3
REAR PANEL
1
6
5
7
8
3
2
4
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
CAUTION: FOR CONTINUED
PROTECTION AGAINST RISK
OF FIRE REPLACE ONLY WITH
SAME TYPE AND RATING.
CONTROL I/O
CHANNEL 3 OUTPUT
CHANNEL 2 OUTPUT
CHANNEL 1 OUTPUT
PLUS
+
MINUS
-
PLUS
+
MINUS
-
PLUS
+
MINUS
-
CHANNEL 1 INPUT
CHANNEL 2 INPUT
CHANNEL 3 INPUT
+
CONTROL IN ALLOWS AMPLIFIER
OPERATION WHEN A 5-24V SIGNAL
IS APPLIED WITH A 3.5mm MINI JACK
XLR (BALANCED)
RCA (UNBALANCED)
XLR (BALANCED)
RCA (UNBALANCED)
XLR (BALANCED)
RCA (UNBALANCED)
B&K Components, Ltd.
Made in the U.S.A.
www.bkcomp.com
RCA INPUT
XLR INPUT
RCA INPUT
RCA INPUT
XLR INPUT
XLR INPUT
B K
&
S
B
IMPLY
ETTER!
SERIAL #
AC LINE
-
CHANNEL 1 OUTPUT
CHANNEL 2 OUTPUT
CHANNEL 3 OUTPUT
FU
S
E
FU
SE
F
U
SE
FU
S
E
FU
SE
F
U
SE
FU
S
E
FU
SE
F
U
SE
*
*
*
*
*
CTRL
IN
CTRL
OUT
12VDC
125mA
1. AC Fuse Holder
- holds the AC Line fuse. This fuse is a 15 Amp / 250 Volt Slow Bow fuse. Replace only with
the same type and value fuse.
2. AC Input Receptacle
- for attaching the supplied AC power cord to the amplifier.
3. Speaker Outputs
- for connecting the speakers to the amplifier. Explained further on page 6.
* On the
ST125.2, channel 3 is not available. On the ST125.1 mono amplifier, all output channels source the same
information with the speaker outputs remaining fused independently.
4. Speaker Fuses
- for protection against amplifier damage in the case of shorted speaker wires. Replace fuse
with the same type and value 6 AMP T-Lag.
* On the ST125.2, channel 3 is not available. On the ST125.1 mono
amplifier, all outputs remain fused independently.
5. Balanced Input
- for connecting signal patch cables (interconnects) from the preamplifier to the amplifier.
Explained further on Page 4. *
On the ST125.2, channel 3 is not available. On the ST125.1 mono amplifier,
channels 2 and 3’s XLR Balanced connections are not available.
6. Balanced/Unbalanced Input Select
- this switch is used to configure an AMPLIFIER PAIR for use as either
balanced (XLR) or RCA unbalanced line inputs. This switch controls two amplifier channels and allows signal
patch cables (interconnects) to be sourced from either balanced or unbalanced, preamplifier/processor or line
outputs. Explained further on Page 4. *
On the ST125.2, channel 3 is not available. On the ST125.1 mono
amplifier, channels 2 and 3’s Balanced/Unbalanced Input Selectors, are not available.
7. RCA Input
- for connecting signal patch cables (interconnects) from the preamplifier to the amplifier. Explained
further on Page 4. *
On the ST125.2, channel 3 is not available. On the ST125.1 mono amplifier, channels 2 and
3’s RCA Unbalanced connections are not available.
8. Amplifier Control Input/Output
- provides remote switching of the amplifier’s standby on/off feature.
Explained further on page 8.
