DETAILED INSTALLATION 6
III. BRIDGED SETUP
WARNING:
Disconnect the amplifier's power cord from the AC supply and set the power switch
to OFF before adjusting the mode switch or connecting or disconnecting any cables
to avoid potential damage to your speakers.
Technical Note:
In bridged mode the XLR input receptacles are internally connected to each other
according to the diagram below.
The S12.5 normally operates in stereo mode, providing a maximum output power of
50 watts Class A (into an 8-ohm load) per channel. In BRIDGED mode, both channels
act as one amplifier providing a maximum output power of 200 watts. For extremely
high-power multi-channel audio applications, multiple S12.5 amplifiers can be used
in place of one medium-power stereo amp.
To configure the amplifier for bridged mode operation, set the mode switch on the
back panel to the BRIDGED setting as shown in the diagram below.
In bridged mode only one audio input is used. No other input should be connected,
and the bridged mode input must be a BALANCED signal connected to the XLR
receptacle labeled BRIDGED INPUT. Bridged mode will not operate correctly with an
input adapted from an unbalanced signal. Connecting the input signal to the
receptacle not labeled BRIDGED INPUT will cause no damage, but will cause the
speaker terminal polarities to reverse, so should be avoided in the interest of
consistency in labeling.
The amplifier’s speaker terminals are reconfigured in bridged mode. The left channel
positive terminal becomes the bridged negative terminal and the right channel
positive terminal becomes the bridged positive terminal.
See the next page for a diagram of a stereo amplifier configuration using two
bridged mode S12.5 amplifiers. Speaker terminals in the diagram are marked with
their bridged mode polarities.
PUSH
2
1
3
PUSH
2
1
3
Bridged Mode XLR Wiring
BRIDGED
STEREO
MODEL
SERIAL NUMBER
MODE
Back of AMPLIFIER S5
MODEL
SERIAL NUMBER
BRIDGED
STEREO
MODE
PUSH
PUSH
Back of AMPLIFIER S12.5