Samson Servo 120a - 1U stereo power amplifier with 2x50 W at 8 Ω, 2x60 W at 4 Ω and front headphone output

Samson Servo 120a - 1U stereo power amplifier with 2x50 W at 8 Ω, 2x60 W at 4 Ω and front headphone output

The Samson Servo 120a is a 2-channel power amplifier in a 19” (1U) rack format designed to deliver reference audio with quiet operation. It delivers 50 W per channel into 8 Ω and 60 W per channel into 4 Ω , with independent level controls on the front, LED indicators for signal presence and clip , and a convenient 1/4” headphone output for quiet monitoring. It incorporates RCA (-10 dBV) and balanced 1/4” TRS jack (+4 dBu) inputs, and the output to the speakers is via binding posts , compatible with bare wire or banana plugs . Its architecture with a toroidal transformer and convection cooling (fanless) guarantees low noise and continuous reliability in the studio, installations and light sound reinforcement. In addition, it offers 8 Ω bridge mode to concentrate the power in a single channel when the project requires it.

Main features

• Power : 2×50 W at 8 Ω; 2×60 W at 4 Ω; 120 W at 8 Ω in bridge mode .
• Control and monitoring : independent L/R levels , Signal and Clip LEDs.
• Front headphone output (6.35 mm) with speaker switching for private listening.
• Input connectivity : RCA -10 dBV and balanced 6.35 mm TRS jack +4 dBu .
• Speaker outputs : 5-way binding posts (bare wire or banana plugs).
• Reference audio : response 10 Hz–20 kHz (+0/−0.5 dB) , SNR 105 dB , THD+N typical 0.01% , crosstalk −75 dB .
• Silent design : fanless (convection) and toroidal transformer .
• Format : 1U rack, 444 × 292 × 44 mm , weight 7 kg .

Product benefits

• Cabin silence : Convection cooling eliminates fan noise in control and home studios .
• Easy integration : Accepts consumer (RCA -10 dBV) and professional (TRS +4 dBu) levels without special adapters.
• Flexible monitoring : listen through headphones from the front and mute the displays with the dedicated switch.
• Versatile : Stereo use for passive monitors or bridge at 8 Ω for a single load with more power.

Use cases

• Studio and home studio : passive near-field monitors with flat response and low noise.
• Fixed installation : classrooms, retail, meeting rooms and cultural spaces.
• Compact sound reinforcement : lightweight racks for conferences and corporate events.

Description for projects

1U/19” stereo power amplifier with 2×60 W/4 Ω , 2×50 W/8 Ω and 120 W/8 Ω bridged ; RCA (−10 dBV) and balanced 6.35 mm TRS (+4 dBu) inputs ; binding post outputs ; 6.35 mm headphone output with speaker mute ; response 10 Hz–20 kHz (+0/−0.5 dB) , SNR 105 dB , THD+N 0.01 % , crosstalk −75 dB ; bi-polar design with toroidal transformer and convection cooling . Dimensions 444 × 292 × 44 mm; weight 7 kg.