Bridge Stereo Mode
The Servo Quad Amplifier provides two rear-panel switches that allow it to be
used in a unique bridge stereo mode. When these switches are in their “Off”
(left) position, the Servo Quad Amplifier functions as a true quad amplifier, where
each of the four independent amplifier channels can receive different input signal
and produce independent output signal. However, when either switch is placed
in the “On” (right) position, the pair of amplifier channels (1/2 or 3/4) process only
the signal present at one input, thus producing a monophonic output signal with
a true 120 watt (in the case of the Servo Quad 4060 model) or 240 watt (in the
case of the Servo Quad 4120 model) output into 8 ohms. When both Bridge
switches are placed in the “On” position, the Servo Quad amplifier operates in
bridge stereo mode, acting like a true stereo amplifier, delivering 120 watts of
power per channel (in the case of the Servo Quad 4060 model) or 240 watts of
power per channel (in the case of the Servo Quad 4120 model).
The illustration on the left shows how this works. In bridge stereo mode, the
polarity (phase) of the channel 1 output signal is reversed relative to that of the
channel 2 output signal (similarly, the channel 4 output signal is reversed relative
to that of channel 3). Channels 1 and 2 then process the signal being input to
channel 2 (and channels 3 and 4 process the signal being input to channel 3),
but the speaker load is connected so that power is derived from both channels.
The effective voltage swing seen by the load is thus doubled so that the power
output is doubled.
When using the Servo Quad Amplifier in bridge stereo mode, be sure to connect
each loudspeaker as shown in the illustration below (and as silkscreened on the
rear panel), with the red (+) terminal of channel 2 (and/or channel 3) connected
to the positive input of the speaker and the red (+) terminal of channel 1
(and/or channel 4) connected to the negative input of the speaker.
Do not use the black (-) output terminal of either channel (the speaker load
must “float” away from the amplifier chassis).
9
TO RAIN OR MOISTURE.
EUR . USA . JPN
SAMSON TECHNOLOGIES CORP., U.S.A.
650W MAX.
BEFORE CHANGING FUSE.
ONLY WITH SAME TYPE OF FUSE.
REMPLACER LE FUSIBLE.
RECHANGE DE MEM TYPE.
MAX. LOAD
MAX. LOAD
