4
M
ULTI-AMPLIFIER INSTALLATION
Up to two additional MC960PA amplifi ers can be connected
to the primary amplifi er for increased speaker capacity. On
each amplifi er, the connector labeled
TO SECOND AMP
serves
as a low-level audio output for the next amplifi er’s input.
1. On the additional amplifi ers, remove both plug-in terminal blocks.
2. Connect each end of the additional amplifi er’s MS7X5SC cable
(routed during rough-in) to the plug-in terminal blocks (see Figure 7).
3. On the primary MC960PA amplifi er, plug the terminal
block into the connector labeled
TO SECOND AMP
.
4. On the second MC960PA amplifi er, plug the terminal
block on the cable from the primary amplifi er into the
connector labeled
PREAMP INTERCONNECT
.
5. On the second MC960PA amplifi er, plug the terminal
block on the cable to the third amplifi er into the
connector labeled
TO SECOND AMP
.
6. On the third MC960PA amplifi er, plug the terminal
block on the cable from the second amplifi er into the
connector labeled
PREAMP INTERCONNECT
.
S
TEREO/MONAURAL CONFIGURATION
The MC960PA amplifi er 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-amplifi er installations, each amplifi er’s
jumper can be set independently.
Stereo Operation
When the amplifi er 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 amplifi er. The two
WHITE
output terminals are common.
Monaural Operation
When the amplifi er 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.
A
MPLIFIER OUTPUT WIRING
Five large screw terminals at the top of the amplifi er connect
to the MS5X5SC cables that route to the volume controls.
Two other terminals at the top left of the amplifi er (
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-amplifi er Hookup
JUMPER IN
S
TEREO PO
S
ITION
(FACTORY
S
ETTING)
JUMPER IN
MONAURAL PO
S
ITION
MC960PA
AMPLIFIER
Figure 9. Stereo/Monaural Jumper
M
S
5X5
S
C CABLE
S
THROUGH BU
S
HING
S
TO VOLUME CONTROL
S
S
HIELD
TERMINAL
GREEN
TERMINAL
(LEFT CHANNEL)
TWO WHITE
TERMINAL
S
(COMMON)
VIOLET
TERMINAL
(RIGHT CHANNEL)
CAUTION!
A MAXIMUM OF TEN 45-OHM INTERCOM
S
PEAKER
S
CAN BE CONNECTED
TO THE GREEN TERMINAL AND TEN 45-OHM INTERCOM
S
PEAKER
S
CAN
BE CONNECTED TO THE VIOLET TERMINAL. EXCEEDING THI
S
NUMBER OF
S
PEAKER
S
OR U
S
ING 8-OHM
S
PEAKER
S
WILL OVERLOAD THE AMPLIFIER.
U
S
E CABLE
JACKET
S
TO
IN
S
ULATE
S
HIELD
WIRE
S
Figure 10. Amplifi er Output Wiring
DMC1 OR DMC3-4
MA
S
TER INTERCOM
PRIMARY
MC960PA
AMPLIFIER
M
S
7X5
S
C
CABLE
M
S
7X5
S
C
CABLE
"TO
S
ECOND AMP"
CONNECTOR
S
ECOND
MC960PA
AMPLIFIER
THIRD
MC960PA
AMPLIFIER
"PREAMP
INTERCONNECT"
CONNECTOR
M
S
7X5
S
C
CABLE
"TO
S
ECOND AMP"
CONNECTOR
"PREAMP
INTERCONNECT"
CONNECTOR
"PREAMP
INTERCONNECT"
CONNECTOR
CONNECT WIRE
S
ON BOTH END
S
OF
M
S
7X5
S
C CABLE
S
TO
TERMINAL BLOCK
S
IN
THI
S
ORDER
M
S
7X5
S
C
CABLE
BOTH
S
HIELD
DRAIN WIRE
S
BLUE
YELLOW
RED
BLACK
WHITE
VIOLET
GREEN
S
HIELD
S
