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.
ChannelA
is
used
asthe
"dominant',
channel
and
its
output
is
in
phase
with the
input
signal,
and
channel
B
has its
phase
reversed
so it
is
exacily
1g0o
out of
phase
with
the
input
signal.
As two
amplifiers
with
a
phase
difierence
of
1gS
are
now
driving
the
load
you
will
now
have
double
the
voltage
into
the load.
This
means
you
will
now
have
four
times
the
porcr
into
that
load.
The
output
can
now
be
considered
as
an
active
balanced
output.
Acommon
useof
an amplifier
in
BRIDGE
mode isfor
driving
70volt&
l00voltdistribution
tines.
ln BRTDGE
mode,
The
Pthzo
can
produce
over
100
volts
with
line
impedances
over
8 ohms
whilst
the
&Qao can
produce
over
84
volts
with
line
impedances
over
g
ohms.
Equally
the
units
can
be
used
in
bridge
mode
to
provide
the
correct
voltage/power
requirements
for
an
applicable
load.
As
shown
in
Figure
6, there
are
three
steps
in setting
up
y
our
Piau/Pirzu
am
p
I if i
er for
ru nn
i
n
g
it
i n B
R I D
GE
mode.
Whilst
the
amptifier
is
ofi
1
.
Connect
the
signal source
to
the
Channel-Afemale
input
XLR.
The
Channel-A
attenuator
becomes
the level
controlfor
both
channels.
2.
Engage
the
"push
to bridge"
switch.
3.
Connect
your
load
between
the red
binding
post
output
terminals,
where
the
positive
side
of
the
load
is
connected
to
lhe channel
A output (marked
BRIDGE+)
andthe
negativesideof
the
loadgoes
to
the
channel
B
output
(marked
BRIDGE-).
There
are
no
further
connections
required.
You
can
also
source
the output
from
the
Channel-A
SPEAKON
output
connector
where
Channel-A
will
be on
the
pin
marked
1
+
and
Channel-B
will be
on
the
pin
marked
2+.
NOTE:
You
should
check
after
market
manufactured
Speakon
interconnecting
speaker
leads
before
connecting
them
to
your
amplifier.
Some
leads
are
manufactured
for
specific
purposes,
or
specific
use,
and
may
have
pins
shorted
inside
the connector.
Any
speakon
lead
with
shorted
pins
willobviously
short
the
output
of
your
amplifier
(either
to
ground,
or
output
to
output
-
be
careful)
Figure
6
Bidge
Mode
Speaker
Connection
Fiox
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souecc
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Australian
Monitor
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