ARC Audio FD1200.1 Owner's Manual - Page 4

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Bridging
Bridging is a way to combine the power of 2 channels into 1. When
you wire the amp bridged you have a higher voltage differential
between + and -. That means MORE POWER.
If you have 2 identical, properly designed mono amplifiers (They can
not be a stereo amp that is bridged internally) you can bridge them
together to create 1 channel.
1.
Run a jumper wire
between the negative (-)
speaker output of the 2
amps. Use the same
gauge speaker wire you
used to connect the
speaker.
2.
Run a speaker wire
from amplifier 1
(Normal) positive (+)
output to the woofer +.
3.
Run a speaker wire
from amplifier 2
(Slave) positive (+)
output to the woofer -.
When you are finished it should
look like this.
Warning
When bridging any amp or amps, each channel sees half the ohm load. 4 ohms bridged is the
same as 2 ohms stereo. 1 ohm bridged is equal to 1/2 ohm stereo. Check the compatibility of
you woofers and amplifier before you begin.
6
1
1
+
MIN
MIN
+
1
1
+
MIN
-
+
MIN
-
-
4 0HMS
+
1
1
MIN
+
MIN
-
+
-
-
4 0HMS
+
1
1
+
MIN
-
+
MIN
-
-
4 0HMS
+
Bridging Cont.
For bridging to work both amplifiers must be playing exactly the same
signal at exactly the same output level. To make this easier we have
added a "Slave In" and "Slave Out" to this amp. When you use the Slave In
all the gain and crossovers are bypassed. This eliminates all the compli-
cateted tuning needed to match each amp.
When bridging 2 amp, 1 amp will act as the positive output and the
other will act as the negative output. The negative amp will need to play
"out of phase" from the postive amp. Imagine it like this. The positive
amp is pushing the woofer and the negative amp is pulling. You can do
this by changing the "Phase" switch to "OUT"
Please see the switch setting below.
Amp 1(NORMAL)
Set the load switch to the
correct location for your
woofers.
4 ohm bridged set to TWO
2 ohm bridged set to ONE
Set the phase to "IN"
Run a mono RCA cable to
"SLAVE OUT"
XOVER
LOAD
INPUT
PHASE
FRE Q Hz
SELECT
SOURCE
SLAV E IN
INPUT
30
< IN
< ONE
< SLAVE
OU T >
TWO >
NORMA L >
L
250
OHM
L
R
-
+
-
+
MIN
R
SPEAKER
MAX
LEVE L IN
GAIN
.4V - 12.2V
SLAV E OUT
XOVER
LOAD
INPUT
PHASE
FRE Q Hz
SELECT
SOURCE
SLAV E IN
INPUT
30
< IN
< ONE
< SLAVE
OU T >
TWO >
NORMA L >
L
OHM
250
L
R
+
-
+
-
MIN
R
SPEAKER
MAX
LEVE L IN
GAIN
.4V - 12.2V
SLAV E OUT
Amp 2 (SLAVE)
Set the load switch to the
correct location for your
woofers.
4 ohm bridged set to TWO
2 ohm bridged set to ONE
Set the phase to "OUT"
Run a mono RCA cable to
"SLAVE IN"
7