S E RV O S T U 1 2 0 D I O AMPLIFIER OWNERS MANUAL ®
Introduction 3 Servo 120 Features 4 Guided Tour 5 Front Panel 5 Rear Panel 6 Setting Up and Using the Servo 120 Amplifier 7 The Servo 120 Protection Circuitry 8 Bridge Mode 9 Appendix A: Linearity vs. Frequency Sweep 10 Appendix B: Power Output vs.
Introduction Congratulations on purchasing the Samson Servo 120 Power Amplifier! Although designed for easy operation, we suggest you first take some time to go through these pages so you can fully understand how we’ve implemented a number of unique features. The Servo 120 is a single rack-space stereo power amplifier which is optimized for use in both professional and project recording studio environments as well as for live performance.
Servo 120 Features The Samson Servo 120 Power Amplifier utilizes the latest technology in professional power amplifier design. Here are some of its main features: • Power to spare - Each channel delivers 60 watts of power into 4 ohms (or, in Bridge mode, 120 watts into 8 ohms). • Clean, crisp sound - Impressive audio specifications such as .01% THD, S/N of 105 dB, crosstalk of 75 dB, and frequency response of 3 Hz to 65 kHz guarantee ultra-clean sound quality in any live or recording environment.
Guided Tour - Front Panel 7 8 3 4 -6 50 -10 30 -16 15 SAMSON PROTECTION SERVO 120 STEREO AMPLIFIER SPEAKER POWER 50 -6 30 -10 15 -16 -35 -30 -4 5 -40 -55 -5 0 -3 -60 0dB 70 5 -6 -4 5 -55 -5 0 100% 70 -15 -1 0 -15 -1 0 -60 100% -3 -20 0dB 5 -2 -20 -5 0dB 5 -6 6 -30 5 -2 LEVEL 2 5 -70 -35 1 LEVEL 0dB -40 4 -5 3 -70 1: Power switch - Use this to power the Servo120 on or off. 2: Power LED - Lit whenever the Servo 120 is powered on.
Guided Tour - Rear Panel 3 2 1 4 M0N0 AC INPUT BALANCE FUS E E SERVO 120 STEREO AMPLIFIER ON LEFT RIGHT USA & CANADA 115V~60HZ 200W EUROPE & UK 230V ~ 50HZ 300W USA & CANADA 2.5A/125V (115V) EUROPE & UK 1.5A/250V (230V) FUS OFF SAMSON BALANCE BRIDGE CAUTION +RIGHT - 5 GROUND MONO (8Ω) LEFT+ + RISK OF ELECTRIC SHOCK DO NOT OPEN 6 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.
Setting Up and Using the Servo 120 Power Amplifier Setting up your Servo 120 is a simple procedure which takes only a few minutes: 1. Remove all packing materials (save them in case of need for future service) and decide where the amplifier is to be physically placed—it can be used free-standing or mounted in a standard 19" rack, requiring only one rack space.
The Servo 120 Protection Circuitry As noted in the “Guided Tour” section of this manual, the Servo 120's front panel Protection LED indicates the activity of the relay speaker connection circuitry. When the Protection LED is lit, this circuitry is inactive, and all connected speakers are muted (provided with 0 volts DC), thus protecting them and preventing any audible “thump” from occurring.
Bridge Mode BRIDGE OFF ON The Servo 120 provides a rear-panel switch that allows it to be used in a Bridge mode. When this switch is placed in the “Off” (left) position, the Servo 120 functions as a true stereo amplifier, where both of the two independent amplifier channels (left and right) can receive different input signals and produce independent output signals.
Appendix A: Linearity vs. Frequency Sweep AUDIO PRECISION Servo 120 LEVEL (dBr) vs FREQ (Hz) 0dB ref 5.0000 Ap 4.0000 3.0000 2.0000 1.0000 0.0 -1.000 -2.000 -3.000 -4.000 -5.000 10 100 1k Linearity (0 dB Ref) vs.
Appendix B: Power Output vs. THD AUDIO PRECISION Servo 120 THD +N (%) & LEVEL (W) vs FREQ (Hz) Watts THD 1.000 80.000 Ap .9000 73.000 61.000 .8000 56.000 .7000 48.000 .6000 40.000 .5000 32.000 .4000 21.000 .3000 15.000 .2000 8.000 .1000 200.0u 20 0.000 100 1k 10k Power output (60 W) vs.
Specifications 1. Rated Output Power, per channel (@ 1 kHz) Stereo mode 4 ohm, .<0.05% THD+N 4 ohm, 1% THD+N 8 ohm, <0.05% THD+N 8 ohm, 1% THD+N Bridge mode 8 ohm, .<0.05% THD+N 8 ohm, 1% THD+N 60 W 80 W 50 W 55 W 120 W 150 W 2. Typical Distortion, per channel THD+N (80 kHz LPF @ 1 kHz, rated output power) IMD (SMPTE 4:1, 60 Hz & 7 kHz @ rated output power) .01% .03% 3. Signal To Noise Ratio (22 Hz - 22 kHz bandwidth @ dB below rated output power) 4. Frequency Response 5.
Produced by On The Right Wavelength for Samson Technologies Corp. Copyright 1997, Samson Technologies Corp. Printed June, 1997 Samson Technologies Corp. 575 Underhill Blvd. P.O.
