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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.

• Independent input level controls for each channel with 41-position detents.

• Five-segment LED meters for each channel continuously display power output levels and allow you

to correct for overloading (clipping) conditions.

• Front-panel Protection LED shows you at a glance overheating or faulty wiring conditions.

• Innovative front-panel Speaker on/off switch and dedicated headphone jack enables private cue

monitoring of the input signal.

• Both electronically balanced 1/4" TRS and unbalanced RCA-type input connector jacks are provided,

along with push-spring terminal output connectors.

• Convection cooling (no fan) makes for whisper-quiet operation even in critical listening environments

such as recording studios.

• Unique bipolar circuit design that continuously keeps DC output during idling at or near 0 volts (thus

keeping idle speakers at their 0 point).  This serves to minimize heat overload problems by effectively
preventing the Servo 120 from applying power when unnecessary.

• Protection relay circuitry (linked to the DC offset circuitry) that prevents “thumps” when powering on

or off.  This means that you can use the Servo 120 with a single power strip into which a mixer or
other audio devices are connected, without danger of damage to connected speakers.

• Toroidal transformer power supply.

• Rugged construction (an all-steel chassis with a titanium finish and a lightweight anodized aluminum

heat sink) makes the Servo 120 eminently roadworthy.

• Flexible design allows the Servo 120 to be used free-standing or, with the use of included rack ears,

mounted in any standard 19" rack (taking just a single rack space).

• Three-year warranty.

• Last but certainly not least, value.  The Samson Servo 120 has been designed from the ground up to

deliver excellent yet affordable sound quality.

Summary of Contents for Power Amplifier Servo 120

Page 1: ... OWNERS MANUAL S T U D I O AMPLIFIER S E R V O 1 2 0 ...

Page 2: ...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 THD 11 Specifications 12 ...

Page 3: ...dio experience in your own home try connecting your home hi fi amplifier s auxiliary outputs to the Servo 120 s inputs thus using your hi fi amp as a preamplifier and then connect your existing speakers to the Servo 120 s outputs If you fall in love with the sound as we re sure you will you might want to substitute a professional pre amplifier for your existing hi fi amp and from there you may wel...

Page 4: ...h push spring terminal output connectors Convection cooling no fan makes for whisper quiet operation even in critical listening environments such as recording studios Unique bipolar circuit design that continuously keeps DC output during idling at or near 0 volts thus keeping idle speakers at their 0 point This serves to minimize heat overload problems by effectively preventing the Servo 120 from ...

Page 5: ...n on page 7 in this manual for more information 5 Protection LED This goes on for approximately five seconds whenever the Servo120 is powered on and fades slowly when the amp is powered off When lit 0 volts DC are provided to all connected speakers thus muting them and preventing any thump from occurring For a complete description of the conditions under which this light goes on see the section en...

Page 6: ... 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 lef...

Page 7: ... the same power strip that other audio devices such as a mixing console are connected to You can then turn on all devices at once with the single power strip on off switch with no danger of damaging connected speakers by generating thumps 6 Press the front panel Speaker on off switch so that it is in in its down position and then press the front panel Power switch in order to turn on the Servo 120...

Page 8: ...o guard against this problem make sure the Servo 120 receives adequate ventilation on all sides see page 5 for more information in extreme environmental conditions you may also want to consider the use of cooling fans Severe overcurrent conditions This occurs whenever the signal being input to the Servo 120 rises to a level above 20 THD Total Harmonic Distortion Shorted speaker cables This will oc...

Page 9: ...d is thus doubled so that the power output is doubled When using the Servo 120 in Bridge 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 the left channel connected to the positive input of the speaker and the red terminal of the right channel connected to the negative input of the speaker Do not use the blac...

Page 10: ...ty vs Frequency Sweep 10 Linearity 0 dB Ref vs frequency sweep 10 Hz 50 kHz 5 0000 4 0000 3 0000 2 0000 1 0000 0 0 1 000 2 000 3 000 4 000 5 000 10 100 1k 10k 50k Ap AUDIO PRECISION Servo 120 LEVEL dBr vs FREQ Hz 0dB ref ...

Page 11: ...60 W vs Total Harmonic Distortion 80 000 73 000 61 000 56 000 48 000 40 000 32 000 21 000 15 000 8 000 200 0u 0 000 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 000 20 100 1k 10k 50k Ap AUDIO PRECISION Servo 120 THD N LEVEL W vs FREQ Hz THD Watts ...

Page 12: ...z 7 kHz rated output power 03 3 Signal To Noise Ratio 22 Hz 22 kHz bandwidth dB below rated output power 105 dB 4 Frequency Response 10 Hz 20 kHz 0 0 5 dB 3 Hz 65 kHz 0 3 0 dB 5 Input Sensitivity 4 dBu to achieve rated power Level control set to maximum 6 Crosstalk adjacent channels 75 dB 1 kHz 7 Output DC Offset Voltage 50 mV DC Servo Controlled 8 Headphone Output Level 15 mW into 8 Ω 1 THD N 9 D...

Page 13: ...avelength for Samson Technologies Corp Copyright 1997 Samson Technologies Corp Printed June 1997 Samson Technologies Corp 575 Underhill Blvd P O Box 9031 Syosset NY 11791 9031 Phone 1 800 3 SAMSON 1 800 372 6766 Fax 516 364 3888 ...

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