User’s Manual
MPA 152
Mini Power Amplifier
68-1320-01
Rev. A
02 09
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警告
安全须知 • 中文
这个符号提示用户该设备用户手册中
电源 • 该设备只能使用产品上标明的电源。 设备
必须使用有地线的供电系统供电。 第三条线
（地线）是安全设施，不能不用或跳过。
拔掉电源 • 为安全地从设备拔掉电源，请拔掉所有设备后
或桌面电源的电源线，或任何接到市电系统的电源线。
电源线保护 • 妥善布线， 避免被踩踏，或重物挤压。
有重要的操作和维护说明。
这个符号警告用户该设备机壳内有暴
露的危险电压，有触电危险。
维护 • 所有维修必须由认证的维修人员进行。 设备内部
没有用户可以更换的零件。为避免出现触电危险不要自
己试图打开设备盖子维修该设备。
注意
阅读说明书 • 用户使用该设备前必须阅读并理
解所有安全和使用说明。
保存说明书 • 用户应保存安全说明书以备将来使
用。
通风孔 • 有些设备机壳上有通风槽或孔，它们是用来防止
机内敏感元件过热。 不要用任何东西挡住通风孔。
锂电池 • 不正确的更换电池会有爆炸的危险。 必须使用
与厂家推荐的相同或相近型号的电池。 按照生产厂的
建议处理废弃电池。
遵守警告 • 用户应遵守产品和用户指南上的所有安
全和操作说明。
避免追加 • 不要使用该产品厂商没有推荐的工具或
追加设备，以避免危险。
声明
所使用电源为 A 级产品，在生活环境中，该产品可能会造成无线电干扰。在这种情况下，可能需要用
户对其干扰采取切实可行的措施。
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 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
the 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 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.
This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used
with the unit to ensure compliance.
N
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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 manufacturer's instructions.
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 your safety. If the provided
plug does not fit into your 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/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 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.
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Quick Start Guide — MPA 152 Amplifier
To install and set up an MPA 152 Mini Power Amplifier, follow these
steps:
Step 1
Turn all of the equipment off and disconnect it from power sources.
Step 2
Mount the MPA 152 on a rack, under a desk, or on a projector, as
illustrated below.
Extron PMK 300
Projector Mounting
Bracket
Extron
MPA 152
Mini Power
Amplifier
Extron
Power Supply
Plastic Tie
Under Desk
Projector Mount
DIS
TRIB
UTIO
N
AMP
LIF
IER
DIS
TRIB
UTIO
3.5" Rack Shelf
N
AMP
LIF
IER
1/4 Rack Width False Front
Face Plate
DISTRI
BUTION
A
MPLI
FIER
Use 2 mounting holes on
opposite corners.
(2) 4-40 x 3/16" screws
Rack Mount
Step 3
Attach the speakers to the MPA 152.
Step 4
Attach inputs to the MPA 152 unit from the audio source and/or
projector. Ensure that the projector’s audio output is set to variable
out. Multiple input options can be used simultaneously and result in
audio mixing (see "Audio Inputs" in Chapter 2 for more information).
MPA 152 Amplifier • Quick Start Guide
QS-i
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Quick Start Guide — MPA 152 Amplifier, cont’d
The MPA 152 amplifier mixes all right channel inputs to a
single signal and all left channel inputs to a second signal.
The user may output these signals as stereo or sum them to
produce a dual mono signal.
N
Step 5
Connect power cords to MPA 152 and other audio equipment.
Step 6
Adjust the MPA 152 Plus input level, bass and treble.
LEVEL
BASS
TREBLE
a.
If connecting the amplifier to a
projector, set the projector volume
to its lowest point. Then adjust the
MPA 152 level potentiometer fully
counter clockwise.
MPA 152
MINI POWER AMPLIFIER
b.
c.
Set the projector volume to its maximum volume level (no
sound should come out).
Return to the MPA 152 and raise the level until sound
distortion first occurs, then lower slightly until the
distortion disappears. This setting ensures that, whatever
the projector volume setting may be, no clipping occurs.
d.
Adjust bass and treble to preference.
8 ohm Ceiling
Speakers
in Parallel
PC
DVD
S-video
Audio RCA
VGA w/
Audio Cable
S
OUTPUT
L
R
E
T
O
8
4/
s
REM
A
122 PLUS
INPUTS
Ohm
MP
T
O
S
V
10
V
L/MUTE
O
LISTED 17T
R
TU
ARA
UDIO/VIDE
US APP
A
L
C
R
WE
R
PO
Extron
L
VCR
X
12V
3A MA
MPA 152
Mini Power Amplifier
Composite
Audio RCA
Variable
Audio
Output
1
2
R
O
T
OJEC
PR
OFF
3
4
ON
ComLink
LUME
O
V
G
CONFI
MLC 104 IP
MUTE
LUME
VCM 100 AAP
O
V
Extron
MLC 104 IP
Controller
Extron
VCM 100 AAP
Volume/Mute Controller
Projector
IR Remote
MPA 152 Amplifier • Quick Start Guide
QS-ii
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Table of Contents
Chapter One • Introduction.................................................... 1-1
About this Manual .................................................................... 1-2
About the MPA 152................................................................... 1-2
MPA 152 Features...................................................................... 1-3
Chapter Two • Installation ..................................................... 2-1
Mounting the MPA 152............................................................ 2-2
Rack mounting....................................................................... 2-2
UL guidelines for rack mounting...........................................2-2
Rack mounting procedures....................................................2-3
Tabletop placement ............................................................... 2-3
Projector mounting................................................................ 2-4
Plenum placement ................................................................. 2-5
Under-furniture mounting .................................................... 2-6
MPA 152 Front Panel Features............................................... 2-8
MPA 152 Rear Panel Features................................................ 2-9
Power connector.................................................................. 2-10
Audio inputs......................................................................... 2-11
Remote control..................................................................... 2-12
Wiring for remote control....................................................2-12
Controlling multiple amplifiers with
one volume controller..........................................................2-13
Audio output........................................................................ 2-14
Chapter Three • Operation ..................................................... 3-1
Setting Up the MPA 152 Amplifier....................................... 3-2
Setting input level ................................................................. 3-2
Setting bass and treble.......................................................... 3-2
Remote Control Options ......................................................... 3-3
Appendix A • Reference Information ............................A-1
Specifications..............................................................................A-2
Included Parts .............................................................................A-4
Accessories...................................................................................A-5
All trademarks mentioned in this manual are the properties of their respective owners.
68-1320-01
Rev. A
02 09
MPA 152 Amplifier • Table of Contents
i
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Table of Contents, cont’d
MPA 152 Amplifier • Table of Contents
ii
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MPA 152 Amplifier
Chapter One
1
Introduction
About this Manual
About the MPA 152
MPA 152 Features
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Introduction
About this Manual
This manual contains information about the Extron
MPA 152 Mini Power Amplifier, with instructions on how to
mount, install, and operate the unit.
About the MPA 152
The Extron MPA 152 is a high performance, compact, power
amplifier.
The amplifier delivers up to 15 watts (rms)/channel stereo or
dual mono into a 4 ohm sound system, or 8 watts (rms)/channel
into an 8 ohm system.
Front panel controls allow easy adjustment of bass and treble
volume and input level.
The unit meets UL smoke and fire code for in-the-ceiling
installations and can be stored in the plenum space of the roof.
Alternatively, the units can be mounted on a tabletop, in a rack,
under a desk, or in a projector mounting kit.
8 ohm Ceiling
Speakers
in Parallel
PC
DVD
S-video
Audio RCA
VGA w/
Audio Cable
S
OUTPUT
L
R
E
T
O
8
4/
s
REM
A
122 PLUS
INPUTS
Ohm
MP
V
TT
10
V
O
L/MUTE
O
S
LISTED 17
TU
R
UDIO/VIDE
A
ARA
U
S
A
P
P
L
C
R
WE
R
PO
Extron
L
VCR
X
12V
3A MA
MPA 152
Mini Power Amplifier
Composite
Audio RCA
Variable
Audio
Output
1
2
R
O
T
OJEC
PR
OFF
3
4
ON
ComLink
LUME
O
V
G
CONFI
MLC 104 IP
MUTE
LUME
VCM 100 AAP
O
V
Extron
MLC 104 IP
Controller
Extron
VCM 100 AAP
Volume/Mute Controller
Projector
IR Remote
MPA 152 Amplifier • Introduction
1-2
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MPA 152 Features
Class D digital audio amplifier — For high efficiency and less
heat production.
Ripple Steering technology — Produces cleaner, low-emission,
audio output signals.
Fixed switching frequency — Switches at a frequency below the
AM band, which reduces the chance of radio interference.
Three audio inputs — Accepts 1 balanced/unbalanced input
pair (captive screw) and 2 unbalanced pairs (RCA and
TRS), providing up to three right and three left channel
inputs. All three right inputs are mixed to produce a
single right output; all three left outputs are mixed to
produce a single left output.
Stereo/Dual Mono toggle switch — Allows the user to choose
between stereo output or to sum the left and right outputs
and produce dual mono outputs.
Up to 15 watts (rms)/channel stereo output — Delivers up to
15 watts (rms)/channel, stereo or dual mono, into a 4 ohm
speaker system or up to 8 watts (rms)/channel into an
8 ohm system.
Front panel controls — Input level, bass and treble are easily
adjusted from the front panel.
Quick-plug speaker outputs — Speaker output is on a 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, quarter
rack 3" deep, metal enclosure, which offers flexible
mounting options.
UL 2043 plenum rated — The MPA 152 meets UL 2043
requirements for heat and smoke release and is suitable
for in-the-ceiling installations, allowing the unit to be
stored out of sight, with reduced risk of theft.
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. All cables
connected to the amplifier must be plenum rated.
C
MPA 152 Amplifier • Introduction
1-3
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Introduction, cont’d
MPA 152 Amplifier • Introduction
1-4
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MPA 152 Amplifier
Chapter Two
2
Installation
Mounting the MPA 152
MPA 152 Front Panel Features
MPA 152 Rear Panel Features
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Installation
Mounting the MPA 152
The MPA 152 amplifier meets UL 2043 requirements for heat
and smoke release and is suitable for in-the-ceiling installations,
allowing the unit to be stored out of sight with reduced risk of
theft. Alternatively, the 1 U, quarter rack size of these amplifiers
allows them to be mounted in a variety of convenient locations:
•
•
•
•
Rack
Tabletop
Projector
Under furniture
Rack mounting
UL guidelines for rack mounting
The following Underwriters Laboratories (UL) guidelines are
relevant to the safe installation of the MPA 152 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.
3.
4.
Reduced air flow — Install the equipment in the rack
so that the equipment gets adequate air flow for safe
operation.
Mechanical loading — Mount the equipment in the rack
so that uneven mechanical loading does not create a
hazardous condition.
Circuit overloading — Connect the equipment to
the supply circuit and consider the effect that circuit
overloading might have on overcurrent protection and
supply wiring. Give appropriate consideration to the
equipment nameplate ratings.
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 power strips).
MPA 152 Amplifier • Installation
2-2
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Rack mounting procedures
The unit can be mounted in the front or rear of any of these rack
systems:
•
•
•
•
RSU 126 — 6" deep 1U rack shelf kit (PN 60-190-10)
RSB 126 — 6" deep 1U basic rack shelf (PN 60-604-11)
RSU 129 — 9.5" deep 1U rack shelf kit (PN 60-190-01)
RSB 129 — 9.5" deep 1U basic rack shelf (PN 60-604-02)
To rack mount the MPA 152, follow these directions:
1. If necessary, remove rubber feet from the bottom of the unit.
2. Secure the MPA 152 to the shelf with two 4-40 x 3/16"
screws in opposite corners of the base (see figure 2-1 below).
3. Install false faceplate(s) or other unit(s) to the rack shelf.
4. Attach the shelf to the rack with the four provided
10-32 x 3/4" bolts.
1U Universal Rack Shelf
1/2 Rack Width Front False
Faceplate
1/4 Rack Width Front False
Faceplate
Both front false faceplates
use 2 screws.
(2) 4-40 x 3/16"
Screws
Use 2 mounting holes on
opposite corners.
Figure 2-1 — Rack mounting
Tabletop placement
Attach the four provided rubber feet to the bottom of the unit
and place it in any convenient location.
MPA 152 Amplifier • Installation
2-3
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Installation, cont’d
Projector mounting
The instructions for mounting the amplifier near the projector,
using the PMK 300 projector mounting kit (PN 70-374-01), are
shown below. For instructions on using other Extron projector
mounting kits, consult the user guide for that kit.
1.
If necessary, remove the rubber feet from the bottom of the
MPA 152.
2.
Mount the receiver to any of the bracket's three mounting
plates. The unit should be vertically mounted with the
rear panel, housing the input and output connectors,
facing downwards.
Backing
Brace
Rubber Pad
U-Bolt
Clamping
Plate
Extron
PMK 300
Multi Product
Projector
Mount Kit
Figure 2-2 — Projector mounting
On the side mounting plates, the device is typically
mounted on the outside of the bracket. On the front
mounting plate, the device is mounted on the inside of
the bracket.
N
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2-4
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a. Use the two 4-40 x 3/16" screws (provided) to secure
the amplifier to the bracket
b. If required, secure the power supply using the plastic
ties provided with the kit.
The projector pole can be clamped to the back surface of
the clamping plate on the PMK 300, as shown in the
figure on the previous page.
N
Alternatively, the PMK 300 has a hole in the bottom
plate that allows the projector pole to be inserted through
the center of the plate. In this configuration, slide the
PMK 300 up from the bottom of the pole before the
projector is installed.
3.
4.
Attach the rubber pad to the surface of the clamping plate
that will be in contact with the pole.
Place the U-bolt around the projector pole and insert the
two ends through the slotted holes in the clamping plate
and then through the round holes in the backing brace.
The provided U-bolt fits a pole with an external diameter
of 1.5" to 2.0". For larger or smaller diameter poles,
obtain a U-bolt from a local hardware store. The slotted
holes in the clamping plate can accommodate U-bolts
that are 1.0" to 2.5" in width.
N
5.
Secure the bracket to the projector pole with the U-bolt and
the provided hex nuts and washers. Use an appropriately-
sized socket wrench to tighten the hex nuts.
Plenum placement
The MPA 152 meets UL 2043 requirements for heat and smoke
release and can be installed in the ceiling plenum space.
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. All cables
connected to the amplifier must be plenum rated.
C
MPA 152 Amplifier • Installation
2-5
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Installation, cont’d
Under-furniture mounting
The MPA 152 amplifer can be mounted under furniture using
the optional MBU 123 mounting kit (PN 70-212-01):
1.
Attach the mounting brackets to the MPA 152 with the
provided machine screws as shown in the figure below.
2.
Hold the amplifier with the attached brackets against the
underside of the table or other furniture. Mark the location
of the screw holes of the bracket on the mounting surface.
3.
4.
Drill 3/32" (2 mm) diameter pilot holes, 1/4" (6.3 mm)
deep in the mounting surface at the marked locations.
Insert #8 wood screws into the four pilot holes. Tighten
each screw into the mounting surface until just less than
1/4" of the screw head protrudes.
5.
Align the amplifier so that the screw heads pass through
the slots in the brackets and the unit is resting firmly
against the bottom surface of the furniture.
Figure 2-3 — Under furniture mounting
6.
Slide the unit slightly forward or back. Tighten all four
screws to secure it in place.
MPA 152 Amplifier • Installation
2-6
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MPA 152 Amplifier • Installation
2-7
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Installation, cont’d
MPA 152 Front Panel Features
The illustration below shows the front panel of the
MPA 152.
LEVEL
BASS
TREBLE
STEREO
1
DUAL
MONO
MPA 152
MINI POWER AMPLIFIER
2
3
Figure 2-4 — MPA 152 Front Panel Features
Power LED — The green LED is lit when the unit receives
power.
a
b
Stereo/Dual Mono toggle switch — Allows the user to choose
between stereo output for stereo program speakers or dual
mono output for mono ceiling speakers
Potentiometers — Three front panel potentiometers are used to
optimize level, bass, and treble settings.
c
MPA 152 Amplifier • Installation
2-8
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MPA 152 Rear Panel Features
The illustration below shows the rear panel of the MPA 152.
OUTPUT
MPA 152
CLASS 2 WIRING
C
US
DO NOT GROUND
LISTED
17TT
4/8
OR SHORT
OHMS
SPEAKER OUTPUTS!
AUDIO/VIDEO
APPARATUS
R
L
INPUTS
POWER
REMOTE
L
R
R
L
12V
3A MAX
VOL/MUTE
50mA
10V
4
5
6
7
8
9
Figure 2-5 — MPA 152 Rear Panel Features
Power connector — Connect the 12 V external power supply to
the amplifier using the 2-pole captive screw connector
d
e
f
g
RCA input connectors — These female RCA connectors accept
line level, mono or stereo, audio sources.
3.5 mm stereo input — This input accepts a 3.5 mm
tip-ring-sleeve (TRS) stereo jack.
Balanced or unbalanced audio input connector — Connect
balanced or unbalanced, mono or stereo, audio to this 5-pole,
3.5 mm captive screw connector.
Remote input connector — This 3-pole 3.5 mm captive screw
connector allows remote control of volume or muting of audio.
h
i
Speaker connector — Connect the speakers to this socket using
quick-plug 4-pole, 5 mm captive screw connector.
MPA 152 Amplifier • Installation
2-9
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Installation, cont’d
Power connector
Connect the two pole, 3.5 mm captive screw connector from
the power supply (provided) to this socket on the rear panel.
Ensure the connections have the correct polarity as shown in the
illustration below:
Smooth
Ridges
POWER
A
A
Power Receptacle
SECTION A–A
12V
3A MAX
Power Supply
Output Cord
DC Power Cord
Captive Screw Connector
Ground
+12 VDC
External
Power Supply
(12 VDC, 3 A )
AC Power Cord
Figure 2-6 — Connecting power
The length of the exposed wires in the stripping process
is critical. The ideal length is 3/16” (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.
N
Do not tin the wires. Tinned wire does not hold its
shape and can become loose over time.
C
MPA 152 Amplifier • Installation
2-10
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Audio inputs
INPUTS
L
R
R
L
Figure 2-7 — Audio inputs
RCA connectors — Two connectors
(left and right) accept
Tip (+)
unbalanced, line level audio
signals. The input can be
stereo (using two RCA jacks)
or mono (using a single RCA
jack plugged into the left/
mono socket). If unused,
the connectors automatically
terminate to lower the noise
floor.
Sleeve (
)
RCA Connector
Tip (L)
Ring (R)
Sleeve (
)
3.5 mm TRS connector — This
connector accepts unbalanced,
line level audio signals. If
unused, the connector
3.5 mm Stereo
Plug Connector
Tip
automatically terminates to
lower the noise floor.
Ring
Sleeves
Tip
Ring
Captive Screw connector — This
5-pole, 3.5 mm captive screw
input accepts balanced or
Balanced audio
Tip
Sleeve
Tip
Sleeve
unbalanced, mono or stereo, line
level signals.
Unbalanced audio
The length of the exposed wires in the stripping process
is critical. The ideal length is 3/16” (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.
N
Do not tin the wires. Tinned wire does not hold its
shape and can become loose over time.
C
The three left channel inputs (RCA, TRS and captive screw) and
three right channels are mixed to provide a single left channel
output. The three right channel inputs are mixed to provide a
single right channel output.
Depending on the position of the front panel toggle switch,
the right and left channels may be output as a stereo signal, or
summed and output as a dual mono signal.
MPA 152 Amplifier • Installation
2-11
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Installation, cont’d
Remote control
Wiring for remote control
This 3-pin, captive screw connector allows a
wall-mounted audio controller or MediaLink
product to control volume and mute levels
remotely.
REMOTE
VOL/MUTE
50mA
10V
Options for remote control include Extron's VC 50
(PN 70-530-02), VCM 100 AAP (PN 70-396-x1), VCM 100 MAAP
(PN 70-397-x1) and MLA VC10 (PN 60-502-01).
Third party 10k potentiometer volume controllers can also be
connected to this port.
The length of the exposed wires in the stripping process
is critical. The ideal length is 3/16” (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.
N
Do not tin the wires. Tinned wire does not hold its
shape and can become loose over time.
C
Wire the the remote control connector to the VCM 100 MAAP as
shown in the figure and instructions below:
REMOTE
10 V (Pin 1)
2K
Vol/Mute
(Pin 2)
Volume Pot
10K Ohms
Mute
Switch
GND (Pin 3)
Figure 2-8 — Wiring diagram for remote control
•
•
Pin 1 is 10 V DC reference voltage.
Pin 2 (VOL/MUTE) has two functions:
a. It can be used as a variable voltage input. The volume
control range DC voltage range is 0 to 10 V, with 0
V giving full attenuation and 10 V giving maximum
volume.
b. It can be used for remote control muting. Sound is
muted while the mute pin is shorted to ground.
•
Pin 3 is ground.
All nominal levels are at 10%
N
MPA 152 Amplifier • Installation
2-12
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Controlling multiple amplifiers with one volume controller
Several MPA 152 units can be daisy-chained so that one volume
controller can simultaneously regulate the volume of all the
amplifiers.
As additional amplifiers are added to the daisy chain,
the sensitivity of the volume potentiometer will change.
The maximum volume level (fully clockwise) will not
be 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.
N
When more than two MPAs 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 Vol/Mute and Ground pin of the first MPA
in the chain.
N
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 unit only (ground
to ground; Mute/Vol to Mute/Vol; and 10 V to 10 V).
2. Use jumper wires to connect the Vol/Mute pins of the first
and each successive amplifier.
3. Use jumper wires to connect the ground pins of the first and
each successive amplifier.
VOL/MUTE
Extron
VCM 100 AAP
10V
Extron
MPA 152
daisy chain
VOL/MUTE
10V 50mA
VOL/MUTE
10V 50mA
VOL/MUTE
10V 50mA
Figure 2-9 — Controlling multiple amplifiers with
one volume controller
MPA 152 Amplifier • Installation
2-13
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Installation, cont’d
Audio output
This 4-pole, 5 mm captive screw connector
OUTPUT
is used to connect the amplifier to the
speakers.
4/8
OHMS
All right channel input signals are mixed
and summed to produce a single, right
R
L
channel output; likewise, all left channel input signals are mixed
and summed to produce a single, left channel output
If the front panel switch is set to stereo, the output will be
stereo; if the front panel switch is set to mono, the right and left
channels will be mixed and summed for a dual mono output.
With an 8 ohm load, the amplifier produces up to 8 watts/
channel. With a 4 ohm load, the amplifier produces up to
15 watts per channel.
Do not short the + and - outputs to each other, as
this will damage the amplifier.
C
The length of the exposed wires in the stripping process
is critical. The ideal length is 3/16” (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.
N
Do not tin the wires. Tinned wire does not hold its
shape and can become loose over time.
C
MPA 152 Amplifier • Installation
2-14
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MPA 152 Amplifier
Chapter Three
3
Operation
Setting up the MPA 152 Amplifier
Remote Control Options
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Operation
Setting Up the MPA 152 Amplifier
Setting input level
Adjust the MPA 152 input level, bass as follows:
1.
2.
3.
Unplug the remote plug from the unit.
Turn the level potentiometer fully counterclockwise.
Set the volume of the audio source to its maximum level.
No sound should come out.
4.
Slowly increase the MPA 152 level until sound distortion
starts to occur. Lower the level slightly until the distortion
disappears. This setting will ensure that, whatever the
volume setting of the audio source, no clipping will occur.
Setting bass and treble
Adjust the MPA 152 bass and treble as follows:
1.
2.
Use the bass potentiometer to increase or decrease the bass
shelving ±10 dB at 100 Hz and below.
Use the treble potentiometer to increase or decrease the
bass shelving ±10 dB at 10 kHz and above.
Turning the bass or treble potentiometers
N
counterclockwise will decrease the output at the specified
frequencies. Turning the potentiometers clockwise will
increase the output. When the potentiometer is at the
center detent, flat response is achieved.
MPA 152 Amplifier • Operation
3-2
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Remote Control Options
8 ohm Ceiling
Speakers
in Parallel
PC
DVD
VGA w/
S-video
Audio Cable
Audio RCA
S
OUTPUT
L
R
E
T
O
8
4/
s
REM
A
122 PLUS
INPUTS
Ohm
MP
V
10
V
17TTO
L/MUTE
O
S
LISTED
R
TU
ARA
UDIO/VIDE
A
U
S
A
P
P
L
C
R
WE
R
PO
Extron
L
VCR
X
12V
3A MA
MPA 152
Mini Power Amplifier
Composite
Audio RCA
Variable
Audio
Output
1
2
R
O
T
OJEC
ON
PR
OFF
3
4
ComLink
LUME
O
V
G
CONFI
MLC 104 IP
MUTE
LUME
VCM 100 AAP
O
V
2
Extron
MLC 104 IP
Controller
Extron
Projector
3
VCM 100 AAP
Volume/Mute Controller
1
IR Remote
Figure 3-1 — Remote Control Options
Using the projector's IR remote — For a projector with variable
audio outputs, connect the projector audio output to the
MPA 152 audio input. Use the projector's IR remote to control
the projector's volume, which effectively controls the volume of
the MPA 152.
a
Extron VCM 100 AAP volume and mute control — There are a
variety of options for a projector without variable audio outputs,
or for a system designed to control MPA 152 volume directly.
b
c
Using a MediaLink™ Controller — For a projector with variable
audio output, connect the projector audio output to the
MPA 152 audio input. Use a MediaLink controller to adjust
the projector's volume via RS-232. MediaLink controllers can
also use IR remote to adjust the projector's volume and thus the
input to the amplifier.
MPA 152 Amplifier • Operation
3-3
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Operation, cont’d
MPA 152 Amplifier • Operation
3-4
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MPA 152 Amplifier
Appendix A
A
Reference Information
Specifications
Included Parts
Accessories
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Reference Information
Specifications
Audio
Gain
Balanced ............................. 25x (28 dB)
Unbalanced ........................ 50x (34 dB)
Stereo channel separation ............ >60 dB @ 1 kHz
CMRR.............................................. 74 dB @ 1 kHz
Bass adjustment............................. ± 10 dB @ 80 Hz (reference) to 1 kHz
(2 dB tolerance)
Treble adjustment.......................... ± 10 dB @ 10 kHz (reference) to 1 kHz
(2 dB tolerance)
Audio input
Number/Signal Type.................... 1 stereo, balanced/unbalanced input
2 stereo, unbalanced inputs
(The three inputs are individually buffered
and mixed together.)
Connectors ..................................... (1) 3.5 mm captive screw connector, 5 pole
(main input)
(1) 3.5 mm mini audio jack (tip, ring,
sleeve)
1 pair RCA
Impedance...................................... > 10k ohms, balanced/unbalanced, DC
coupled
Nominal level ................................ +4 dBu (1.23 Vrms) balanced or
-10 dBV (316 Vrms) unbalanced
Maximum level.............................. -3 dBV (unbalanced), +3 dBV (balanced)
at 1% THD+N
Input level sensitivity
Balanced ............................. -10 dBV
Unbalanced ........................ -16 dBV
0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV 2 dBu
N
Audio output
Number/Signal type .................... 1 stereo or 2 mono (2 channels total)
Connectors ..................................... (1) 5 mm captive screw connector, 4 pole
Minimum load impedance .......... 4 ohms
Amplifier Type............................... Class D
MPA 152 Amplifier • Reference Information
A-2
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Output power................................ 8 watts (rms) per channel, 8 ohms, 1 kHz,
< 1% THD
15 watts (rms) per channel, 4 ohms, 1 kHz,
< 1% THD
Frequency Response ..................... 20 Hz to 20 kHz, ±3 dB @ 1 watt output
THD + Noise.................................. 0.15% @ 1 kHz at nominal level
(1 watt, 8 ohm load)
S/N.................................................. 74 dB @ 20 Hz to 20 kHz at maximum
output (unweighted with balanced input)
Damping factor.............................. >30 (with a 4 ohm load)
Control/remote — amplifier
Control port.................................... (1) 3.5 mm captive screw connector, 3 pole
Pin configuration........................... Pin 1 = +10 VDC, 50 mA (max.),
Pin 2 = volume/mute (variable voltage),
Pin 3 = GND
Volume control voltage range ..... 0 V (mute) to 10 V (maximum volume)
General
External power supply................. 100 VAC to 240 VAC, 50/60 Hz, external;
to 12 VDC, 3 A (max.), regulated
Power input requirement............. 12 VDC, up to 3A
Temperature/humidity................ Storage: -40 to +158 °F (-40 to +70 °C)/
10% to 90%, noncondensing
Operating: +32 to 122 °F (0° to 50 °C)/
10% to 90%, noncondensing
Cooling ........................................... Convection, no vents
Mounting
Rack mount........................ Yes, with optional 1U, 9.5" deep rack shelf
(RSU 129, # 60-190-01; or RSB 129,
#60-604-01); 1U, 6" deep rack shelf
(RSU 126, # 60-190-10; or RSB 126,
#60-604-10); or VersaTools® 1U, 3.5" deep
rack shelf (RSF 123, #60-190-20; or RSB 123
#60-604-20)
Furniture mount................ Yes, with optional VersaTools® MBU 123
mini under-desk mounting kit (#70-212-01)
Projector mount................. Above-projector mountable with optional
PMK 300 Multi-Product Projector
Mounting Kit (#70-374-01)
Enclosure type ............................... Metal
MPA 152 Amplifier • Reference Information
A-3
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Reference Information, cont’d
Enclosure dimensions................... 1.7" H x 4.3" W x 3" D
(1U high, quarter rack wide)
(4.3 cm H x 10.9 cm W x 7.6 cm D)
(Depth excludes connectors.)
Product weight .............................. 0.6 lbs (0.3 kg)
Shipping weight ............................ 3 lbs (2 kg)
Vibration......................................... ISTA 1A in carton (International Safe
Transit Association)
Regulatory Compliance
Safety................................... CE, CUL, UL
UL rated for use in plenum airspaces;
meets UL 2043 for heat and smoke release,
excluding the power supply; meets
UL 60065 for safety.
EMI/EMC .......................... CE, C-tick, FCC Class B, ICES, VCCI
MTBF............................................... 30,000 hours
Warranty......................................... 3 years parts and labor
All nominal levels are at ±10%
N
N
Specifications are subject to change without notice.
Included Parts
These items are included in each order for an MPA 152:
Included parts
Replacement
part number
MPA 152
60-844-01
External 12 V DC, 3 A power supply
IEC power cord
(1) 4-pole 5 mm terminal block plug
(1) 5-pole 3.5 mm captive screw plug
(1) 3-pole 3.5 mm captive screw plug
(1) 2-pole 3.5 mm power captive screw
plug
Setup Guide — MPA 152
MPA 152 Amplifier • Reference Information
A-4
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Accessories
Accessories
Part number
70-367-01
70-212-01
70-374-01
70-618-03
60-604-20
60-190-20
60-604-10
60-190-10
60-604-01
60-190-01
70-530-02
MBB 100 Back of rack mounting kit
MBU 123 Mini under-desk mounting kit
PMK 300 Projector mounting kit
PMK 450 Projector mounting kit
RSB 123 (3.5" deep, 1U basic rack shelf)
RSF 123 (3.5" deep, 1U rack shelf kit)
RSB 126 (6" deep, 1U basic rack shelf)
RSU 126 (6" deep, 1U rack shelf kit)
RSB 129 (9.5" deep, 1U basic rack shelf)
RSU 129 (9.5" deep, 1U rack shelf kit)
VC 50 Volume control wall plate
VCM 100 AAP Volume/mute - AAP
VCM 100 MAAP Volume/mute - MAAP
MLA VC10 Volume control module
SPK 18 Pre-cut speaker cable
SI 3 (Black, White)
70-396-11
70-397-11
60-502-01
26-627-25
42-105-xx
42-103-03
42-072-xx
42-067-03
SI 3CT LP ceiling speakers
SI 26 (Black, White)
SI 26 X
MPA 152 Amplifier • Reference Information
A-5
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Reference Information, cont’d
MPA 152 Amplifier • Reference Information
A-6
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Extron’s 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 USA
1001 East Ball Road
Anaheim, CA 92805
U.S.A.
Japan:
Extron Japan
Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
China:
Europe, Africa, and the Middle East:
Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands
Extron China
686 Ronghua Road
Songjiang District
Shanghai 201611
China
Asia:
Middle East:
Extron Asia
Extron Middle East
Dubai Airport Free Zone
F12, PO Box 293666
United Arab Emirates, Dubai
135 Joo Seng Road #04-01
PM Industrial Bldg.
Singapore 368363
Singapore
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 non-
Extron authorized modification to the product.
If it has been determined that the product is defective, please call Extron and ask for an
Applications Engineer at (714) 491-1500 (USA), 31.33.453.4040 (Europe), 65.6383.4400
(Asia), or 81.3.3511.7655 (Japan) to receive an RA# (Return Authorization number). This
will begin the repair process as quickly as possible.
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.
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Extron USA - West Extron USA - East Extron Europe
Extron Asia
Extron Japan
Extron China
Extron Middle East
Headquarters
+800.633.9876
+800.3987.6673
+800.7339.8766
+81.3.3511.7655
+81.3.3511.7656 FAX
+400.883.1568
+971.4.2991800
+971.4.2991880 FAX
Inside USA / Canada Only
Inside Europe Only
Inside Asia Only
Inside China Only
+800.633.9876
Inside USA / Canada Only
+1.919.863.1794
+1.919.863.1797 FAX
+31.33.453.4040
+31.33.453.4050 FAX
+65.6383.4400
+65.6383.4664 FAX
+86.21.3760.1568
+86.21.3760.1566 FAX
+1.714.491.1500
+1.714.491.1517 FAX
© 2009 Extron Electronics. All rights reserved.
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