B&K 125.5 S2 User Manual
INPUT/OUTPUT CONNECTIONS
Use either RCA unbalanced or XLR balanced to connect the preamplifier to amplifier.
I N P U T 1
I N P U T 2
I N P U T 3
I N P U T 4
I N P U T 5
I N P U T 6
I N P U T 7
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
X L R
( B A L A N C E D )
R C A
( U N B A L A N C E D )
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
I N P U T 2
I N P U T 1
I N P U T 3
I N P U T 4
I N P U T 5
I N P U T 6
I N P U T 7
BUTTON
OUT
BUTTON
OUT
BUTTON
OUT
BUTTON
OUT
I N P U T 1
I N P U T 2
I N P U T 3
I N P U T 4
I N P U T 5
I N P U T 6
I N P U T 7
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
X L R
( B A L A N C E D )
R C A
( U N B A L A N C E D )
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
I N P U T 2
I N P U T 1
I N P U T 3
I N P U T 4
I N P U T 5
I N P U T 6
I N P U T 7
BUTTON
PUSHED IN
BUTTON
PUSHED IN
BUTTON
PUSHED IN
BUTTON
PUSHED IN
OR
FRONT RIGHT
CENTER
LEFT
SURROUND
LEFT
SURROUND BACK
SURROUND RIGHT
SURROUND BACK RIGHT
FRONT LEFT
RCA Unbalanced Connections
FRONT RIGHT
CENTER
LEFT
SURROUND
LEFT
SURROUND BACK
SURROUND RIGHT
SURROUND BACK RIGHT
FRONT LEFT
XLR Balanced Connections
C O N T R O L I / O
C O N T R O L I / O
CONTROL IN ALLOWS AMPLIFIER
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
CONTROL IN ALLOWS AMPLIFIER
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
C T R L
O U T
1 2 V D C
2 0 0 m A
2 0 0 m A
C T R L
O U T
1 2 V D C
2 0 0 m A
2 0 0 m A
C T R L
I N
C T R L
I N
+12V
L
O
W
P
OWER
+12V
L
O
W
P
OWER
RING
RING
TIP
TIP
GROUND
GROUND
SLEEVE
SLEEVE
+12V
CTRL
ENABLE
+12V
CTRL
ENABLE
SPEAKER OUTPUTS
Binding posts are provided for speaker connections. There is one pair provided for
each amplifier channel output. They are designed to accept a banana-type plug,
spade-lug connector (shown right), terminal posts, or bare wire. They are color
coded for easy identification. The positive (+) RED post should always be connect-
ed to the speakers (+) RED jack. The negative (-) BLACK post should always be
connected to the speakers (-) BLACK jack.
each amplifier channel output. They are designed to accept a banana-type plug,
spade-lug connector (shown right), terminal posts, or bare wire. They are color
coded for easy identification. The positive (+) RED post should always be connect-
ed to the speakers (+) RED jack. The negative (-) BLACK post should always be
connected to the speakers (-) BLACK jack.
Shown right is the ampli-
fier to speaker connec-
tions (4 gauge (AWG)
wire maximum).
fier to speaker connec-
tions (4 gauge (AWG)
wire maximum).
Spade Connector
Banana Jack
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
F U S E
C AU T I O N : F O R C O N T I N U E D
P R O T E C T I O N A G A I N S T R I S K
O F F I R E R E P L A C E O N LY W I T H
S A M E T Y P E A N D R AT I N G .
P R O T E C T I O N A G A I N S T R I S K
O F F I R E R E P L A C E O N LY W I T H
S A M E T Y P E A N D R AT I N G .
C O N T R O L I / O
C H A N N E L 5 O U T P U T
C H A N N E L 4 O U T P U T
C H A N N E L 3 O U T P U T
C H A N N E L 2 O U T P U T
C H A N N E L 1 O U T P U T
C H A N N E L 1 I N P U T
C H A N N E L 2 I N P U T
C H A N N E L 3 I N P U T
C H A N N E L 4 I N P U T
C H A N N E L 5 I N P U T
CONTROL IN ALLOWS AMPLIFIER
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
S E R I A L #
C T R L
I N
C T R L
O U T
1 2 V D C
2 0 0 m A
2 0 0 m A
R C A ( U N B A L A N C E D )
X L R ( B A L A N C E D )
R C A ( U N B A L A N C E D )
X L R ( B A L A N C E D )
P O S I T I V E
N E G AT I V E
P O S I T I V E
N E G AT I V E
P O S I T I V E
N E G AT I V E
P O S I T I V E
N E G AT I V E
P O S I T I V E
N E G AT I V E
A C L I N E
X L R
( B A L A N C E D )
R C A
( U N B A L A N C E D )
RING
TIP
GROUND
SLEEVE
+12V
CTRL
ENABLE
+12V
L
O
W
P
OWER
C A U T I O N
R I S K O F E L E C T R I C S H O C K
D O N O T O P E N
R I S K O F E L E C T R I C S H O C K
D O N O T O P E N
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
C H A N N E L 7 O U T P U T
C H A N N E L 7 I N P U T
P O S I T I V E
N E G AT I V E
FUSE
FUSEFU
SE
FU
SEF
US
E
FUS
E
C H A N N E L 6 O U T P U T
C H A N N E L 6 I N P U T
P O S I T I V E
N E G AT I V E
H i g h Pe r f o r m a n c e
A u d i o / V i d e o S y s t e m s
H a n d - M a d e i n t h e U . S . A .
R C A ( U N B A L A N C E D )
X L R ( B A L A N C E D )
(-)
(+)
Center
Front Left
Front Right
Surround
Right
Surround
Back Right
Surround
Left
Surround
Back Left
Back Left
(-)
(+)
(-)
(+)
(-)
(+)
(-)
(+)
(-)
(+)
(-)
(+)
6