Specifications
Bridge
Mode 15
5.
Bridge
Mode
The
term BRIDGE
is used when two independent
amplifier channels are used to drive the same load.
The load is in series
(a
bridge) between the two
amplifier channels.
Channel A
is
used as
the "dominanl"
channel
and
its
output is in
phase
with the
inpul
signal, and channel
B has to have its
phase
reversed so it is exactly 1800
out of
phase
with
the
input
signal.
As two amplifiers with a
phase
difference of 1800 are
now driving the load
you
will now have double the
vollage into
lhe load.
This
means
you
will
now
have
four times the
power
into that load. The output can
now be considered as an active balanced output.
Acommon
use of anamplifierin BRIDGE mode is for
driving 70 volt & 100 voltdistribuion lines. ln BRIDGE
mode, The AM3o02 can
produce
in excess of140 volls
into line impedances
greater
than 8 ohms.
Equally the units can be used in bridge mode to
provide
the correct voltage/power requirements for
an applicable load.
Asshown in Figure 6, there arefoursteps in setting up
yourAttlOO2
amplifierfor running itin BRIDGE mode.
Whilst the amplifier is off,
1. connedthe signal sourcelothe Channel-Afemale
inputXLR.
2. Loop from Channel-A male XLR to Channel-B fe-
male
inputXLRwith
a Reverse
Phase Lead.
A reverse Phase Lead
is
wired:
qlannel-A qlannel-B
Pin-1 to Pin-l
Pin-2 to Hn-3
Pin-3 to Pin-2
3. Connect
your
load between the red binding
post
output terminals, where the
positive
side of the
load is connected
tothe Channel-A output andthe
negative side of the load
goes
to the Channel-B
output
. There are no furtherconnections requ ired.
4. Tum
the ettenuators on both channels fully clock-
wise
(0dB
- no attenuetion).
You can also source the output from the
channel-A
SPEAKON
output connector where Channel-A will
be onthe
pin
marked 1+ and ChanneFB will be on the
pin
marked
2+.
NOTE: You should check aftermarket manufactured
Speakon
interconnecting speaker leads before
connecting them to
your
amplifier. Some leads
are
manufactured for specific
purposes,
or specific use,
and
may have
pinsshorted
insidethe connector. Any
speakon lead with shorted
pins
will obviously short
the output of
your
amplifier
(either
to
ground,
or
oulput lo
output
-
be careful).
NEVEFgE PRASt LEAO
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Figure
6 Bridge Mode Speaker Connection
Australian Monitor
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