6
7
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
b 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 .
3.
Run a speaker wire
from amplifier 2
(Slave) positive (+)
output to the woofer -.
When you are finished it should
look like this.
1
MIN
1
MIN
+
+
1
MIN
1
MIN
4 0HMS
+
-
+
-
+
-
1
MIN
1
MIN
4 0HMS
+
-
+
-
+
-
1
MIN
1
MIN
4 0HMS
+
-
+
-
+
-
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.
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”
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”
30
250
+
-
-
L
R
SPEAKER
LEVE L IN
GAIN
L
R
INPUT
XOVER
FRE Q Hz
MIN
MAX
+
SLAV E IN
SLAV E OUT
INPUT
SOURCE
< SLAVE
NORMA L >
PHASE
< IN
OUT >
.4V - 12.2V
< ONE
TWO >
LOAD
SELECT
OHM
30
250
+
-
-
L
R
SPEAKER
LEVE L IN
GAIN
L
R
INPUT
XOVER
FRE Q Hz
MIN
MAX
+
SLAV E IN
SLAV E OUT
INPUT
SOURCE
< SLAVE
NORMA L >
PHASE
< IN
OUT >
.4V - 12.2V
< ONE
TWO >
LOAD
SELECT
OHM
Summary of Contents for FD1200.1
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