9
Bridged Mode
The F1200 / F800 provides a rear-panel switch that allows it to be used in either
a Stereo or Bridged mode. When this switch is placed in the “STEREO” (right)
position, the F1200 / F800 functions as a true stereo amplifier, where both of the
two independent amplifier channels (Channel 1 and Channel 2) can receive dif-
ferent input signals and produce independent output signals. However, when the
switch is placed in the “BRIDGED” (left) position, the Channel 1 inputs signal is
routed to both power amplifiers bridged together, producing a single output sig-
nal with a true 1200 watt output into a single 8 ohm channel (in the case of the
F1200) or a true 800 watt output into a single 8 ohm channel (in the case of the
F800).
The illustration on the right shows how this works. In Bridged mode, the polarity
(phase) of the Channel 2 output signal is reversed relative to that of the Channel
1 output signal. Both channels then process the same input signal, with the
speaker load connected so that power is derived from both channels. The effec-
tive voltage swing seen by the load is thus doubled, so that the power output is
doubled.
When using the F1200 / F800 in Bridged mode, be sure to connect your loud-
speaker as shown in the illustrations on page 10 and 11 (and as silkscreened on
the rear panel), with the red (+) terminal of the Channel 1 output connected to
the negative input of the speaker and the red (+) terminal of the Channel 2 out-
put connected to the positive input of the speaker. Do not use the black
ground (-) output terminal of either channel (the speaker load must “float”
away from the amplifier chassis).
See pages 10 in this manual for interconnection diagrams when using the F1200
/ F800 in Bridged mode
BRIDGED
STEREO
MODE SELECTOR
WARNING: Bridged mode is to be used only when the F1200 / F800 is con-
nected to an 8 ohm speaker load. Use of Bridged mode with speaker loads
of 4 ohms or less can result in severe damage to the unit due to excessive
heat and current limiting and will void your warranty!
INPUT
CHANNEL
1(+) OUTPUT
CHANNEL
2(+) OUTPUT
Bridged Mode
OUTPUT
CHANNEL 1
CHANNEL 2
MINIMUM LOAD IMPEDANCE
STEREO
(4
Ω
/CHANNEL)
BRIDGED MONO
(8
Ω
)
+
-
+
-
+
-
Bridged / Stereo switch