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INSTALLATION
CAUTION! ALL CONNECTIONS AND REAR PANEL SWITCH SETTINGS
SHOULD BE MADE WITH THE AMPLIFIER’S FRONT PANEL MASTER POWER
SWITCH OFF.
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.
21
BRIDGED
USE CH 2
WHEN
BRIDGED
L
R
L+R
1
BUS
L
R
L+R
2
BUS
LEVELLEVEL
19
INSTALLATION
BRIDGED –
12
BRIDGED +
Slide the bridg-
ing switch in the
direction of the
arrow to bridge
two adjacent
amplifier chan-
nels. 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”.
19 Bridging Two Channels into One
20 BusMatrix
TM
Input Switch Setting
21 Setting The Turn-On Mode Switch
21 The Control Output
22 Speaker Wire Connections
23 Line Level Audio Inputs
23 Cascade Audio Outputs
24 AC Power Plug
24 Rail Fuse Holders
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).
CAUTION! Do not connect a speaker
load of less than eight ohms to a
bridged channel.
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.
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.
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+
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