MPA 401-70V and MPA 401-100V • Setup Guide
This guide provides basic instructions for an experienced installer to install and configure the
Extron MPA 401-70V and MPA 401-100V mini power amplifiers.
Extron
SI 3CT LP
Full-Range
Ceiling Speakers
Extron VC 50
Volume Controller
VOLUME
Ex tro n
VC
50
Extron
MLC 104 IP Plus
Controller
INPUTS
(MONO
R
POWE
R
L
(SUM
MED)
INPUT
US
LIST
AP
PAR
ED
T
17T
AU
DIO
EO
/VID
ATU
S
R
L (SUMMED)
10V
10V
2 WIRING
T
CLASS
OR SHOR
REMOT
E
VOL/MUTE
A
MP
A 401-100V
T
UTPU
100V O
70V
CLASS 2
ING
WIR
C
G
REMOTE
R
12V
1.5A M
AX
1.5A MA
X
DISP
Y
ON
LU ME
CO
NF
IG
MLC
104 IP
Extron
MPA 401
Mini Power
Amplifier
Extron
DVS 304 DVI AD
Digital Video
Scaler with Audio
100
-24 0V
.3A
50/ 60
Hz
R
INPUTS
R
R
O
AUDI
R
Audio
OU
TPU
T
R
SD
Y
/VID
R-Y
/C
4
-Y,Y
,B-Y
RG
B/R
DV
I-I
YC
U
T
N
P
U
T
N
P
1
VID 2
B-Y 3
R
/RY
G
/Y
B
/B-
Y
O
U
P
U
T
P
U
T
RE
SE
AC
LA
N
LINK
V
H/
HV
RS-
232
Flat Panel
Display
(DVI)
VCR
(Video)
DVD
(Component)
DSS Receiver
(S-video)
DB
S R EC
EIV ER
Laptop
(RGB)
Step 1 — Turn all of the equipment off and disconnect all power sources.
Step 2 — Mount the amplifier in either a plenum space, on a rack, under a desk, or on a projector.
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 be plenum rated.
NOTE: Use only the two round mounting holes for mounting the MPA 401. The other four (hexagonal) holes anchor stand-offs for the internal circuit boards. Using them may damage the amplifier and does not provide secure mounting for the unit.
100V OUTPUT OUTPUT
Step 3 — Attach the speakers to the MPA 401 using the 2-pole, 5 mm screw-lock captive screw speaker receptacle on the rear panel. (The old and new silk screens for the
MPA 401-100V are shown to the right).
ATTENTION: Do not ground or short the speaker outputs as this will damage the amplifier.
CLASS 2 WIRING
100V
NOTE: The mono audio speaker receptacle may be labeled in one of two ways (see the images to the right). The wiring and function are the same whichever way the product is labeled.
Step 4 — Attach sources to the MPA 401 unit from the audio source or projector.
The three rear panel audio inputs can be used individually or together: z z z
One pair of RCA receptacles (unbalanced)
One 3.5 mm stereo tip-ring-sleeve receptacle (unbalanced)
One 3.5 mm, 5-pole captive screw receptacle (balanced or unbalanced)
Tip (+)
Sleeve ( )
RCA Connector
Tip
Sleeve
Tip
Sleeve
Unbalanced Stereo Input
Tip
Ring
Sleeves
Tip
Ring
Balanced Stereo Input
Tip
Sleeve
Unbalanced Mono Input
Tip
Ring
Sleeve
Tip (L)
Ring (R)
Sleeve ( )
3.5 mm TRS Connector
Balanced Mono Input
1
MPA 401-70V and MPA 401-100V • Setup Guide (Cont’d)
NOTES:
• The input receptacle may be labeled in one of two ways: the ground pins of the input connector port may be labeled or (see the images to the right). The wiring and function are the same whichever way the product is labeled
• The MPA 401 amplifier sums the left and right signals from both the TRS and RCA inputs to form Sum 1. Sum 1 is then weighted. At the same time, the amplifier sums the left and right signals from the captive screw input to form Sum 2. Sum 1 and Sum 2 are then summed together to form a single mono signal. See figure 6 on page 9 of the
MPA 401 Series User Guide for more details.
• The captive screw, RCA and TRS inputs are buffered.
Ensure that the audio output of the projector is set to variable out. Multiple input options can be used simultaneously and result in summing.
L
(SUMMED)
R
INPUTS
INPUTS
L (MONO)
R
L
(SUMMED) R
L (MONO) R
Step 5 — Connect power cords to the MPA 401 and other audio equipment. The MPA 401 ships with an Extron 36 W desktop power supply.
Connect the pre-wired captive screw connector into one of the two pole,
3.5 mm captive screw outlets on the power supply and the other end into the power receptacle on the amplifier (see the figure to the right). The power cord connectors are correctly wired when shipped.
ATTENTION:
• See the attention notices in the Power Input section of the
MPA 401 Series User Guide for important information about using power supplies.
• When the 36 W power supply is connected to the MPA 401, it must not be shared with any other devices.
MPA 401 series
Amplifier
12V
1.5A MAX
Power Receptacle
DC Power Cord
Captive Screw Connector
36 W Power Supply
AC Power Cord
Tie
Wrap
DC Power
Outputs
Captive Screw
Connector
Power Supply
Output Cord
Step 6 — Adjust the MPA 401 input level, bass, and treble from the front panel (see figure at right).
LEVEL BASS TREBLE
1.
2.
3.
4.
5.
If necessary, unplug the remote connector from the unit (see step 7, below).
If connecting the amplifier to a system with adjustable volume, set the volume to its lowest point. Then adjust the MPA 401 front panel level potentiometer fully counterclockwise.
Set the system volume to its maximum volume level (no sound should come out).
Return to the MPA 401 and raise the level until sound distortion first occurs, then lower slightly until the distortion disappears.
This setting ensures that, whatever the system volume setting may be, no clipping occurs.
Adjust bass and treble to preference.
Step 7 — The rear panel 3-pole Remote captive screw receptacle on the amplifier can be used for remote control of the volume by an Extron volume controller such as an Extron
VCM 100 AAP, VC 50, or MLA VC10 Plus. A MediaLink controller can also adjust the audio volume via a network connection or by IR remote (see the MPA 401 Series User Guide).
REMOTE
10V 50mA
MPA 401
MINI POWER AMPLIFIER
10V 50mA
VOL/MUTE
NOTE: Control signal ground pins may be labeled as or “G.” The wiring and function are the same, whichever way the product is labeled.
V C G
REMOTE
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Rev C 05 13
2
