Niles SI-1230 Series 2 Installation Manual page 23

INSTALLATION
BRIdGING TwO ChANNELS INTO ONE
The SI-1230's bridging switches allow you to create a more powerful amplifier
channel by combining or "bridging" two adjacent channels.
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.
2
LEVEL LEVEL LEVEL
L
R
BUS BUS
L+R
2
D MODE) (8 Ω MINIMUM IN BRIDGED MODE) (8 Ω MINIMUM IN BRIDGED MODE)
RIDGED + BRIDGED - BRIDGED -
STEp
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).
2
CaUTIon! Do not connect a speaker load of
less than eight ohms to a bridged channel.
2. connect the speaker wires to the two
bridged speaker terminals (briDGeD
+, briDGeD -). observe proper polarity
markings.
CaUTIon! Do noT connect a speaker selector
or headphone junction box to the output of a
bridged channel pair.
3. use the eVen numbereD input, DiP switch,
and level control for connections and
configuration.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
2 Channel, BridgaBle Power amPlifiers
3 3 4 4
BRIDGED BRIDGED
USE CH 4 USE CH 4 LEVEL LEVEL
WHEN WHEN
BRIDGED BRIDGED
L L L L
R R R R
BUS BUS
L+R L+R L+R L+R
3 3 4 4
4 4 MINIMUM MINIMUM
BRIDGED + BRIDGED +
+ +
- -
3 3 4 4
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Slide the bridging
5
switch in the direction
BRIDGED
of the arrow to bridge
two adjacent amplifier
channels. Set the LEVEL USE CH 6
WHEN
controls of the newly
BRIDGED
bridged pair by using
the EVEN numbered
L
R
channel.
BUS BUS
L+R
5
4 MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED -
DESCrIpTIon
+
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.
-
5
a bridged channel on a Si-1230 is designed for an eight
CLASS II WIRING
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.
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.
These connections to a bridged channel pair will result in
either thermal shutdown or poor quality sound.
when two channels are bridged into one, make sure that
the odd numbered input DiP switches are all in the "off"
position.
Niles Audio, Carlsbad, California, USA
Designed and Engineered in the U.S.A. Made in China.
When two channels are bridged
6
together, connect speakers to the
two terminals labeled "Bridged".
BRIDGED –
LEVEL
L
R
BUS
L+R
6
1
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED + BRIDGED -
6
7 8
BRIDGED
BRIDGED +
LEVEL USE CH 8 LEVEL
WHEN
BRIDGED
L
R
BUS
L+R
7
2
4 MINIMUM
BRIDGED +
+
-
7 8
CLASS II WIRING
23