Niles SI-1260 Installation & Operation Manual page 21

Bridging 'TWo Channels into One
The 51-1260's bridging switches allow you to create a more powerful amplifier chan-
nel
by
combining or "bridging" l\.vo adjacent amplifier channels together into one.
Figure 17-
Bridged Channel Connedions
When two channels are
bridged
together. connect
speakers to the two terminals
labeled "Bridged".
A
Figure 16-
Channel Bridging Switch and DIP Switches
... NORMAL/BRIDGED.....
Slide the bridging
switch in the direc-
tion of the arrow to
bridge two adjacent
amplifier channels.
Set
the controls of
the newly bridged
pair by using the
EVEN
numbered
channel.
STEP DESCRIPTION
1. Choose which of the six pairs you The
12 channels
aTC
grouped into 6 pairs
wish to bridge and move the bridging (e.g. 1 & 2). Only
the
two channels within a
switch for that pair to the "Bridged" pair can be bridged. Thus, only channels 1
position (toward arrow).
and 2,
Of
channels 3 and 4 could
I:X!
bridged. Channel 2 and 3 are not a pair and
cannot be bridged.
A
CAUTION! DO NOT CONNECT A
Each bridged channel is designed for a 4
SPEAKER LOAD OF LESS THAN
ohm minimum load. Connecting multiple
4 OHMS TO A BRIDGED CHAN-
speakers to a single channel, creating a
NEL.
nominal impedance
0(
less th;m 4 ohms
may cause the 51.1260 to go into protection
mode or be damaged.
2. Connect the speaker wires to the
Connect the speaker wires
10
Ihe two adja·
two bridged speaker terminals
cent amplifier channel's RED terminals only.
(BRIDGED+, BRIDGED-). Carefully
NOTE:
If one of the speaker wires touches a
observe the polarity markings.
BlACK terminal,
you
will short-circuit the
amplifier.
A CAUTION! DO NOT CONNECT A
These connections to a bridged channel
HEADPHONE JUNCTION BOX TO
pair will cause either thermal shutdown
THE OUTPUT OF A BRIDGED
or poor quality sound.
CHANNEL PAIR.
3. Use the EVEN NUMBERED BosMalr;,,'
When two channels are bridged into one,
switch bank and level control
to<
the
ensure that the odd numbered DIP
adjustments
and configuration of a
switches are all in the "OFF" position.
bridged channel.