Extron electronic Stereo Amplifier MPA 181T User Manual

User’s Manual  
MPA 181T  
Mini Power Amplifier  
Extron Electronics, USA  
1230 South Lewis Street  
Anaheim, CA 92805  
USA  
714.491.1500  
Fax 714.491.1517  
Extron Electronics, Europe  
Beeldschermweg 6C  
3821 AH Amersfoort  
The Netherlands  
+31.33.453.4040  
Fax +31.33.453.4050  
Extron Electronics, Asia  
135 Joo Seng Road, #04-01  
PM Industrial Building  
Singapore 368363  
+65.6383.4400  
Fax +65.6383.4664  
Extron Electronics, Japan  
Kyodo Building  
16 Ichibancho  
Chiyoda-ku, Tokyo 102-0082 Japan  
+81.3.3511.7655  
Fax +81.3.3511.7656  
68-1082-01  
Rev. A  
02 06  
© 2006 Extron Electronics. All rights reserved.  
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Quick Start Guide — MPA 181T  
To install and set up an MPA 181T Mini Power Amplifier, follow  
these steps:  
Step 1  
Turn all of the equipment off and disconnect it from the power  
source.  
Step 2  
Mount the MPA 181T on a rack, under a desk, or on a projector, as  
illustrated below.  
Step 3  
Attach the speakers to the MPA 181T.  
Extron  
MPA 181  
Rear Plate Mini Power  
Amplifier  
Rubber Pad  
Extron  
PMK 350  
Cable Access  
Above Projector  
Mount Bracket  
LIM  
ITE  
ON  
R
LE  
VE  
L
B
A
SS  
TR  
EB  
LE  
MI  
NI  
M
PO  
P
W
A
ER  
1
AM 81  
ER  
PL  
IFI  
T
Extron  
Power Supply  
for MPA 181  
Front Plate  
Drill pilot holes —  
3/32” (2.4mm) dia.  
1/4” (6.3 mm) deep  
#8 Wood Screws (2 Plcs)  
Each Side  
Cover Sheet  
Cable Access  
Extron PMP  
6”, 10“ or 12”  
Projector Mount  
Pole  
Extron  
UPB 25  
Universal Projector  
Mounting Bracket  
E
L
B
E
R
T
S
T
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S
1
A
8
B
A
1IFIE  
P
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R
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OW  
P
I
IN  
N
M
O
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E
IT  
FF  
I
M
O
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Under Desk  
Machine Screw (2 Plcs)  
Each Side  
Projector Mount  
Projector  
L
IM  
IT  
O
N
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R
O
L
E
FF  
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B
A
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M
IN  
I
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P
A
A
6" Deep Rack Shelf  
O
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181T  
M
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IF  
IE  
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IT  
O
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FF  
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M
IN  
I
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181T  
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IF  
IE  
R
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M
IT  
O
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FF  
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S
Rack Mount  
T
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B
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M
IN  
I
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181T  
A
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IF  
IE  
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IT  
O
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FF  
V
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B
(2) 4-40 x 3/16" screws  
A
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B
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M
IN  
I
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181T  
E
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IF  
IER  
Step 4  
Attach inputs to the MPA 181T unit and the audio source and/or  
projector. Ensure that the projector’s audio output is set to variable  
out. Multiple input options (RCA, 3.5 mm stereo input, or captive  
screw) can be used simultaneously; this results in audio mixing.  
MPA 181T • Quick Start Guide QS-1  
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Table of Contents  
Quick Start Guide — MPA 181T, cont’d  
Chapter 1 • Introduction .......................................................... 1-1  
About this Manual ................................................................ 1-2  
About the MPA 181T ............................................................ 1-2  
Features ...................................................................................... 1-2  
Step 5  
Connect power cords to the MPA 181T and other audio equipment.  
Step 6  
Adjust the MPA 181T input level, bass and  
treble.  
LEVEL  
BASS  
TREBLE  
Chapter 2 • Installation and Operation ......................... 2-1  
Installation Overview.......................................................... 2-2  
a.  
If connecting to a projector,  
ensure that the volume on the  
projector is at its lowest point,  
then adjust the level of the  
MPA 181T  
MINI POWER AMPLIFIER  
Mounting the MPA 181T .................................................... 2-2  
Rack mounting....................................................................... 2-3  
Under-desk mounting ........................................................... 2-4  
Projector mounting ............................................................... 2-5  
MPA 181T fully counterclockwise.  
b.  
c.  
Set the projector volume to its maximum volume level  
(no sound should come out).  
Rear Panel Features.............................................................. 2-7  
Power input ........................................................................... 2-7  
Audio inputs .......................................................................... 2-8  
Remote control ...................................................................... 2-9  
Audio output ......................................................................... 2-9  
Return to the MPA 181T and raise the level until sound  
distortion occurs, then lower slightly until distortion  
disappears. This setting ensures that, whatever the  
projector volume setting may be, no clipping occurs.  
d.  
Adjust bass and treble to preference.  
Front Panel Features .......................................................... 2-10  
Setting Up the MPA 181T Amplifier........................... 2-10  
Remote connector wiring ................................................... 2-11  
Extron  
SI 26CT  
Two-way Ceiling  
PC  
DVD  
S-video  
Audio RCA  
Chapter 3 • Remote Operation ............................................ 3-1  
Remote Control Options .................................................... 3-2  
Speakers  
or  
1T  
8
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IS  
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Appendix A • Specifications, Part Numbers,  
and Accessories.............................................................................. A-1  
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Extron  
SI 26  
Surface-mount  
Speakers  
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A
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2
3
VCR  
1
M
Specifications ......................................................................... A-2  
Included Parts......................................................................... A-5  
Optional Accessories........................................................... A-5  
Composite  
Audio RCA  
Extron  
MPA 181T  
Variable  
Audio  
Mini Power Amplifier  
Output  
R
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T
C
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P
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F
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RS-232  
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1
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2
Extron  
MLC 104 IP  
Controller  
Extron  
3
Projector  
VCM 100 AAP  
Volume/Mute Controller in  
1
IR Remote AAP 100 Mounting Frame  
Remote Control Options  
IR Remote - (input selection and volume control through projector)  
VCM 100 Volume/Mute Controller - (direct MPA 161T control)  
1
2
3
All trademarks mentioned in this manual are the properties of their respective owners.  
68-1082-01  
Rev. A  
MLC 104 IP Controller - (input selection and volume control through projector)  
02 06  
MPA 181T • Quick Start Guide  
QS-2  
MPA 181T • Table of Contents  
i
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Table of Contents, cont’d  
MPA 181T  
Chapter One  
1
Introduction  
About this Manual  
About the MPA 181T  
Features  
ii MPA 181T • Table of Contents  
MPA 181T • Introduction  
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Introduction  
Volume and mute remote control — A rear panel, captive screw  
“Remote” input connector allows for remote control of  
volume adjustment and muting.  
About this Manual  
This manual contains information about the Extron MPA 181T  
Mini Power Amplifier with instructions on how to mount and  
operate the unit.  
Flexible mounting options — The MPA 181T can be mounted  
on a rack, projector, or under furniture.  
About the MPA 181T  
External international power supply — The included  
autoswitchable, 12 VDC, 3 A external power supply  
provides worldwide power compatibility  
(part #70-380-01).  
The Extron MPA 181T is a high performance, compact, single  
channel power amplifier. The MPA 181T delivers 18 watts (rms)  
for 70 Volt line level speakers, 14 watts (rms) for 4 ohm speaker  
loads, and 8 watts (rms) for 8 ohm loads.  
The MPA 181T accepts balanced and unbalanced stereo and  
mono inputs, and outputs a mono audio signal to drive for  
4/8 ohm direct speakers or 70 volt line distribution speakers.  
Front panel controls are provided for input level, bass, and  
treble. The front panel also features a limiter switch which  
automatically reduces the gain to prevent distortion (amplifier  
clipping). The MPA 181T features remote control capability for  
volume adjustment and muting. The MPA 181T, housed in a  
1U, quarter rack width metal enclosure, can be mounted under  
a desk, or mounted on a projector.  
Features  
Class D audio amplifier — The MPA 181T features improved,  
class D technology for high efficiency and low distortion.  
Compact size — The MPA 181T is housed in a 1U high, 1/4 rack  
width, 6" deep, metal enclosure, allowing this amplifier to  
fit in many unique applications.  
Three balanced and unbalanced audio inputs — Balanced or  
unbalanced input are available on the captive screw  
connector, while the 3.5 mm stereo mini jack and RCA  
connectors provide unbalanced input. The captive screw,  
RCA and stereo mini jack connectors are actively mixed  
together, then summed into a mono signal.  
Selectable 70V or direct 4/8 ohm output — Fits distribution  
sound or direct 4/8 ohm applications.  
Quick plug speaker outputs — Speaker output is on a captive  
screw connector for quick installation.  
Front panel controls — Input level, bass, and treble can be  
easily adjusted from the front panel.  
Limiter switch — The limiter switch prevents output distortion  
(clipping) and potential damage to speakers.  
1-3  
MPA 181T • Introduction  
1-2  
MPA 181T • Introduction  
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Introduction  
MPA 181T  
Chapter Two  
2
Installation and Operation  
Installation Overview  
Mounting the MPA 181T  
Rear Panel Features  
Front Panel Features  
Setting up the MPA 181T Amplifier  
MPA 181T • Introduction  
1-4  
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Installation and Operation  
Following are detailed instructions on rack mounting, under-  
desk mounting, and projector mounting the MPA 181T unit (for  
use in classrooms, personal offices, meeting rooms, etc.).  
Installation Overview  
To install and set up an MPA 181T, follow these steps:  
Turn all of the equipment off. Make sure that the input  
devices (DVD, VCR, PC, etc.), the MPA 181T unit, and the  
output devices are turned off and disconnected from their  
power source(s).  
1
Rack mounting  
1.  
If feet were previously installed on the bottom of the  
MPA 181T unit, remove them.  
Mount the MPA 181T unit. See Mounting the MPA 181T  
below.  
2.  
Mount the unit on the rack shelf, using two  
4-40 x 3/16" screws in opposite (diagonal) corners to  
secure the MPA to the shelf. See figure 2-1 below.  
2
3
Attach the speakers and/or other output devices to the  
MPA 181T. See Rear Panel Features later in this chapter for  
more information.  
3.  
Install blank panel(s) or other unit(s) to the rack shelf.  
4.  
Insert the shelf into the rack, aligning the holes in the shelf  
with those in the rack.  
Attach inputs to the MPA 181T. See “Audio inputs” later  
in this chapter for more information.  
4
5.  
Secure the shelf to the rack using the supplied machine  
screws.  
Connect power cords to the MPA 181T and other devices.  
5
6
Adjust MPA 181T input level, bass and treble. See Setting  
up the MPA Amplifier later in this chapter for detailed  
information.  
LIM  
O
ITER  
N
Mounting the MPA 181T  
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6" Deep Rack Shelf  
A
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IF  
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There are many optional accessories for mounting the  
MPA 181T. They include the following part numbers:  
L
IE  
LI  
M
O
ITER  
N
O
F
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F
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B
A
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IF  
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P
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LIM  
ITER  
O
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F
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PMK 300 Multi-Product Projector Mounting Kit  
(70-374-01)  
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1
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IF  
PMK 350 Low Profile Multi-product Projector Mount Kit  
(70-563-02, -03)  
RSU 126 1U 6” Universal Rack Shelf  
(60-190-10)  
LI  
MITE  
R
O
N
O
F
L
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F
V
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L
B
(2) 4-40 x 3/16" screws  
A
S
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B
L
E
RSU 129 1U Universal rack shelf  
RSB 129 1U 6” basic rack shelf  
(60-190-01)  
(60-604-01)  
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IN  
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8
IF  
A
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Figure 2-1 — Rack mounting the MPA 181T  
MBU 125 1U Under-Desk Mounting Kit  
(70-077-01)  
(70-077-02)  
• MBD 129 1U Through-Desk Mounting Kit  
MPA 181T • Installation and Operation  
MPA 181T • Installation and Operation  
2-2  
2-3  
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Installation and operation, cont’d  
6" Deep Rack Shelf  
#8 Wood Screw (2 Plcs)  
Each Side  
Drill pilot holes —  
3/32” (2.4 mm) dia.  
1/4(6.3 mm) deep  
L
IM  
O
IT  
N
E
R
O
1/4 Rack Width False Front  
Face Plate  
F
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IF  
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F
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Machine Screw (2 Plcs)  
Each Side  
Figure 2-3 — Under-desk mounting  
L
IM  
IT  
O
N
E
R
O
F
L
E
F
V
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L
B
(2) 4-40 x 3/16" screws  
A
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B
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M
IN  
M
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1
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8
IF  
IE  
A
1
M
T
R
L
Projector mounting  
Figure 2-2 — Mounting the MPA 181T on the  
RSU shelf  
In addition to mounting the MPA 181T unit to a rack or under  
furniture, it can also be projector mounted using the optional  
kits PMK 350 (part #70-563-02, -03) or PMK 300 (part #70-374-  
01). See figures 2-4 and 2-5 on the following page.  
Under-desk mounting  
In addition to using the MPA 181T unit on a rack or projector, it  
can also be mounted under furniture (or under a desk). Mount  
the unit by using the optional mounting kit (part #70-077-01) for  
furniture, as follows:  
To projector mount the MPA 181T, do the following:  
1.  
If necessary, remove the feet from the bottom of the device  
to be installed.  
2.  
Mount the MPA 181T to one of the bracket’s three  
mounting plates. The device can be horizontally mounted  
facing either up or down, whichever is most convenient.  
See the illustrations on the following page.  
1.  
Attach the mounting brackets to the amplifier with the  
machine screws provided (figure 2-3).  
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.  
Use two supplied 4-40 x 3/16 screws in opposite  
(diagonal) corners to secure the device to the bracket.  
3.  
4.  
5.  
6.  
Drill 3/32" (2 mm) diameter pilot holes, 1/4" (6.3 mm)  
deep in the mounting surface at the marked screw  
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.  
Align the mounting screws with the slots in the brackets  
and place the interface against the surface, with the  
screws through the bracket slots.  
Slide the unit slightly forward or back, then tighten all  
four screws to secure it in place.  
MPA 181T • Installation and Operation  
2-4  
MPA 181T • Installation and Operation  
2-5  
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Installation and operation, cont’d  
6.  
Secure the bracket to the U-bolt onto the ceiling pole with  
the included hex nuts, washers, and lock washers.  
Rear Plate  
Extron  
MPA 181T  
Mini Power  
Amplifier  
Rubber Pad  
Extron  
Clamping  
Plate  
PMK 350  
Above Projector  
Mount Bracket  
Extron  
Cable Access  
MPA 181T  
L
IM  
IT  
ON  
OF  
E
R
LE  
F
VEL  
BA  
M
S
Mini Power  
Amplifier  
S
TREB  
Rubber Pad  
LE  
INI  
M
PO  
P
W
A
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1
A
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81  
P
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FIER  
U-Bolt  
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Power Supply  
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Front Plate  
T
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for MPA 181T  
X
A
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N
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2
1
A
3
R
E
W
O
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Cover Sheet  
Extron  
PMK 300  
Multi Product Projector  
Mount Kit  
Cable Access  
Extron  
PMP  
6, 10or 12”  
Projector Mount  
Pole  
Extron  
UPB 25  
Universal Projector  
Mounting Bracket  
Figure 2-5 — Mounting the PMK 300  
Rear Panel Features  
5
REMOTE  
MPA 181T  
INPUTS  
LISTED  
1T23  
US  
C
I.T.E.  
(MONO)  
10V  
VOL/MUTE  
OUTPUTS  
L
COM 70V  
POWER  
70V  
(MONO)  
R
L
Projector  
4/8 Ohms  
R
12V  
3A MAX  
Figure 2-4 — Using the PMK 350 projector  
mounting kit for the MPA 181T  
1
2
3
4
6
7
Figure 2-5 — MPA 181T back panel  
3.  
4.  
Affix the black rubber pad to the mounting plate.  
Power input  
Place the U-bolt behind, then through the two holes of the  
mounting plate to wrap around the ceiling pole.  
Power connection — Plug the external 12 VDC power  
supply into this connector. The power supply is included  
with the unit.  
1
For a typical (1.5" to 2.0" diameter) pole — The supplied  
U-bolt fits a typical ceiling pole.  
5.  
Place the bracket on the opposing side of the ceiling pole  
and through the U-bolt legs.  
MPA 181T • Installation and Operation  
2-6  
MPA 181T • Installation and Operation  
2-7  
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Installation and operation, cont’d  
To verify the polarity before connection, plug in the power  
supply with no load and check the output with a voltmeter.  
Balanced or unbalanced audio input connector — Marked “L”  
and “R”, this 3.5 mm captive screw input is for bare wire,  
balanced or unbalanced audio signals.  
4
When connecting the power supply, voltage polarity  
is extremely important. Applying power with  
incorrect voltage polarity could damage the power  
supply and the interface. Identify the power cord  
negative lead by the ridges on the side of the cord.  
CAUTION  
Unbalanced Output  
Balanced Output  
Tip  
See Caution  
Sleeve (s)  
Tip  
See Caution  
Tip  
Ring  
Sleeve (s)  
Tip  
Ring  
Figure 2-7 — 3.5 mm captive screw audio input  
connector wiring  
Smooth  
Ridges  
Connect the sleeves to ground (Gnd). Connecting  
the sleeve to a negative (-) terminal will damage the  
audio output circuits.  
CAUTION  
A
A
SECTION A–A  
0.2” (5 mm) MAX  
Power Supply  
Output Cord  
Remote control  
Remote input connector — An optional 5-pin, captive screw  
connector that allows a wall mounted audio controller or  
MediaLink product to remotely control volume and mute levels  
for the MPA 181T unit.  
Captive Screw  
Connector  
5
Figure 2-6 — Power connector wiring  
Do not tin the stripped power supply leads before  
installing the captive screw connector. Tinned wires are  
not as secure in the captive screw connectors and could  
pull out.  
For more information on using the remote input connector, see  
Chapter 3, Remote Operation.  
Output impedance toggle switch — A switch to toggle between  
6
a 70 volt or 4/8 ohm output.  
The two power cord wires must be kept separate  
while the power supply is plugged in. Remove  
power before continuing.  
Audio output  
Speaker connector — This 4-pin, 5 mm captive screw connector  
is used to connect the amplifier to the speakers.  
7
Audio inputs  
There are three choices of input connectors (RCA, 3.5 mm  
stereo, and captive screw) available on the rear panel for  
adapter-free connections.  
Extron  
SI 3CT LP  
70V/100V/8 ohm  
Ceiling Speakers  
All inputs are actively mixed together then summed into a  
mono signal.  
1T  
8
1
A
MP  
D
E
T
IS  
3
L
2
T
1
.
S
V
.
E
T
U
0
S
I
.T  
7
U
M
O
C
UTP  
O
C
E
T
O
M
E
R
RCA input connector — Plug an RCA audio source to this line  
level input.  
V
2
3
70  
S
T
E
T
U
U
V
O
0
V
1
/M  
INP  
L
s
m
)
h
R
O
O
)
N
O
4
/8  
N
O
O
M
(
(
M
L
L
R
E
W
O
P
R
V
A
X
A
2
3
1
M
3.5 mm stereo input — Plug a 3.5 mm audio micro cable into  
Extron  
MPA 181T  
Mini Power  
this stereo jack.  
Amplifier (70V)  
Figure 2-8 — Typical speaker connection  
MPA 181T • Installation and Operation  
2-8  
MPA 181T • Installation and Operation  
2-9  
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Installation and operation, cont’d  
4/8 ohm output 70 volt output  
1.  
If connecting to a projector, ensure that the volume on the  
device is at its lowest point, then adjust the level of the  
MPA 181T fully counterclockwise.  
COM 70V  
COM 70V  
70V  
70V  
4/8 OHM  
4/8 OHM  
+
-
+
-
2.  
3.  
Set the projector volume to its maximum volume level.  
No sound should come out.  
Return to the MPA and raise the level until sound  
+
distortion occurs, then lower the level slightly until any  
distortion disappears. This setting ensures that, whatever  
the projector volume setting may be, no clipping occurs.  
COM 70V  
Figure 2-9 — Output speaker wiring  
The 70 volt output and the 4/8 ohm output cannot  
be used simultaneously.  
4.  
Adjust bass and treble to preference.  
Remote connector wiring  
Front Panel Features  
Options for remote control include the Extron VCM 100 and  
VC 50 volume controllers. Third party 10k potentiometer  
volume controllers can also be connected to this port.  
As shown below, Pin 1 is 10 VDC reference voltage. Pin 2 is  
volume control DC voltage; range is 0 to 10 V, where 0 V is mute  
and 10 V provides maximum volume. Pin 3 is ground.  
ON  
LEVEL  
BASS  
TREBLE  
LIMITER  
1
OFF  
MPA 181T  
MINI POWER AMPLIFIER  
All nominal levels are at 10%.  
Red  
Extron  
Black  
Ground  
3
2
STP 22  
Cable  
REMOTE  
Figure 2-10— MPA 181T front panel  
1
2
3
10V  
VOL/MUTE  
Power LED — A green LED lights to indicate that the unit is  
receiving power.  
1
2
Limiter toggle switch — When the limiter is switched to “On”,  
the MPA will automatically reduce the level to prevent the  
amplifier from clipping.  
3
Potentiometer adjustments — These three potentiometers  
optimize level, bass, and treble adjustments.  
VOLUME  
MUTE  
Setting Up the MPA 181T Amplifier  
When setting up volume control, ensure that the projector  
output is set to variable out. Consult the projector’s user  
VCM 100  
manual for detailed instructions on its calibration.  
Figure 2-11— Pinout diagram for VCM 100 MAAP  
remote connector  
To adjust the MPA 181T input level, bass, and treble, do the  
following:  
2-11  
MPA 181T • Installation and Operation  
2-10  
MPA 181T • Installation and Operation  
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Installation and operation, cont’d  
1
MAX  
MPA 181T  
2K  
2
10K  
MIN  
3
GND  
Figure 2-12 — Pinout diagram for a third party  
volume potentiometer  
See Chapter 3, Remote Operation for more information on the  
three options (IR remote, MLC series, or DC volume/mute  
controller) for remote control.  
Chapter Three  
3
Remote Operation  
Remote Control Options  
MPA 181T • Installation and Operation  
2-12  
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Remote Operation  
Remote Control Options  
MPA 181T  
Extron  
SI 26CT  
Two-way Ceiling  
Speakers  
PC  
DVD  
S-video  
Audio RCA  
or  
1T  
8
1
A
MP  
D
E
T
IS  
3
L
2
T
1
.
E
S
C
V
T
.
T
U
7
0
S
I.  
U
M
P
O
T
U
O
C
E
T
O
M
E
R
V
0
7
S
T
E
T
U
U
V
0
O
P
1
V
/M  
IN  
L
m
)
h
R
O
)
O
N
O
4
/8  
N
O
O
(M  
(
M
L
L
R
E
W
O
P
R
Extron  
V
A
X
A
2
3
VCR  
1
M
SI 26  
Surface-mount  
Speakers  
Composite  
Extron  
MPA 181T  
Mini Power Amplifier  
Audio RCA  
Variable  
Audio  
Output  
R
O
T
C
E
J
O
R
P
F
F
O
N
O
RS-232  
E
M
U
L
O
V
IG  
F
N
O
C
P
I
4
0
1
C
L
M
E
T
U
M
P
A
E
A
0
0
M
U
1
L
O
M
V
C
V
Appendix A  
2
Extron  
Extron  
VCM 100 AAP  
Volume/Mute Controller in  
MLC 104 IP  
Controller  
3
Projector  
A
1
IR Remote AAP 100 Mounting Frame  
Remote Control Options  
IR Remote - (input selection and volume control through projector)  
VCM 100 Volume/Mute Controller - (direct MPA 161T control)  
1
2
3
MLC 104 IP Controller - (input selection and volume control through projector)  
Specifications, Part Numbers,  
and Accessories  
Figure 3-1 — Three remote control options  
Using the projector’s IR remote — For a projector with variable  
1
audio outputs, use the projector’s IR remote to control the  
projector’s volume, which effectively controls the MPA’s  
volume.  
Specifications  
Included Parts  
Extron VCM 100 and mute controller — For a projector without  
2
variable audio outputs, or for a system designed to control MPA  
volume directly, use a 10k ohm potentiometer to control the  
MPA directly via the remote port on the MPA.  
Optional Accessories  
Using a MediaLink™ Controller — For a projector with  
3
variable audio output, use a MediaLink controller to control the  
projector’s volume via RS-232 or the projector’s IR remote to  
effectively control the MPA volume.  
MPA 181T • Remote Operation  
3-2  
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Specifications, Part Numbers, and Accessories  
Input level sensitivity ................. -16 dBV (158 mV) from unbalanced input  
for maximum output (18 watts at 70 V  
Specifications  
output and with the level set to  
maximum) before clipping  
Audio  
Frequency response  
0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV 2 dBu  
8 ohm direct output......... 20 Hz to 20 kHz, 1.5 dB  
70 V output ....................... 110 Hz to 20 kHz, +0.5/-3 dB  
Audio output  
Number/signal type ................... 1 single channel (mono) 70 V output or  
1 direct 4 or 8 ohm speaker output  
Connectors .................................... (1) 5 mm captive screw connector, 4 pole  
Minimum load impedance ......... 2 ohms  
THD + Noise ................................ 0.1% @ 1 kHz at nominal level  
(1 watt, 8 ohm load, or 70 V output)  
S/N ................................................ >72 dB @ 20 Hz to 20 kHz at maximum  
output (unweighted)  
CMRR ............................................ >80 dB @ 1 kHz, >70 dB @ 20 kHz  
Bass adjustment ........................... 10 dB @ 100 Hz (reference) to 1 kHz  
(2 dB tolerance)  
Treble adjustment ........................ 10 dB @ 10 kHz (reference) to 1 kHz  
(2 dB tolerance)  
Amplifier type .............................. Improved Class D  
Continuous power with a full load and 1% THD  
70 V system ....................... 18 watts (rms)  
At 4 ohms .......................... 14 watts (rms)  
At 8 ohms .......................... 8 watts (rms)  
Damping factor ............................ >30 (with a 4 ohm load)  
Audio input  
Number/signal type ................... 1 stereo/mono, balanced/  
unbalanced input  
Control/remote — amplifier  
Control port .................................. (1) 3.5 mm captive screw connector, 5 pole  
Pin configuration ......................... Pin 1 = 10 V, pin 2 = volume/mute control  
voltage, pin 3 = GND  
2 stereo/mono, unbalanced inputs  
(The three inputs are individually  
buffered and mixed together. Stereo  
signals are actively summed into a mono  
signal)  
General  
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  
External power supply ............... 100 VAC to 240 VAC, 50/60 Hz, external,  
autoswitchable; to 12 VDC, 3 A (max.),  
regulated  
Power input requirements ......... 12 VDC, up to 3 A  
Temperature/humidity .............. Storage: -40 to +158 °F (-40 to +70 °C) /  
10% to 90%, noncondensing  
Impedance .................................... 18k ohms unbalanced, 23k ohms  
balanced, DC coupled  
Nominal level  
Operating: +32 to +122 °F (0 to +50 °C) /  
10% to 90%, noncondensing  
RCA and mini jack .......... -10 dBV (316mVrms) (unbalanced)  
Captive screw ................... +4 dBu, (1.23mVrms) (balanced)  
Rack mount ................................... Yes, with optional 1U rack shelf, part #60-  
190-10 or 60-604-10. Also furniture  
mountable with optional Mini Under-  
Desk Mounting Kit, #70-077-10 or  
mountable to a projector mount with  
optional kits PMK 350 (#70-563-02, -03) or  
PMK 300 (#70-374-01).  
Maximum level  
Level pot. at 11 o’clock.... +6 dBV (unbalanced), +16 dBu (balanced)  
at 1% THD+N  
Level pot. at 9 o’clock...... +16 dBV (unbalanced), +23 dBu (balanced)  
at 1% THD+N  
Enclosure type .............................. Metal  
MPA 181T • Specifications, Part Numbers, and Accessories  
A-2  
MPA 181T • Specifications, Part Numbers, and Accessories  
A-3  
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Specifications, Part Numbers, and Accessories  
Enclosure dimensions ................. 1.7" H x 4.3" W x 6.0" D (1U high, quarter  
rack wide)  
Included Parts  
These items are included in each order of a MPA 181T unit:  
4.3 cm H x 10.9 cm W x 15.2 cm D  
(Depth excludes connectors.)  
Product weight............................. 1.2 lbs (0.5 kg)  
Shipping weight........................... 6 lbs (3 kg)  
Vibration ....................................... ISTA 1A in carton (International Safe  
Transit Association)  
Included parts  
Part number  
MPA 181T Mini Power Amplifier  
12 VDC, 3 A external power supply  
(2) 5-pin, 3.5 mm captive screw conn.  
2-pin, 3.5 mm captive screw conn.  
4-pin, 5 mm terminal block plug  
60-747-01  
70-380-01  
10-319-10  
10-319-03  
10-163-14  
MPA 181T Mini Power Amplifier User’s Manual  
IEC power cord  
Tweeker  
Optional Accessories  
Accessories  
Part number  
PMK 300 Multi-Product Proj Mount Kit  
70-374-01  
PMK 350 Low Profile Multi-product Proj Mount Kit  
70-563-02, -03  
RSU 126 1U 6” Universal Rack Shelf  
RSU 129 1U Universal rack shelf  
60-190-10  
60-190-01  
60-604-01  
70-077-01  
70-077-02  
RSB 129 1U 6” basic rack shelf  
MBU 125 1U Under-Desk Mounting Kit  
MBD 129 1U Through-Desk Mounting Kit  
VCM 100 AAP volume and mute control  
70-396-11,  
-21, -51  
VCM 100 MAAP volume and mute control  
70-397-11,  
-21, -51  
MPA 181T • Specifications, Part Numbers, and Accessories  
A-4  
MPA 181T • Specifications, Part Numbers, and Accessories  
A-5  
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Specifications, Part Numbers, Accessories, cont’d  
MPA 181T • Specifications, Part Numbers, and Accessories  
A-6  
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