6
Guided Tour - Rear Panel
1: AC input - Connect the supplied standard 3-pin “IEC” plug here.
2: Fuse holder - Insert a 2.5 amp, 125 volt fuse here for 115 volt operation, or a 1.5 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: Bridge switch - For normal operation, place this switch at its left (“OFF”) position. When placed at
its right (“ON”) position, the two amplifier sections (the left and right channels) are bridged, providing full
120 watt power output into a single output. For more information, see the “Bridge Mode” section on
page 7 in this manual.
WARNING: Due to the extremely high power output of the Servo 120 when used
in Bridge mode, be sure to use only 8 ohm loudspeakers sufficiently rated to handle the resultant
wattage.
4: Balanced Inputs* - 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). Stereo signals should be connected to both the left and right input jacks; when
operating the Servo 120 in Bridge mode, use the left input jack only (see page 7 in this manual for more
information). The Servo 120 accepts input levels of any strength but needs at least +4 dBu to achieve
maximum power.
5: Unbalanced Inputs* - Connect incoming signal to these unbalanced RCA-type jacks. Stereo signals
should be connected to both the left and right input jacks; when using the Servo 120 in Bridge mode,
use the left input jack only (see page 7 in this manual for more information). The Servo 120 accepts
input levels of any strength but needs at least +4 dBu to achieve maximum power.
6: Push-spring terminal output connectors - Use these to connect each channel of the Servo 120
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 (ground) terminal normally connected to the
negative input of the speaker. See the “Bridge Mode” section on page 7 in this manual for speaker
connection instructions when using the Servo 120 in Bridge mode.
* If required, both the balanced and unbalanced inputs can be used simultaneously.
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