easily  
pulled out even if tightly fastened by the captive screws.  
NOTE: Do not tin the wires. Tinned wire does not hold its shape and can become  
loose over time.  
MPA 152 Plus • Panels and Cabling  
5
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Audio Inputs  
Use the rear panel receptacles (see figure 4) to connect audio sources to the amplifier. Wire  
the connectors as shown below.  
INPUTS  
R
L
L
R
2
3
4
Figure 4. Audio Inputs  
Tip (+)  
RCA unbalanced stereo input connectors — These  
receptacles accept unbalanced, line level audio signals. The input  
can be stereo, using two RCA connectors, or mono, using a  
single RCA connector plugged into the left receptacle.  
b
Sleeve (  
)
RCA Connector  
If unused, the receptacles automatically terminate to lower the  
noise floor.  
Tip (L)  
Ring (R)  
3.5 mm unbalanced stereo input jack — This input also  
accepts unbalanced, line level audio signals through a 3.5 mm  
tip‑ring‑sleeve (TRS) stereo connector. If unused, the receptacle  
automatically terminates to lower the noise floor.  
c
d
Sleeve (  
)
3.5 mm TRS Connector  
Captive screw balanced  
or unbalanced audio input  
connector — This 5‑pole 3.5 mm  
Tip  
Ring  
Sleeves  
Tip  
Ring  
Tip  
Sleeve  
Tip  
Sleeve  
captive screw receptacle accepts line  
level, balanced or unbalanced, mono  
Unbalanced Stereo Input  
Balanced Stereo Input  
or stereo audio signals.  
See the attention (on page 5) and  
Tip  
Ring  
Tip  
note (on page 5) for important  
Sleeve  
Sleeve  
information about connecting wires to  
captive screw connectors.  
Unbalanced Mono Input  
Balanced Mono Input  
Depending on the position of the  
front panel toggle switch (see figure 8 on page 10), the right and left channels may be  
output as a stereo signal or as a dual mono signal. See Audio Output on page 9 for  
more information.  
MPA 152 Plus • Panels and Cabling  
6
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Remote Control  
Remote input connector — This 3‑pin, captive screw port allows  
an audio controller to control volume and mute levels remotely. See  
Remote Control Options on page 11 if using a MediaLink controller.  
e
V
10V  
C
G
50mA  
Wiring for remote control  
Options for remote control include the Extron VC 50, VCM 100 AAP, VCM 100 MAAP,  
VCM 200 series, and MLA VC10 Plus. Third party 10k potentiometer volume controllers can  
also be connected to this port.  
Figure 5 and the instructions below show the wiring for the VCM 100 MAAP. Wiring other  
remote control connectors is similar.  
V
10V  
C
G
50mA  
10 V (Pin 1)  
2k ohms  
Vol/Mute  
(Pin 2)  
Volume Pot  
10k ohms  
Mute  
Switch  
Ground (Pin 3)  
Figure 5. Remote Control Wiring  
Pin 1 is for 10 VDC reference voltage output.  
Pin 2 (C) has two functions:  
Volume control: it can be used as a variable voltage input between 0 and 10 VDC,  
with 0 V giving full attenuation and 10 V giving maximum volume.  
Mute: it can be used for remote control muting. Sound is muted while this pin is  
shorted to ground.  
Pin 3 is for the ground connection.  
NOTE: All nominal levels are at 10%.  
Controlling multiple amplifiers with one volume controller  
Several MPA 152 Plus units can be daisy‑chained so that one volume controller can  
simultaneously regulate the volume of all the amplifiers.  
NOTES:  
As additional amplifiers are added to the daisy chain, the sensitivity of the  
volume potentiometer changes. The maximum volume level (fully clockwise)  
is not affected. However the effectiveness of the minimum volume level (fully  
counterclockwise) in reducing the volume to inaudible levels decreases as  
more amplifiers are added to the daisy chain.  
When more than two amplifiers are attached to the chain, sound may begin  
to be heard even if the levels have been set to their lowest. The muting of  
the output however can be remedied with a contact closure button attached  
between the C (volume or mute) and G (ground) pins of the first amplifier in the  
chain.  
MPA 152 Plus • Panels and Cabling  
7
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To regulate multiple amplifiers with a single volume controller, follow these instructions:  
1. Attach all three pins of the volume controller to the corresponding pins on the first  
MPA 152 Plus unit only:  
Ground ( ) to ground (G)  
Vol/Mute to C  
10 V to V.  
2. Use jumper wires to connect the C (Volume and Mute) pins of the first amplifier and  
each successive amplifier.  
3. Use jumper wires to connect the ground pins of the first amplifier and each successive  
amplifier.  
VOL/MUTE  
10V  
Extron  
VCM 100 AAP  
Extron  
MPA 152 Plus  
Daisy Chain  
V
10V  
C
G
50mA  
V
10V  
C
G
50mA  
V
10V  
C
G
50mA  
Figure 6. Regulating Multiple Amplifiers with a Single Volume Controller  
NOTE: The 10V pin of the volume controller connects to the first MPA 152 Plus  
only. There are no jumper wires linking it to subsequent amplifiers.  
MPA 152 Plus • Panels and Cabling  
8
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Audio Output  
Speaker receptacle — This 4‑pole, 5 mm screw lock  
captive screw receptacle is used to connect the amplifier  
to the speakers.  
f
8
Ω /  
4Ω  
CLASS 2  
WIRING  
With an 8 ohm load, the amplifier produces up to 8 watts  
per channel. With a 4 ohm load, the amplifier produces up  
to 15 watts per channel.  
R
L
See the attention (page 5) and note (page 5) for important information about  
connecting wires to captive screw connectors.  
ATTENTION: Do not short the + and – outputs to each other, as this will damage  
the amplifier.  
-
+
Captive  
+
+
Screw  
RCA  
TRS  
Stereo  
+
+
Left  
+
+
Dual  
Mono  
-
+
Captive  
Screw  
+
+
+
+
Stereo  
RCA  
TRS  
Right  
Amp Stage  
Stereo/Dual Mono Switch  
Figure 7. MPA 152 Plus Summing Diagram  
Signal flow is as follows:  
1. The MPA 152 Plus sums and weights the left unbalanced signals from the TRS and  
RCA receptacles. This summed, unbalanced signal is then summed with the left  
balanced signal from the captive screw receptacle.  
2. The right channel is handled in the same way.  
3. The left and right channels are then sent to the output amplifiers in one of two ways,  
depending on how the front panel switch is set.  
Stereo: The left and right channels are sent to the left and right output amplifers  
respectively.  
Dual Mono: The left and right channels are summed and then the resulting mono is  
fed to both of the output amplifiers.  
The captive screw, RCA, and TRS inputs are buffered.  
MPA 152 Plus • Panels and Cabling  
9
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Setup and  
Operation  
This section discusses:  
Front Panel Features and Operation  
This section describes how configure the MPA 152 Plus, using the front panel controls and  
how to set up the remote control options.  
LEVEL  
BASS  
TREBLE  
STEREO  
1
DUAL  
MONO  
MPA 152 Plus  
MINI POWER AMPLIFIER  
2
3
Figure 8. MPA 152 Plus Front Panel  
Power LED — The LED lights green when the MPA 152 Plus unit is receiving power  
and active. It lights amber when the unit is powered down (after 25 minutes of inactivity).  
a
Stereo or Dual Mono toggle switch — Allows the user to choose between stereo  
output for stereo applications (default) or dual mono output for mono applications.  
b
Level, Bass, and Treble potentiometers — Three front panel potentiometers are  
used to optimize input level, bass, and treble settings.  
c
Setting Input Level  
Adjust the MPA 152 Plus input level as follows:  
1. Unplug the Remote plug from the unit.  
2. Set the volume of the audio source to its minimum level.  
3. Turn the Level potentiometer fully counterclockwise to its minimum setting.  
4. Set the volume of the audio source to its maximum level. No sound should come out.  
5. Slowly increase the MPA 152 Plus level by rotating the Level potentiometer clockwise  
until sound distortion starts. Lower the level slightly until the distortion disappears. At  
this setting, whatever the volume setting of the audio source, no clipping will occur.  
MPA 152 Plus • Setup and Operation  
10  
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Setting Bass and Treble  
Adjust the MPA 152 Plus bass and treble as follows:  
1. Use the Bass potentiometer to increase or decrease the bass shelving 10 dB at 80 Hz  
and below.  
2. Use the Treble potentiometer to increase or decrease the treble shelving 10 dB at  
10 kHz and above.  
NOTE: Turning the Bass or Treble potentiometers counterclockwise will decrease the  
output at the specified frequencies. Turning the potentiometers clockwise will increase  
the output. When the potentiometer is in the center, flat response is achieved.  
Remote Control Options  
8 ohm Ceiling  
Speakers  
in Parallel  
PC  
DVD  
S-video  
Audio RCA  
VGA w/  
Audio Cable  
OUPT  
4Ω  
R
C
REMOT  
/
8Ω  
2
S
S
L
A
C
L
N
G
RI  
I
W
E
G
0m  
A
5
VV  
10  
s
S
UT  
R
Plu  
P
IN  
2
R
R
5
1
A
L
MP  
WE  
O
P
Extron  
X
A
V
12  
M
A
7
0.  
L
VCR  
Composite  
Audio RCA  
MPA 152 Plus  
Mini Power Amplifier  
Variable  
Audio  
Output  
PROJ
O
F
F
ON  
E
ComLink  
UM  
L
VO  
IG  
CONF  
P
I
4
0
1
C
ML  
E
T
U
M
A
P
A
M
C
0
10  
L
O
V
V
2
Extron  
MLC 104 IP  
Controller  
3
Extron  
VCM 100 AAP  
Volume/Mute Controller  
Projector  
1
IR Remote  
Figure 9. Typical Application for the MPA 152 Plus, Using Remote Control  
Using the IR remote for the projector — When using a projector with variable audio  
a
outputs, connect the projector audio output to the MPA 152 Plus audio input. Use  
the IR remote for the projector to control the volume of the projector, which effectively  
controls the volume of the MPA 152 Plus.  
Extron volume controllers — Extron provides a range of volume and mute controllers  
for use with a projector that lacks variable audio outputs. These options control the  
b
MPA 152 Plus volume directly (see Wiring for remote control on page 7).  
Using a MediaLink Controller — For a projector with variable audio output, connect  
c
the projector audio output to the MPA 152 Plus audio input. Use a MediaLink controller  
to adjust the volume of the projector via RS‑232. MediaLink controllers can also use the  
IR remote to adjust the volume of the projector and, thus, the input to the amplifier.  
MPA 152 Plus • Setup and Operation  
11  
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Defeating the Auto Power-down Timer  
The auto power‑down timer determines whether or not the amplifier enters standby mode.  
The amplifier powers down if the input signal remains below the input signal detection  
threshold for about 25 minutes.  
The timer resets whenever the input signal exceeds the input signal detection threshold.  
Resetting the timer starts a new 25 minute countdown until the amplifier powers down.  
Resetting the timer also causes an amplifier that is already powered down to “wake up.”  
There may be times when it is desirable to bypass the auto power‑down timer. However,  
this should be done as a last resort. Examples of when defeating the auto power‑down  
circuit might be required include:  
If the amplifier is used in a paging system. When the amplifier has already powered  
down, the first syllable might be cut off as the amplifier wakes up from standby mode.  
If the input signal is so quiet that the level remains below the input signal detection  
threshold for 25 minutes, the timer would cut the audio in the middle of playback by  
placing the amplifier into standby mode.  
ATTENTION: The following procedure cannot be reversed and should be carried out  
as a last resort. Be certain that you need to defeat the auto power‑down timer before  
continuing.  
To defeat the auto power‑down timer, follow these  
instructions:  
1. Disconnect power from the amplifier.  
OPUT  
2. Remove the four screws that secure the top  
enclosure to the bottom enclosure (there are two  
screws on each side panel).  
4Ω  
2
G
REMO  
R
C
/
8Ω  
SS  
L
A
L
C
TE  
WIRIN  
G
A
m
0
5
VV  
0
s
S
lu  
T
1
P
PU  
R
N
I
152  
R
A
L
MP  
ATTENTION: Exercise caution when removing  
OWE  
R
P
V
AX  
2
M
1
A
7
.
0
L
the screws to avoid stripping the head.  
3. Slide the top enclosure forward to clear the switch  
and potentiometers on the front panel, then lift it  
straight up to separate it from the bottom enclosure.  
Four screws (two on each side)  
secure the top enclosure to the bottom.  
The circuit boards are now exposed at the front.  
ATTENTION: Do not touch the electronic components or circuit board connectors  
without being electrically grounded. Handle circuit boards by their edges only.  
ESD can damage circuits, even if you cannot feel, see, or hear it.  
MPA 152 Plus • Setup and Operation  
12  
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Stereo to Dual Mono  
Toggle Switch  
Level Potentiometer  
Resistor R42  
Figure 10. Front View, Showing the Location of Resistor R42  
4. Identify resistor R42 at the front of the bottom circuit board between the Stereo to Dual  
Mono toggle switch (to the left) and the Level potentiometer (to the right). The resistor is  
shown in the white box in figure 10.  
5. Remove the resistor using a pair of diagonal cutters to clip the wires attaching it to the  
circuit board.  
6. Re‑attach the top enclosure with the four screws removed in step 1.  
Troubleshooting  
Under different circumstances, the front panel LED lights green or amber to provide  
diagnostic information.  
Amplifier Fails to Exit Standby Mode Promptly  
Power LED Problem Description  
Problem Solution  
Color  
Amber  
No output signal.  
No output signal.  
No input detected: verify that there is an  
input signal.  
If a signal is present, raise the level of the  
source signal.  
Green  
The amplifier may be in mute mode. Check  
the Remote port.  
Green or  
Amber  
Slow to exit standby mode The input signal may be too weak. Raise the  
when a signal is present.  
level of the source signal.  
Amplifier Enters Standby Mode Too Early  
Power LED Problem Description  
Color  
Problem Solution  
Green or  
Amber  
Enters standby mode  
early.  
The input signal may be too weak. Raise the  
level of the source signal.  
MPA 152 Plus • Setup and Operation  
13  
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Mounting  
This section provides information about the mounting options for the MPA 152 Plus.  
Rack Mounting  
UL Guidelines for Rack Mounting  
The following Underwriters Laboratories (UL) guidelines are relevant to the safe  
installation of this product in a rack:  
1. Elevated operating ambient temperature — If the unit is installed in a closed  
or multi‑unit rack assembly, the operating ambient temperature of the rack  
environment may be greater than room ambient temperature. Therefore, install the  
equipment in an environment compatible with the maximum ambient temperature  
(TMA: +122 °F, +50 °C) specified by Extron.  
2. Reduced air flow — Install the equipment in the rack so that the equipment gets  
adequate air flow for safe operation.  
3. Mechanical loading — Mount the equipment in the rack so that uneven  
mechanical loading does not create a hazardous condition.  
4. Circuit overloading — Connect the equipment to the supply circuit and consider  
the effect that circuit overloading might have on overcurrent protection and supply  
wiring. Appropriate consideration of the equipment nameplate ratings should be  
used when addressing this concern.  
5. Reliable earthing (grounding) — Maintain reliable grounding of rack‑mounted  
equipment. Pay particular attention to supply connections other than direct  
connections to the branch circuit (such as the use of power strips).  
MPA 152 Plus • Mounting  
14  
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Rack Mounting Procedure  
The unit can be mounted on a compatible rack system (optional). Follow the instructions  
provided with the shelf accessories.  
ATTENTION: Use only the two holes indicated in the diagram below for mounting  
the MPA 152 Plus. The other four holes anchor stand‑offs for the internal circuit  
boards; using them may damage the amplifier and will not provide secure  
mounting for the unit.  
1.44"  
Hole for Rack  
Mounting Screw  
(#4-40 Thread)  
3.67"  
Hole for Rack  
Mounting Screw  
(#4-40 Thread)  
Figure 11. Base of MPA 152 Plus to Show Mounting Holes  
Back of the Rack Mounting  
Mount the unit at the back of a rack rail, following the instructions provided with the kit.  
Other Mounting Options  
Tabletop placement — Place the unit in any convenient location.  
Plenum placement — The MPA 152 Plus amplifier complies with Section 300.22 (c) of  
the National Electrical Code and is suitable for use in an Environmental Air Space. It can  
be installed in the ceiling, out of sight, with reduced risk of theft.  
ATTENTION: Although the amplifier is plenum rated, the power supply provided  
with it is not. The power supply must not be placed in the plenum space. Cables  
to and from the amplifier must also be plenum rated. The DC power cord  
provided with the unit is not plenum rated.  
Under-desk mounting — Mount the unit under a desk or podium, following the  
instructions provided with the kit.  
Pole mounting — Mount the unit above a projector using a Pole Mounting Kit. Follow  
the instructions provided with the kit.  
ZipClip 200 mounting — Mount the unit under furniture or to a rack rail using the  
ZipClip 200. Follow the instructions provided with the mounting kit.  
MPA 152 Plus • Mounting  
15  
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Extron Warranty  
Extron Electronics warrants this product against defects in materials and workmanship for a period of three years  
from the date of purchase. In the event of malfunction during the warranty period attributable directly to faulty  
workmanship and/or materials, Extron Electronics will, at its option, repair or replace said products or components,  
to whatever extent it shall deem necessary to restore said product to proper operating condition, provided that it is  
returned within the warranty period, with proof of purchase and description of malfunction to:  
USA, Canada, South America,  
and Central America:  
Extron Electronics  
1230 South Lewis Street  
Anaheim, CA 92805  
U.S.A.  
Japan:  
Extron Electronics, Japan  
Kyodo Building, 16 Ichibancho  
Chiyoda-ku, Tokyo 102-0082  
Japan  
Europe and Africa:  
Extron Europe  
Hanzeboulevard 10  
3825 PH Amersfoort  
The Netherlands  
China:  
Extron China  
686 Ronghua Road  
Songjiang District  
Shanghai 201611  
China  
Asia:  
Middle East:  
Extron Electronics Asia Pte. Ltd.  
135 Joo Seng Road, #04-01  
PM Industrial Bldg.  
Singapore 368363  
Singapore  
Extron Middle East  
Dubai Airport Free Zone  
F12, PO Box 293666  
United Arab Emirates, Dubai  
This Limited Warranty does not apply if the fault has been caused by misuse, improper handling care, electrical  
or mechanical abuse, abnormal operating conditions, or if modifications were made to the product that were not  
authorized by Extron.  
NOTE: If a product is defective, please call Extron and ask for an Application Engineer to receive an RA (Return  
Authorization) number. This will begin the repair process.  
USA:  
Asia:  
714.491.1500 or 800.633.9876  
65.6383.4400  
Europe: 31.33.453.4040  
Japan: 81.3.3511.7655  
Units must be returned insured, with shipping charges prepaid. If not insured, you assume the risk of loss or damage  
during shipment. Returned units must include the serial number and a description of the problem, as well as the  
name of the person to contact in case there are any questions.  
Extron Electronics makes no further warranties either expressed or implied with respect to the product and its quality,  
performance, merchantability, or fitness for any particular use. In no event will Extron Electronics be liable for direct,  
indirect, or consequential damages resulting from any defect in this product even if Extron Electronics has been  
advised of such damage.  
Please note that laws vary from state to state and country to country, and that some provisions of this warranty may  
not apply to you.  
Extron Asia  
Extron India  
Extron Headquarters  
Extron Europe  
Extron Japan  
Extron China  
Extron Middle East  
Extron Korea  
+65.6383.4400  
+65.6383.4664 FAX  
1800.3070.3777  
(Inside India Only)  
+1.800.633.9876 (Inside USA/Canada Only)  
+800.3987.6673  
(Inside Europe Only)  
+81.3.3511.7655  
+81.3.3511.7656 FAX  
+86.21.3760.1568  
+86.21.3760.1566 FAX  
+971.4.299.1800  
+971.4.299.1880 FAX  
+82.2.3444.1571  
+82.2.3444.1575 FAX  
Extron USA - West  
+1.714.491.1500  
Extron USA - East  
+1.919.850.1000  
+91.80.3055.3777  
+31.33.453.4040  
+91.80.3055.3737 FAX  
+1.714.491.1517 FAX  
+1.919.850.1001 FAX  
+31.33.453.4050 FAX  
© 2013 Extron Electronics All rights reserved. www.extron.com  
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