6
Guided Tour - Rear Panel
1: AC input - Connect the supplied standard 3-pin “IEC” plug here.
2: Fuse holder - In the Servo Quad 4060, insert an 6 amp, 125 volt fuse here for 115 volt operation, or
a 3.15 amp, 250 volt fuse for 230 volt operation. In the Servo Quad 4120, insert an 8 amp, 125 volt fuse
here for 115 volt operation, or a 6.3 amp, 250 volt fuse for 230 volt operation. We recommend the use
of normal (as opposed to slow-blow) fuses. WARNING: Fuses should only be replaced with the power
cord disconnected.
3: Binding post (banana jack) output connectors (Ch 1 - 4) - Use these to connect each channel of
the Servo Quad Amplifier to loudspeakers. Be sure to connect the loudspeaker correctly, with the red
(+) terminal normally connected to the positive input of the speaker and the black (-) terminal normally
connected to the negative input of the speaker. See the “Bridge Stereo Mode” section on page 7 in this
manual for speaker connection instructions when using the Servo Quad Amplifier in bridge mode.
4: Balanced Inputs* (Ch 1 - 4) - Connect incoming signal to these electronically balanced 1/4" TRS
(Tip/Ring/Sleeve) jacks, wired as follows: Tip hot, Ring cold, and Sleeve ground. Use balanced three-
conductor cabling and TRS plugs wherever possible (unbalanced two-conductor plugs can also be
inserted into these inputs, but you’ll get better signal quality and less outside noise and hum if you
use balanced lines). Note that the Servo Quad Amplifier balanced inputs are 6 dB higher in gain than
the balanced inputs (see #5 below). The Servo Quad Amplifier accepts input levels of any strength but
needs at least 0 dBm to get maximum power.
5: Unbalanced Inputs* (Ch 1 - 4) - Connect incoming signal to these unbalanced RCA-type jacks.
The Servo Quad Amplifier accepts input levels of any strength but needs at least 0 dBm to achieve
maximum power. Note that the Servo Quad Amplifier unbalanced inputs are 6 dB lower in gain than the
balanced inputs (see #4 above).
6: Bridge switch - For normal operation, place this switch at its left (“OFF”) position. When placed at its
right (“ON”) position, each of the two amplifier sections (channel 1 and channel 2 and/or channel 3 and
channel 4) are bridged, providing full 120 or 240 watt power output, depending upon the Servo Quad
model you’re using. For more information, see the “Bridge Stereo Mode” section on page 7 in this
manual. WARNING: Due to the extremely high power output of the Servo Quad Amplifier when used in
Bridge Stereo mode, be sure to use only 8 ohm loudspeakers sufficiently rated to handle the resultant
wattage.
* If required, both the balanced and unbalanced inputs can be used simultaneously.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
!
USE CLASS 2 WIRING
AVIS;
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE.
emc
EUR . USA . JPN
BRIDGE
OFF
ON
CH4 R
CH3 R
CH4
CH3
4
Ω
120W
MAX. LOAD
-
+
+
-
CH2 L
CH1 L
-
+
+
-
BRIDGE
OFF
ON
SAMSON
SERIAL NUMBER
SERVO 4120
QUAD AMPLIFIER
SAMSON TECHNOLOGIES CORP., U.S.A.
AC
INLET
USA & CANADA 115V - 60Hz
EUROPE & UK 230V - 50Hz
650W MAX.
CAUTION:
DISCONNECT SUPPLY CORD
BEFORE CHANGING FUSE.
FOR CONTINUED PROTECTION
AGAINST RISK OF FIRE, REPLACE
ONLY WITH SAME TYPE OF FUSE.
ATTENTION:
DEBRANCHER AVANT DE
REMPLACER LE FUSIBLE.
UTILISERUN FUSIBLE DE
RECHANGE DE MEM TYPE.
USA & CANADA
T 8A/125V (115V)
EUROPE AND UK
T 6.3A/250V (230V)
FUSE
2
3
1
3
4
5
4
5
6
6
-
+
+
-
MONO 8
Ω
-
+
CH2
CH1
4
Ω
120W
MAX. LOAD
-
+
+
-
MONO 8
Ω
-
+
