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A.C. O
LED
N
The A.C. O
LED (see Figure 5) indicates that the amplifier's
N
power cord is plugged-into a live AC outlet and its P
ton is ON. If the amplifier's AC fuse ever opens, this LED will
go out. To use the Auto On
feature (see page 8), this
LED must remain ON at all
times.
A
LED
CTIVE
The amplifier's A
LED
CTIVE
(see Figure 5) will illumi-
nate whenever any zone is active. Each zone's Status
Indicators (see Figure 3, on page 5) also contain an
A
LED that will illuminate whenever that particular
CTIVE
zone is ON.
Source Connections
Always use quality high-fidelity interconnect cables such
as Sonance MediaLinQ
®
components are more than 20 feet from the amplifier, use
the Sonance LS2 and LR2 Balanced Line-Level Sender and
Receiver (sold separately) to avoid signal degradation.
NOTE: A
LWAY S C H E C K L O C A L B U I L D
I N G C O D E S B E F O R E I N S TA L L I N G W I R E
.
I N WA L L S O R C E I L I N G S
• Connect stereo source compo-
nents (receiver, preamp, page
signal, etc.) that will feed all 8
channels to the B
L & R inputs
US
(see Figure 6).
• Connect a mono auxiliary
source (page signal, electron-
ic doorbell, etc.) that will feed
all 8 channels to the B
input (see Figure 6).
• Connect zone-specific sources
(audio control system zone
output, video game, etc.) into
the individual channel D
inputs (see Figure 7).
• Connect additional amplifiers
to the buffered B
outputs (see
US
Figure 6). The source connected
to the B
L & R inputs appears
US
at the L and R outputs, and the
source connected to the B
input
appears
at
the
output.
6
OWER
ACTIVE
A.C. ON
F
5: A
IGURE
CTIVE AND
A.C. ON LED
S
Bronze Interconnects. If source
-
BUS
OUTPUT
INPUT
BUFFERED
L
R
A
F
6:
IGURE
BUS I
A
NPUTS
US
UX
O
; AUX I
UTPUTS
& O
UTPUT
IRECT
CH1
CH2
(BRIDGED)
DIRECT
OFF
ON
OFF
LEFT
OFF
ON
OFF
RIGHT
OFF
ON
OFF
AUX
OFF
ON
OFF
F
7:
IGURE
A
US
UX
D
I
IRECT
NPUTS AND
A
I
A
UX
NPUT
SSIGNMENT
DIP S
WITCHES
SONAMP
®
875D MKII 8-CHANNEL AMPLIFIER
Input Assignment DIP Switches
The Sonamp 875D MKII's Input Assignment DIP switches
but-
(see Figure 8) provide flexible configuration options. Settings
are changed by setting the switches either OFF (left) or ON
(right):
DIRECT: Assign channel to the channel D
LEFT:
Assign channel to the B
odd-numbered channels)
RIGHT: Assign channel to the B
even-numbered channels)
AUX:
Assign channel to the B
DIRECT
INPUT
DIRECT
OFF
ON
LEFT
OFF
ON
RIGHT
OFF
ON
AUX
OFF
ON
AUX BUS
INPUT
OFF
OFF
OFF
OFF
F
8: I
IGURE
N O T E : A
L L
I N P U T S
-
S U M M E D
T O G E T H E R
,
O P E R AT I O N
A C T I VAT E B O T H T H E
T
A K E C A R E W H E N S E T T I N G V O L U M E L E V E L S S I N C E S U M M E D
I N P U T S C A N I N C R E A S E S I G N A L G A I N B Y U P T O
See pages 12 – 17 for illustrations of different system
configurations.
&
Input Sensitivity Adjustment
NPUT
There are two ways to adjust the individual channel input
sensitivity (volume) on the 875D MKII:
• The front panel has recessed input
sensitivity potentiometers (see
Figure 9). These can be adjusted
using a small screwdriver.
• Input sensitivity can also be
DIRECT
ON
LEFT
ON
RIGHT
adjusted by serial command
ON
AUX
ON
via
the
amplifier's
input (see page 9).
N O T E : W
H E N T H E
-
B E I N G
S E R I A L
C O N T R O L L E D
O V E R R I D E
T H E
H
,
O W E V E R
I F
IRECT
L input source (default for
US
R input source (default for
US
A
input source
US
UX
LEFT BUS
INPUT
DIRECT
OFF
ON
LEFT
OFF
ON
RIGHT
OFF
ON
AUX
OFF
ON
MONO
OPERATION
DIRECT
DIRECT
ON
OFF
ON
LEFT
LEFT
ON
OFF
ON
RIGHT
RIGHT
ON
OFF
ON
AUX
AUX
ON
OFF
ON
A
DIP S
NPUT
SSIGNMENT
WITCH
D I P
S E L E C T E D
B Y
T H E
.
F
,
O R
E X A M P L E
F O R
B
L
U S
A N D
L
RS-232
(C
8 7 5 D M K I I
I S
,
S E R I A L
V O L U M E
-
I
S
F R O N T
P A N E L
N P U T
E N S I T I V I T Y
-
T H E
F R O N T
PA N E L
C O N T R O L S
input source.
RIGHT BUS
INPUT
DIRECT
OFF
ON
LEFT
OFF
ON
RIGHT
OFF
ON
AUX
OFF
ON
S
ETTINGS
S W I T C H E S
A R E
( L + R )
M O N O
B
R
.
U S
S W I T C H E S
L & R
+ 6 d B .
3 – 4
5 – 6
R
L
R
F
9:
IGURE
I
S
NPUT
ENSITIVITY
A
DJUSTMENTS
3– 6
)
H
SHOWN
C O M M A N D S
W I L L
.
S E T T I N G S
A R E
M A N U A L LY
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