The Servo 4120 power amplifier is designed for use in recording studios, live performance, distributed sound and other permanent installations. This 2-space rackmount quad power amplifier delivers 120 watts per channel into a 4 ohm load (in mono bridge mode, 240 watts into 8 ohms per pair), over a bandwidth of 20 Hz to 50 kHz. The four 120 watt amplifiers can be bridged separately to provide two 240 watt amps or one 240 watt amp and two 120 watt amps. The 4120 features high-current output power transistors and a unique bipolar circuit design that continuously keeps DC output during idling at or near 0 volts. It also includes balanced 1/4″ and RCA inputs and binding post outputs, 2 front-panel protection LEDs, four separate volume controls with LED indicators and thermal and overcurrent protection circuitry. The amp is also equipped with special insulated caps and a protective covering over the output connectors consistent with the new UL standard. The Servo 4120 is convection cooled for silent operation, without fan noise or need for filter maintenance.
Rack-mount quad power amplifier (2-space).
120 watts per channel into 4 ohms (quad).
240 watts into 8 ohms (mono bridge per pair).
20 Hz to 50 kHz frequency response.
Balanced 1/4″ and unbalanced RCA inputs.
Binding post outputs.
Turn-on muting to prevent speaker “thumps.”
Smart servo circuitry protection against overheating and overcurrent.
High-current output power transistors.
Unique bipolar circuit design continuously keeps DC output during idling at or near 0 V (thus keeping idle speakers at their 0 point).
Two front-panel protection LEDs, with LED indicators.
Four independent volume controls with LED meters.
New UL standard insulated caps and protective cover over output connectors.
Convection cooled (No Fan).
All-steel chassis with lightweight anodized aluminum heat sink
Output Power (typical all channels driven):
4 Ω, 1 kHz, 1% THD, 86 W 4 Ω, 1 kHz, .0072% THD, 60 W 8 Ω, 1 kHz, 1% THD, 57 W 8 Ω, 1 kHz, .0046% THD, 47 W 8 Ω bridged, 1 kHz, 1% THD, 171 W 8 Ω bridged, 1 kHz, < .013% THD, 142 W
Frequency Response (-3 dB): <10 Hz to 85 kHz
Frequency Response (1 watt): 20 Hz to 20 kHz, -0/-.2
Crosstalk (adj. channels): -82 dB, 1 kHz @ rated output
Distortion (THD+N, 20 Hz to 20 kHz) (80 kHz LPF):
at rated power: < .08%
at 1 watt: < .05%
Sensitivity (level control at maximum): +4 dBu
Damping Factor (8 Ω): > 180
Dynamic Range: 80 dB below rated output (20 Hz to 22 kHz B.P.F.)
Input Impedance: >10 k Ω balanced/> 10 k Ω unbalanced
Power Consumption: 360 W @ 120 V/60 Hz 395 W @ 220 V/50 Hz
Dimensions: 17.5” (w) x 3.25” (h) x 10.75” (d) 444 mm (w) x 82.5 mm (h) x 273 mm (d)
Weight: 25 lb / 11.3 kg
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