1
947602
CAUTION: To reduce the risk of electric shock,
Do not remove cover.
No user serviceable parts inside.
Refer servicing to qualified service personnel.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol indicates that dangerous
voltage constituting a risk of electric
shock is present within this unit.
This symbol indicates that there are
important operating and maintenance
instructions in the literature accompanying
this unit.
Issue 4
SM120
RACK MOUNT 120 WATT AMPLIFIER
INTRODUCTION
These instructions contain the specifications and
information necessary to install, operate and
maintain the SM120, 120 Watt Mixer-Amplifier.
The SM120 provides up to 120 Watts of audio
power for voice paging or background music
systems.
SPECIFICATIONS
Access Methods
Paging and Sound Reinforcement Systems
Stand Alone Background Music Systems
Features
Active mix or Priority override on inputs
(override is voice operated)
Rack Mount
Mic 1/Tel on Input 1, plus 3 standard
MIC/AUX inputs
Volume control for each input
Master Volume, Bass and Treble Controls
Overload limiting circuit protection
Screw terminals for all connections
Power "ON" indicator
Clipping and Fault indicators
8 Ohm, 25 and 70 Volt selectable output
Tone generator (Warble or Continuous)
Optional external volume control
Dimensions and Weight
17.0" W x 12.0" D x 1.75" H
(43.23cm W x 30.5cm D x 4.4cm H)
Weight: 5.1 lbs. (2.3 kg)
Nominal Specifications
Wattage Output
120 Watts Peak
Type Outputs 8 Ohm or 25V or 70V
Frequency Response 20 to 20kHz +/-2dBm
Distortion
< 2% @ 1kHz Rated Output
Number of Inputs
4 (1 Mic/Tel Line,
3 Mic/Aux)
Voice Switch Sensitivity 31dBm
Mic Input Impedance 600 Ohms Balanced
Mic Input Sensitivity
1.0mVRMS
Tel Line Input Impedance
600 Ohms
Tel Line Sensitivity
70mVRMS
Aux Input Impedance
10K Ohms
Aux Input Sensitivity 200mVRMS
Line Out Impedance 10K Ohms
Line Out Level 1VRMS
Nominal Power Requirements
Input Voltage: 85-265VAC
Current @ 120VAC: 0.28A Typical
Environment
Temperature 0 to +40° C +32° to +104° F
Humidity
0 to 85% non-precipitating
Precautionary Designations
WARNING-To Reduce The Risk Of Fire Or
Electric Shock. Do Not Expose This
Apparatus To Rain Or Moisture.
• AVERTISSEMENT - Afin de réduire les
risques d'incendie ou de décharge
électrique, évitez d'exposer le système à
la pluie ou à l'humidité.
• Apparatus shall not be exposed to
dripping or splashing and no objects filled
with liquids, such as vases, shall be
placed on the apparatus.
• L’appareil ne doit pas être exposé à des
égouttements et éclaboussures et aucun
Objet Rempli de liquide, comme vase, ne
doit être place
sur l’appareil.
