Nortek Control MC960PA User manual

1
The lightning flash with arrowhead symbol within an
equilateral triangle is intended to alert the user to the
presence of un-insulated “dangerous voltage” within the
product’s enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the product.
PRINTER’S INSTRUCTIONS:
INSTR,INSTL,MC960PA - LINEAR P/N: 227569 A - INK: BLACK - MATERIAL: 20 LB. MEAD BOND - SIZE: 8.500” X 11.000” - SCALE: 1-1 - FOLDING: ALBUM FOLD - BINDING: SADDLE STITCH
INTRODUCTION
The Model MC960PA Remote Power Amplifier is an optional upgrade stereo power amplifier designed for use with the
dmc1 and dmc3-4 Music/Communication System Masters. The wall mounted amplifier can power up to ten pairs of
45-ohm intercom speakers for stereo sound distribution. Each pair of speakers connects to the MC960PA amplifier
through a Model SVC96 or SVC96I Stereo Volume Control. Monaural installations with up to 20 speakers per amplifier
are also supported using Model MVC1 or MVC1A Monaural Volume Controls. The volume control sets the sound level
in the room for the specific pair of speakers.The MC960PA amplifier connects to 120 VAC for power. Wiring connections
are provided for connecting up to three MC960PA amplifiers per system for increased speaker capacity.
MC960PA REMOTE POWER AMPLIFIER
INSTALLATION INSTRUCTIONS
Read Instructions - All the safety and operating
instructions should be read before the appliance is
operated.
Retain Instructions - The safety and operating
instructions should be retained for future reference.
Heed Warnings - All warnings on the appliance and in the
operating instructions should be adhered to.
Follow Instructions - All operating and use instructions
should be followed.
Water and Moisture - The appliance should not be used
near water - for example: near bathtub, washbowl, kitchen
sink, laundry tub, in a wet basement, or near a swimming
pool, and the like.
Attachments - Do not use attachments not recommended
by the product manufacturer as they may cause hazards.
Ventilation - The appliance should be situated so that
its location or position does not interfere with its proper
ventilation. For example, the appliance should not be
situated on a bed, sofa, rug, or similar surface that may block
the ventilation openings: or, placed in a built in installation,
such as a bookcase or cabinet that may impede the flow of
air to the ventilation openings.
Heat - The appliance should be situated away from heat
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to
a power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - Precautions should be taken
so that the grounding or polarization means of an appliance
is not defeated.
Power Lines - An outdoor antenna should be located
away from power lines.
Outdoor Antenna Grounding - If an outside antenna is
connected to the receiver, be sure the antenna system is
grounded so as to provide some protection against voltage
surges and built up static charges. Section 810 of the
National Electrical Code, ANSI/NFPA No.70 1984, provides
information with respect to proper grounding of the mast
and supporting structure, grounding of the lead in wire to
an antenna discharge unit, size of grounding conductors,
location of antenna discharge unit, connection to grounding
electrodes, and requirements for the grounding electrode
(see figure).
Object and Liquid Entry - Never push objects of any
kind into this product through openings as they may touch
dangerous voltage points or short out parts that could
result in a fire or electric shock. Never spill liquid of any
kind on the product.
Servicing - The user should not attempt to service
the appliance beyond that described in the operating
instructions. All other servicing should be referred to
qualified service personnel.
Damage Requiring Service - The appliance should be
serviced by qualified service personnel when:
■The power supply cord or the plug has been
damaged; or
■Objects have fallen, or liquid has been spilled
into the appliance; or
■The appliance has been exposed to rain; or the
appliance does not appear to operate normally
or exhibits a marked change in performance; or
■The appliance has been dropped, or the
enclosure damaged.
■When the product exhibits a distinct change in
performance - this indicates a need for service.
Replacement Parts - When replacement parts are
required, be sure the service technician has used
replacement parts specified by the manufacturer or have
the same characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock, or other
hazards.
Safety Check - Upon completion of any service or repairs
to this product, ask the service technician to perform safety
checks to determine that the product is in proper operating
condition.
Wall or Ceiling Mounting - The product should be
mounted to a wall or ceiling only as recommended by the
manufacturer.
SAFETY INSTRUCTIONS
IMPORTANT DO’S & DON’TS
DO ensure that all instructions have been followed before power is applied to system.
DO use only M&S systems brand cable as called out in these instructions. The cable
is designed and constructed with electrical specifications necessary for proper audio
performance.
DO NOT power up master until all speakers and the amplifier are connected.
DO NOT splice cables.Splices are unreliable and defeat the signal isolation
properties of the cable.
DO NOT coil or bundle the cables. This can cause electronic feedback.
✔
✔
✔
✔
✔
DO NOT connect extra cables to the amplifier. If extra cables have been run for
possible future speaker additions, care must be taken that these cables do not get
connected. Un-terminated cables may damage the master or amplifier.
DO NOT over-tighten the screws for the volume controls, speakers, intercom master,
or the amplifier to prevent cracking.
DO NOT install any amplifier or speaker cables inside the 120 VAC J-box.
DO NOT install the amplifier in a generator room.
✔
✔
✔
✔

2
INSTALLATION PLANNING
The remote power amplifier should be located in a closet
or utility room within 6 feet of a standard NEMA 5-15R
120 VAC receptacle wired to a dedicated 10-amp circuit
breaker. Do not install the amplifier in an attic or in a humid
environment. DO NOT INSTALL ANY AMPLIFIER OR
SPEAKER CABLES INSIDE THE 120 VAC J-BOX! Do not
install within 18” of light controls, switches, or fan controls.
Determine the locations for each speaker pair (or single
speakers in monaural installations).
Determine the locations for the volume control for each
speaker area.
INSTALLATION ROUGH-IN
Install a single-gang and a two-gang J-box on each side of
a wall stud at the amplifier mounting location. Be sure to
space the two boxes apart so the bottom edges are 9-1/4”
apart. This will allow the wires to align with the wiring holes
on the MC960PA mounting plate.
If additional MC960PA amplifiers are going to be used for a
multi-amplifier installation (up to three amplifiers per system
allowed), repeat the above steps by installing another two
J-boxes at each amplifier’s location.
For the speaker areas, install a single-gang J-box for each
volume control. Install any speaker rough-in rings required
to mount the speakers.
CABLE ROUTING
Route MS7X5SC cable from the dmc1H or dmc1HC wall
housing to the single-gang J-box installed for the amplifier.
If additional MC960PA amplifiers are going to be used for
a multi-amplifier installation, route MS7X5SC cable from
the primary amplifier’s single-gang J-box to the second
amplifier’ssingle-gangJ-box,thenfrom thesecond amplifier’s
single-gang J-box to the third amplifier’s single-gang J-box.
Route MS5X5SC cable from the double-gang J-box installed
for the amplifier(s) to each volume control J-box.
Route MS2SX5SC cable from each volume control J-box to
each speaker location.
WIRE PREPARATION
Prepare both ends of all cables.
1. On MS2SX5SC and MS5X5SC cables, strip off
the cable’s jacket four inches back.
2. On MS7X5SC cables, strip off the cable’s jacket two inches back.
3. On the MS5X5SC cables, the gray and brown wires are
not used. Cut off these two wires, their foil shield, and their
enclosed shield wire at the end of the cable’s jacket.
4. Pull back the remaining foil shield(s) and separate the
bare shield wire(s). Note: There are two foil shields
and two shield wires on MS7X5SC cable.
5. Tear off all foil shields at the end of the cable’s jacket.
6. Separate the colored wires from each other.
7. On MS2SX5SC and MS5X5SC cables, strip off
the colored wire insulation 1/2” back.
8. On MS7X5SC cables, strip off the colored wire insulation 1/4” back.
DOUBLE-GANG
OR LARGER
J-BOX
SINGLE-GANG
J-BOX
BOTTOM
EDGES9-1/4"
APART
WALL STUD
MS5X5SC CABLES
TO VOLUME
CONTROLS
MS7X5SC CABLE
FROM INTERCOM
MASTER
MS7X5SC CABLE TO
SECOND MC960PA
AMPLIFIER (OPTIONAL)
Figure 1. J-box Rough-in
L
R
L
R
L
R
L
R
DMC1 OR DMC3-4
MASTER INTERCOM
45-OHM
STEREO
SPEAKER
PAIRS
45-OHM
MONAURAL
SPEAKERS
OPTIONAL
ADDITIONAL
MC960PA
AMPLIFIER
PRIMARY
MC960PA
AMPLIFIER
MS7X5SC
CABLE
MS7X5SC
CABLE
MS5X5SC
CABLE
MS5X5SC
CABLE
MS2SX5SC
CABLE
VOLUME
CONTROLS
EACH AMPLIFIER
CAN BE EITHER
STEREO OR MONAURAL
MS2SX5SC
CABLE
Figure 2. Cable Routing
Figure 3. Wire Preparation
4 INCHES
MS7X5SC
7-CONDUCTOR
CABLE
MS5X5SC
5-CONDUCTOR
CABLE
MS2SX5SC
2-CONDUCTOR
CABLE
1/2 INCH
STRIP
4 INCHES
1/2 INCH
STRIP
CUT OFF
BROWN & GRAY
WIRES
SHIELD WIRE
SHIELD WIRE
1/4 INCH
STRIP
2 INCHES
YELLOW JACKET
BROWN JACKET
GREEN JACKET

3
AMPLIFIER MOUNTING
The MC960PA amplifier installs on the wall stud where the
two J-boxes have been mounted. The amplifier’s mounting
plate has three protective wiring bushings. The cables
from the J-boxes route through these bushings. When the
amplifier is properly mounted, the bushings will align with
the J-box openings.
1. Loosen the four side screws, remove the fifth case screw near
the power connector. Remove the cover of the amplifier. Discard
all cardboard and packing pieces from the amplifier.
2. With a stud finder, locate the center of the
stud and mark it on the wall.
3. Hold the amplifier centered on the wall stud so the wiring
bushings align with the J-boxes. Mark the location for
the top mounting screw at the top of the keyhole slot
on the mounting plate. Set the amplifier down.
4. Screw one of the mounting screws provided into the
location marked in Step 3. Leave the screw head
out a bit so the keyhole slot will fit over it.
5. Hold the amplifier up to the wall and route the cables
through the wiring bushings. Hang the amplifier
on the screw through the keyhole slot.
6. Install the bottom mounting screw supplied into the stud
through the bottom hole in the mounting plate.
7. Tighten both screws.
INTERCOM MASTER HOOKUP
The MC960PA amplifier input connects to the dmc1 or dmc3-4
auxiliary audio output.The wiring connections are made using
8-position plug-in terminal blocks. Each MC960PA amplifier
is supplied with two of these plug-in terminal blocks.
1. Remove the plug-in terminal block from the MC960PA connector
labeled TO SECOND AMP by pulling the screw terminal
part straight up from the circuit board. This plug-in terminal
block will be used will be used on the Intercom Master end of
the MS7X5SC cable to connect the cable to the master.
2. Connect the Intercom Master end of the MS7X5SC
cable to the plug-in terminal block (see Figure 5).
3. Plug the terminal block into the Intercom Master’s
auxiliary audio output connector.
AMPLIFIER INPUT HOOKUP
There are two connectors on the MC960PA amplifier. One
labeled PREAMP INTERCONNECT is the low-level audio input
for the amplifier that comes from the Intercom Master. The
second connector labeled TO SECOND AMP is only used in
multi-amplifier installations. It serves as a low-level audio
output that connects to the next amplifier’s input.
1. Remove the plug-in terminal block from the MC960PA
connector labeled PREAMP INTERCONNECT.
2. Connect the amplifier end of the MS7X5SC cable
to the plug-in terminal block (see Figure 5).
3. Plug the terminal block into the MC960PA connector
labeled PREAMP INTERCONNECT.
KEYHOLE
SLOT
TOP
MOUNTING
SCREW
BOTTOM
MOUNTING
SCREW
MS5X5SC
OUTPUT
CABLESTO
VOLUME
CONTROLS
MS7X5SC INPUT
CABLE FROM
INTERCOM MASTER
MC960PA
AMPLIFIER
FROM
INTERCOM
MASTER
TO VOLUME
CONTROLS
WALL
STUD
Figure 4. Amplifier Mounting
MASTER AUXILIARY
OUTPUT CONNECTOR
MS7X5SC CABLE
TO AMPLIFIER
PLUG TERMINAL
BLOCK INTO
MASTER
SHIELD
WIRE
END
BLUE
WIRE
END
INTERCOM
MASTER
Figure 6. Intercom Master Hookup
PLUG TERMINAL
BLOCK INTO PREAMP
INTERCONNECT
CONNECTOR ON
AMPLIFIER
MC960PA
AMPLIFIER
SHIELD
WIRE
END
BLUE
WIRE
END
MS7X5SC CABLE
FROM MASTER
Figure 7. Amplifier Input Hookup
CONNECT WIRES
ON BOTH ENDSOF
MS7X5SC CABLESTO
TERMINAL BLOCKSIN
THISORDER
MS7X5SC
CABLE
BOTH SHIELD
DRAIN WIRES
BLUE
YELLOW
RED
BLACK
WHITE
VIOLET
GREEN
SHIELDS
Figure 5. Terminal Block Wiring

4
MULTI-AMPLIFIER INSTALLATION
Up to two additional MC960PA amplifiers can be connected
to the primary amplifier for increased speaker capacity. On
each amplifier, the connector labeled TO SECOND AMP serves
as a low-level audio output for the next amplifier’s input.
1. On the additional amplifiers, remove both plug-in terminal blocks.
2. Connect each end of the additional amplifier’s MS7X5SC cable
(routed during rough-in) to the plug-in terminal blocks (see Figure 7).
3. On the primary MC960PA amplifier, plug the terminal
block into the connector labeled TO SECOND AMP.
4. On the second MC960PA amplifier, plug the terminal
block on the cable from the primary amplifier into the
connector labeled PREAMP INTERCONNECT.
5. On the second MC960PA amplifier, plug the terminal
block on the cable to the third amplifier into the
connector labeled TO SECOND AMP.
6. On the third MC960PA amplifier, plug the terminal
block on the cable from the second amplifier into the
connector labeled PREAMP INTERCONNECT.
STEREO/MONAURAL CONFIGURATION
The MC960PA amplifier has a jumper block that selects
stereo or monaural operation. The factory setting, with the
jumper on one pin, selects stereo operation. When the
jumper block is placed on the two pins, monaural operation
is selected. In multi-amplifier installations, each amplifier’s
jumper can be set independently.
Stereo Operation
When the amplifier is operating in stereo mode, the GREEN
output terminal is the left channel and the VIOLET output
terminal is the right channel. Up to ten left-right pairs of
45-ohm speakers (20 speakers total), with each speaker pair
wired through a stereo volume control, can be connected to
the amplifier. The two WHITE output terminals are common.
Monaural Operation
When the amplifier is operating in monaural mode, the
left and right channels are combined. The GREEN output
terminal and the VIOLET output terminal produce the same
signal. Each terminal is capable of powering up to ten
45-ohm speakers (20 speakers total), with each speaker
wired through a monaural volume control. The two WHITE
output terminals are common.
AMPLIFIER OUTPUT WIRING
Five large screw terminals at the top of the amplifier connect
to the MS5X5SC cables that route to the volume controls.
Two other terminals at the top left of the amplifier (GRAY &
BROWN) are not used in this application.
1. Connect the GREEN wires from all the MS5X5SC
cables to the MC960PA GREEN terminal.
2. Connect the VIOLET wires from all the MS5X5SC
cables to the MC960PA VIOLET terminal.
3. Connect the WHITE wires from all the MS5X5SC
cables to either MC960PA WHITE terminal.
4. Connect the SHIELD wires from all the MS5X5SC cables to
the MC960PA SHIELD terminal. To prevent shorting to other
terminals, insulate bare shield wires with leftover cable jackets.
Figure 8. Multi-amplifier Hookup
JUMPER IN
STEREO POSITION
(FACTORY SETTING)
JUMPER IN
MONAURAL POSITION
MC960PA
AMPLIFIER
Figure 9. Stereo/Monaural Jumper
MS5X5SC CABLESTHROUGH BUSHINGSTO VOLUME CONTROLS
SHIELD
TERMINAL
GREEN
TERMINAL
(LEFT CHANNEL)
TWO WHITE
TERMINALS
(COMMON)
VIOLET
TERMINAL
(RIGHT CHANNEL)
CAUTION!
A MAXIMUM OF TEN 45-OHM INTERCOM SPEAKERSCAN BE CONNECTED
TO THE GREEN TERMINAL AND TEN 45-OHM INTERCOM SPEAKERSCAN
BE CONNECTED TO THE VIOLET TERMINAL. EXCEEDING THISNUMBER OF
SPEAKERSOR USING 8-OHM SPEAKERSWILL OVERLOAD THE AMPLIFIER.
USE CABLE
JACKETSTO
INSULATE
SHIELD
WIRES
Figure 10. Amplifier Output Wiring
DMC1 OR DMC3-4
MASTER INTERCOM
PRIMARY
MC960PA
AMPLIFIER
MS7X5SC
CABLE
MS7X5SC
CABLE
"TO SECOND AMP"
CONNECTOR
SECOND
MC960PA
AMPLIFIER
THIRD
MC960PA
AMPLIFIER
"PREAMP
INTERCONNECT"
CONNECTOR
MS7X5SC
CABLE
"TO SECOND AMP"
CONNECTOR
"PREAMP
INTERCONNECT"
CONNECTOR
"PREAMP
INTERCONNECT"
CONNECTOR
CONNECT WIRES
ON BOTH ENDSOF
MS7X5SC CABLESTO
TERMINAL BLOCKSIN
THISORDER
MS7X5SC
CABLE
BOTH SHIELD
DRAIN WIRES
BLUE
YELLOW
RED
BLACK
WHITE
VIOLET
GREEN
SHIELDS

5
VIOLET
VIOLET
VIOLET
VIOLET
BLUE
BLUE
BLUE
BLUE
SHIELD SHIELD
SHIELD
WHITE
VIOLET
GREEN
GRAYBROWN
THESE WIRESARE
NOT CONNECTED
MS5X5SC CABLE
FROM MC960PA
AMPLIFIER
MS2SX5SC
SPEAKER
CABLE
MS2SX5SC
SPEAKER
CABLE
SVC96
STEREO
VOLUME
CONTROL
45-OHM
INTERCOM
SPEAKERS
LEFTRIGHT
INSULATE SHIELD
WIRESWITH LEFTOVER
CABLE JACKETS
Figure 11. Stereo Volume Control & Speaker Wiring
STEREO VOLUME CONTROL
& SPEAKER WIRING
Each stereo speaker pair is connected to the MC960PA amplifier through
a Model SVC96 Stereo Volume Control. MS5X5SC cable connects the
amplifier to the volume control. MS2SX5SC cable connects the volume
control to the speakers. Use wire nuts for the following connections. To
prevent shorting to the back of the volume control, insulate bare
shield wires in the J-box with leftover cable jackets.
Volume Control End of the Brown Amplifier Cable
1. Connect the MS5X5SC cable’s GREEN wire to the
SVC96 GREEN wire labeled MASTER.
2. Connect the MS5X5SC cable’s VIOLET wire to the
SVC96 VIOLET wire labeled MASTER.
3. Connect the MS5X5SC cable’s WHITE wire to the
SVC96 WHITE wire labeled MASTER.
Volume Control End of the Yellow Speaker Cables
1. Connect the two MS2SX5SC speaker cable’s SHIELD
wires to the MS5X5SC cable’s SHIELD wire.
2. Connect the left speaker’s MS2SX5SC cable’s VIOLET wire
to the SVC96 VIOLET wire labeled L SPEAKER.
3. Connect the left speaker’s MS2SX5SC cable’s BLUE wire
to the SVC96 BLUE wire labeled L SPEAKER.
4. Connect the right speaker’s MS2SX5SC cable’s VIOLET wire
to the SVC96 VIOLET wire labeled R SPEAKER.
5. Connect the right speaker’s MS2SX5SC cable’s BLUE wire
to the SVC96 BLUE wire labeled R SPEAKER.
Speaker End of the Yellow Speaker Cables
1. Connect the left speaker’s MS2SX5SC cable’s VIOLET wire
to the left speaker’s VIOLET (or BLACK) wire.
2. Connect the left speaker’s MS2SX5SC cable’s BLUE wire to the
left speaker’s BLUE (or RED) wire. Cut off the SHIELD wire.
3. Connect the right speaker’s MS2SX5SC cable’s VIOLET wire
to the right speaker’s VIOLET (or BLACK) wire.
4. Connect the right speaker’s MS2SX5SC cable’s BLUE wire to the
right speaker’s BLUE (or RED) wire. Cut off the SHIELD wire.
MONAURAL VOLUME CONTROL
& SPEAKER WIRING
Each monaural speaker is connected to the MC960PA amplifier through
a Model MVC1 Monaural Volume Control. MS5X5SC cable connects the
amplifier to the volume control. MS2SX5SC cable connects the volume
control to the speaker. Use wire nuts for the following connections.
NOTE: To keep the amplifier balanced, split the total number of speakers
evenly as possible between the GREEN and VIOLET output wires.
Volume Control End of the Brown Amplifier Cable
1A. For half of the monaural speakers (up to 10), connect the MS5X5SC cable’s GREEN
wire to the MVC1 GREEN wire labeled MASTER and cut off the cable’s VIOLET wire.
1B. For half of the monaural speakers (up to 10), connect the MS5X5SC cable’s VIOLET
wire to the MVC1 GREEN wire labeled MASTER and cut off the cable’s GREEN wire.
2. For all monaural speakers, connect the MS5X5SC cable’s
WHITE wire to the MVC1 RED wire labeled MASTER.
Volume Control End of the Yellow Speaker Cables
1. Connect the MS2SX5SC speaker cable’s SHIELD wire
to the MS5X5SC cable’s SHIELD wire.
2. Connect the MS2SX5SC cable’s VIOLET wire to the
MVC1 VIOLET wire labeled SPEAKERS.
3. Connect the MS2SX5SC cable’s BLUE wire to the
MVC1 BLUE wire labeled SPEAKERS.
Speaker End of the Yellow Speaker Cables
1. Connect the MS2SX5SC cable’s VIOLET wire to the
speaker’s VIOLET (or BLACK) wire.
2. Connect the MS2SX5SC cable’s BLUE wire to the speaker’s
BLUE (or RED) wire. Cut off the SHIELD wire.
✔VIOLET
VIOLET
IMPORTANT!
UP TO TEN 45-OHM SPEAKERS
CAN BE CONNECTED TO THE
VIOLET WIRE AND UP TO TEN
45-OHM SPEAKERSCAN BE
CONNECTED TO THE GREEN
WIRE. CUT OFF THE UNUSED
VIOLET OR GREEN WIRE AT
EACH VOLUME CONTROL.
BLUE
BLUE
SHIELD
RED
GREEN
MS2SX5SC
SPEAKER
CABLE
MVC1
MONAURAL
VOLUME
CONTROL
45-OHM
INTERCOM
SPEAKER
VIOLET
MS5X5SC CABLE
FROM MC960PA
AMPLIFIER
SHIELD
WHITE
GREEN
- OR -
GRAY
BROWN
THESE WIRESARE
NOT CONNECTED
INSULATE SHIELD
WIRESWITH LEFTOVER
CABLE JACKETS
Figure 12. Monaural Volume Control & Speaker Wiring

6
POWER UP AND TESTING
Before applying power, double check all the wiring
connections at the master, the amplifier, and the volume
controls.
1. Complete any necessary installation of the Intercom
Master, its Room Stations, and accessories.
Install the master into its wall housing.
2. Complete any finish-out required for the volume
controls. Set each volume control to mid level.
3. Complete any finish-out required for the speakers.
4. Replace the amplifier’s cover and tighten the cover screws.
5. Apply power to the Intercom Master. For testing, select
a strong FM radio station on the master. Verify that the
station’s audio is coming out of the master’s speaker.
6. Insert the female end of the 120 VAC line cord into the power
input plug on the bottom of the MC960PA amplifier.
7. Plug the male end on the line cord into the wall receptacle
designated for the amplifier. (In multi-amplifier installations,
repeat Steps 4, 6, & 7 for the additional amplifiers.)
8. When the amplifier(s) is powered up, the radio station playing on
the master should also be playing on all the system speakers.
9. Go to each volume control and test the
performance at each speaker area.
TROUBLESHOOTING
If a problem is encountered after completing the installation,
refer to the following troubleshooting table for a guide to
correcting the problem.
TROUBLESHOOTING TABLE
SYMPTOM SOLUTION
NO AUDIO OUTPUT
1. AC line cord not connected.
2. No 120 VAC power at AC outlet.
3. Verify that audio is playing at the master.
4. Check the audio input connectors on the amplifier. Verify that the wire colors are correct and that the plug-in connectors are
firmly seated.
5. Check the audio output connector on the master. Verify that the wire colors are correct and that the plug-in connectors are fi r m l y
seated.
6. Re-check all wiring per these installation instructions.
7. Check for a blown amplifier fuse. If the fuse is blown the amplifier was overloaded. THE AMPLIFIER IS DESIGNED FOR
45-OHM SPEAKERS ONLY!DO NOT USE 8-OHM SPEAKERS!
Replace the fuse (lower right corner of circuit board, under a clear snap-on cover) with a 2 amp, 250 V, 5 x 20 mm, SLO-BLO®
fuse (Littelfuse®part number 218002).
AUDIO DISTORTION
1. Check for ground loops. Shielded cables should only be grounded (with the shield “drain” wire) at the source end.
2. Check for mechanical vibration at the speakers. Verify that the speaker mounting is secure and there is no loose hardware.
Check for wires or cables touching the back of the speaker’s cone.
3. Possible damaged speaker, swap with another and test again.
LOSS OF BASS
(STEREO ONLY)
1. Check for stereo speaker pairs wired out of phase (wires flipped on one speaker). Listen to the pair while moving from one
speaker to the other. An abrupt change from one speaker to the other indicates a possible phasing problem.
VOLUME CONTROLS INOPERATIVE 1. Check for a wiring error. Re-check all wiring per these installation instructions.
SHORTED POWER AMP
(HOT HEAT SINKS, DISTORTED
AND/OR LOW SOUND,THERMAL
SHUTDOWN)
1. Shorts to ground through shield drains at volume controllers or at the Power Amp (ensure shield drains are isolated).
2. Verify the speakers connected are 45-ohm speakers (8-ohm speakers can appear as a short).
3. Install only ten 45-ohm speakers per channel.
4. On the SVC96 (stereo volume control) install only 1 speaker per channel (one for left, one for right) – MAXIMUM OF TWO
45-OHM SPEAKERS PER SVC96 STEREO VOLUME CONTROL.
5. On the MVC1 (monaural volume control) install only 1 speaker – MAXIMUM OF ONE 45-OHM SPEAKER PER MVC1
MONAURAL VOLUME CONTROL.
INSERT LINE CORD INTO
POWER INPUT PLUG
Figure 13. AC Line Cord Connection

7
Figure 14. Amplifier Wiring Overview
SHIELD GREEN WHITE VIOLETN/CN/C
N/C N/C N/C
STEREO/MONO
JUMPER MONAURAL
STEREO
POWER FUSE
2 AMP
SLO-BLO
FOR CONTINUED PROTECTION
AGAINST FIRE, REPLACE WITH
THE SAME TYPE FUSE ONLY
BLUE YELLOW RED BLACK WHITE VIOLET GREEN SHIELD
MS7X5SC FROM INTERCOM MASTER
OR FROM ANOTHER MC960PA AMPLIFIER
MS7X5SC TO ADDITIONAL MC960PA AMPLIFIER
MS5X5SC TO VOLUME CONTROL
UP TO 10 PAIRSOF 45-OHM SPEAKERSCAN BE
CONNECTED TO THE GREEN (LEFT CHANNEL) AND
VIOLET (RIGHT CHANNEL) TERMINALS,
EACH PAIR THROUGH AN SVC96 VOLUME CONTROL
STEREO INSTALLATIONS
UP TO 10 45-OHM SPEAKERSCAN BE CONNECTED
TO THE GREEN TERMINAL,
UP TO 10 45-OHM SPEAKERSCAN BE CONNECTED
TO THE VIOLET TERMINAL,
EACH SPEAKER THROUGH AN MVC1 VOLUME CONTROL
MONAURAL INSTALLATIONS
USE 45-OHM SPEAKERSONLY!
OR AMPLIFIER OUTPUTS
AMPLIFIER INPUT
TO SECOND AMP
PREAMP INTERCONNECT
MC960PA
REMOTE POWER AMPLIFIER
UNPLUG THE POWER CORD BEFORE
REMOVING THE AMPLIFIER COVER
WARNING!
DO NOT WIRE SPEAKERSIN SERIES

A Linear Home Technologies Brand
Copyright © 2007 Linear LLC 227569 A
M&S Systems Brand & AirVac Brand
2-Year Limited Warranty
Linear LLC warrants its M&S Systems and AirVac brand products to be free of defects
for 2 years except for the WG Series Speakers and AirVac Platinum and Red series
power units (see below).The warranty period begins on either (a) the date of purchase or
installation date of this product, or (b) the date of closing on a new residence in which this
product was originally installed.
The warranty extends to the original user of the product and to each subsequent owner
of the product during the term of the warranty. Linear will repair or replace, at its option,
parts and materials at no charge. Parts supplied under this warranty may be new or rebuilt
at the option of Linear.
If, during the warranty period, the product appears to have a defect, please call our toll
free number (800-421-1587) prior to dismantling. Dismantling the product prior to calling
our service number may void the warranty. Before returning any product to Linear, obtain
a Return Product Authorization (RPA) number from our service department. Linear will
return the repaired product freight prepaid within the continental United States. ANY
PRODUCT RETURNED TO LINEAR WITHOUT AN RPA NUMBER WILL BE REFUSED.
This limited warranty is in lieu of any other warranties, express or implied, including any
implied warranty of merchantability or fitness for a particular purpose or otherwise, and
of any other obligations or liability on the seller’s part. This limited warranty does not
cover damage caused by improper installation, acts of God, criminal acts, the violation of
applicable building or electrical codes or the use of non-M&S wire, cable (excluding CAT-5
and RG-6) or wall housings.
Under no circumstances shall Linear be liable for consequential, incidental or special
damages arising in connection with use, or inability to use this product. In no event shall
Linear’s liability hereunder exceed the cost of the product covered hereby. No person is
authorized to assume for us or obligate us for any other liability in connection with the
sale of this product. Some states do not allow the exclusion or limitation of consequential,
incidental or special damages, so the above limitation or exclusion may not apply to you.
This limited warranty gives you specific legal rights, and you may also have other rights,
which vary from state to state.
5/10-Year Limited Warranty for AirVac Platinum and
Red Series Power Units and WG Series Speakers
Linear offers a 10-Year Warranty on our AirVac Platinum series power units and WG Series
Speakers (5-Years on AirVac Red series power units). This warranty is identical to the
M&S Systems & AirVac 2-Year Warranty, with the exception that this warranty covers the
AirVac Platinum and Red series power units and WG Series Speakers for 5 or 10 years
instead of 2. This Linear warranty applies ONLY to the AirVac Platinum and Red series
power units and WG Series Speakers and to no other M&S Systems products, AirVac
products, or M&S Systems 8-ohm speaker products.