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Servo 120a

Power Amplifier

Ideal for powering near-field monitors or installation sound, the new Servo 120a delivers "reference-class" audio performance and reliability in a compact package. This single-space rackmount stereo power amplifier delivers 60 watts per channel into 4 ohms, or 120 watts into 8 ohms in bridge mode. The intuitive front panel features controls and indicators including a power switch, independent left and right channel input level controls, 10-segment LED meters, a protection LED, and a convenient headphone jack and speaker on/off switch for private cue monitoring. Perfect for recording studios, sound reinforcement, stage monitoring, and home theater applications, the 120a's bipolar design and toroidal transformer power supply ensure reliability. The convection cooling design also means there is no fan, so you get incredibly quiet performance from this remarkable power amplifier. And with such versatility, the Servo 120a will provide seamless performance in any number of applications.

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Great for: Fitness, Theater / Production, Home Audio, Restaurant / Retail


  • Single-space 19-inch rackmount servo controlled power amplifier
  • 60 watts per side at 4 ohms stereo
  • 120 watts at 8 ohms bridged mono
  • 1/4-inch balanced phone jack and RCA inputs
  • Bi-polar design and toroidal transformer power supply
  • Individual left and right level controls
  • 10-segment, 3-color LED meters
  • Convection-cooled design
  • Headphone jack with speaker output mute


Stereo mode Rated Output Power, per channel (@ 1 kHz)
4 ohm <0.05% THD+N 60 W
4 ohm 1% THD+N 80 W
8 ohm <0.05% THD+N 50 W
8 ohm 1% THD+N 55 W
Bridge mode Rated Output Power (@ 1 kHz)
8 ohm <0.05% THD+N 120 W
8 ohm 1% THD+N 150 W
Typical Distortion, per channel
THD+N (80 kHz LPF @ 1 kHz, rated output power) 0.01%
IMD (SMPTE 4:1, 60 Hz & 7 kHz @ rated output power) 0.03%
Signal To Noise Ratio (22 Hz - 22 kHz bandwidth @ dB below rated output power) 105 dB
Frequency Response 10 Hz - 20 kHz +0, -0.5 dB, 3 Hz - 65 kHz, +0, -3.0 dB
Input Sensitivity (Level control set to maximum / Inputs to achieve rated power) RCA: -10 dBv, 1/4" +4 dBu
Crosstalk (adjacent channels) -75 dB, 1 kHz
Output DC Offset Voltage ± 50 mV, DC Servo Controlled
Headphone Output Level 400 mW (into 100 Ω @ 1% THD+N)
Dimensions 17.5" x 11.5" x 1.75" / 444mm x 292mm x 44mm
Weight 15.6lb / 7kg

Warning CALIFORNIA PROPOSITION 65 WARNING: Cancer and Reproductive Harm -

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