Table of Contents Introduction Servo 120a Features Guided Tour Front Panel Rear Panel Setting Up and Using the Servo 120a Amplifier The Servo 120a Protection Circuitry Bridge Mode Appendix A: Linearity vs. Frequency Sweep Appendix B: Power Output vs.THD Specifications Copyright 2004, Samson Technologies Corp.
120a the perfect complement to any recording studio. • Home Theatre applications - The power and flexibility offered by the Servo 120a (it can be used either as a 60 watt stereo amplifier, or, in bridge mode, as a 120 watt monophonic amp) makes it the perfect addition to any home theatre, in conjunction with any DVD player or other surround sound system.
• 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 120a with a single power strip into which a mixer or other audio devices are connected, without danger of damage to connected speakers.
5: Power switch - Use this to power the Servo120 on or off. 6: Speaker on/off LED - Lights when the Speaker on/off switch (see #6 above) is pressed in and the Servo 120a is delivering signal to its rear panel output terminals (see #7 on the following page).
Stereo signals should be con- nected to both the left and right input jacks; when operating the Servo 120a in Bridge mode, use the left input jack only (see page 10 in this manual for more information).
Speaker LED (in the Speaker on/off switch) will light instead (you’ll hear a click when this occurs). 7. Apply an input signal to the Servo 120a at or about +4 dBu (if sending signal from a mixer, Protection LED drive the output meters at approximately 0 vu).
Servo 120a short to one another. • Output impedance drops below 2 ohms: This can occur if the Servo 120a is con- nected to inappropriate speaker systems (see the “Setting Up and Using the Servo 120a”...
RIGHT(+) OUTPUT The Servo 120a provides a rear-panel switch that allows it to be used in a Bridge mode. When this switch is placed in the “RIGHT” (Stereo) position, the Servo 120a 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.
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