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NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
2 Channel, BridgaBle Power amPlifiers
INSTALLATION
BRIdGING TwO ChANNELS INTO ONE
The SI-1230’s bridging switches allow you to create a more powerful amplier
channel by combining or “bridging” two adjacent channels.
STEP DESCRIPTION
1. Choose which of the six pairs you wish to
bridge and move the bridging switch for that
pair to the “Bridged” position (toward arrow).
The 12 channels are grouped into 6 pairs (e.g. 1 & 2). Only
the two channels within a pair can be bridged. Thus, only
channels 1 and 2, or channels 3 and 4 could be bridged.
You cannot bridge 2 and 3 for example.
CAUTION! Do not connect a speaker load of
less than eight ohms to a bridged channel.
A bridged channel on a SI-1230 is designed for an eight
ohm minimum load. Connecting a speaker with a nominal
impedance of less than 8 ohms may cause the SI-1230 to
go into protection or be damaged.
2. Connect the speaker wires to the two
Bridged speaker terminals (BRIDGED
+, BRIDGED -). Observe proper polarity
markings.
Connect your speaker wire only to the red terminals of the
two adjacent amplifier channels. If one of the speaker wires
touches a black terminal (thereby grounding the red “hot”
terminals) you will short circuit the amplifier.
CAUTION! DO NOT connect a speaker selector
or headphone junction box to the output of a
bridged channel pair.
These connections to a bridged channel pair will result in
either thermal shutdown or poor quality sound.
3. Use the EVEN NUMBERED input, DIP switch,
and level control for connections and
configuration.
When two channels are bridged into one, make sure that
the odd numbered input DIP switches are all in the “off”
position.
100-120 / 220-240 V~
50 / 60 Hz, 500W
TURN ON MODE
AUDIO SENSE
L
MAIN
BUS
INPUT
R
CONSTANT
3-30V
AC/DC
TRIGGER
INPUT
L
CASCADE
BUS
OUTPUT
R
12V CONTROL OUT
SI-1230 SERIES 2
Systems Integration Amplif ier
®
1
LEVEL
BRIDGED - BRIDGED +
1 2
LEVEL
BUS
USE CH 2
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
2
BUS
L
R
L+R
1
L
R
L+R
2
+
-
3
LEVEL
BRIDGED - BRIDGED +
3 4
LEVEL
BUS
USE CH 4
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
4
BUS
L
R
L+R
3
L
R
L+R
4
+
-
3
LEVEL
BRIDGED - BRIDGED +
3 4
LEVEL
BUS
USE CH 4
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
4
BUS
L
R
L+R
3
L
R
L+R
4
+
-
5
LEVEL
BRIDGED - BRIDGED +
5 6
LEVEL
BUS
USE CH 6
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
6
BUS
L
R
L+R
5
L
R
L+R
6
+
-
7
LEVEL
BRIDGED - BRIDGED +
7 8
LEVEL
BUS
USE CH 8
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
8
BUS
L
R
L+R
7
L
R
L+R
8
+
-
9
LEVEL
BRIDGED - BRIDGED +
9 10
LEVEL
BUS
USE CH 10
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
10
BUS
L
R
L+R
9
L
R
L+R
10
+
-
11
LEVEL
BRIDGED - BRIDGED +
11 12
LEVEL
BUS
USE CH 12
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
12
BUS
L
R
L+R
11
L
R
L+R
12
+
-
CAUTION: REPLACE WITH SAME TYPE AND
RATING FUSE
100-120V : T10AL/250V
FUSE:
100-120V ~
220-240V ~
220-240V : T5AL/250V
Niles Audio, Carlsbad, California, USA
Designed and Engineered in the U.S.A. Made in China.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept any interference
received, including interference that may cause undesired operation.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme
NMB-003 du Canada.
Serial No.
BRIDGED –
12
BRIDGED +
Slide the bridging
switch in the direction
of the arrow to bridge
two adjacent amplifier
channels. Set the
controls of the newly
bridged pair by using
the EVEN numbered
channel.
When two channels are bridged
together, connect speakers to the
two terminals labeled “Bridged”.