Bridged Mode - Samson 1200 Owner's Manual

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).
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!
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
CHANNEL
1(+) OUTPUT
CHANNEL
2(+) OUTPUT
9

Bridged Mode

MODE SELECTOR
BRIDGED STEREO
Bridged / Stereo switch
OUTPUT
CHANNEL 2 CHANNEL 1
MINIMUM LOAD IMPEDANCE
- + +
STEREO
(4 /CHANNEL)
BRIDGED MONO
-
+
(8 )
Bridged Mode
INPUT
-