Adastra RS121 120 W Class‑D 100 V Rack‑Mount Slave Amplifier

Adastra
443-201
5015972232774
    Delivery time:2 - 3 Working Days
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  • Description
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  • Specifications

Mono 120 Watt Slave Amplifier.

100V line or 8 Ohms operation.

Balanced Input (Screw Terminals) and 2 x L+R RCA Sockets.

100V input for connection in parallel with existing 100V speakers.

Channel Gain Control.

LED Signal Indication.

24V fire alarm mute contacts.

Supplied with hardware for rack-mounting 2 units

2 x L+R RCA Slave Output.

The Adastra RS121 is a compact 120 W RMS Class‑D slave amplifier built into a 1U 19″ rack chassis. Designed for 100 V speaker line installations, it also supports low‑impedance down to 2 Ω—perfect for feeding multiple distributed speakers or standard PA units

Featuring RCA and Euroblock stereo line‑inputs, plus a 100 V line input and output for cascading additional amplifiers or picking up existing feeds, it delivers seamless audio expansion. A handy 24 V alarm mute terminal enables audio shutdown during emergency alerts

Compact yet robust, the RS121 weighs just 4.8 kg, making it easy to install in tight rack spaces—ideal for commercial environments that demand reliable distributed audio amplification.


  • Background-music PA systems in retail outlets, hotels, places of Worship, restaurants and conference facilities—where 100 V lines simplify wiring and zone control

  • Expansion of existing 100 V speaker networks, enabling additional speakers or racks using simple cable runs and cascade chaining

  • Alarm and emergency integration—via the dedicated mute contact, it's compatible with security panels for automatic muting during alerts

The Adastra RS121 is a 120W Class-D slave amplifier designed for expanding 100V line or low-impedance audio systems. With versatile input options, including RCA and screw terminals, and a 1U rack-mountable design, it's ideal for commercial installations requiring reliable and scalable audio amplification.

The Adastra RS121 is engineered for commercial environments requiring reliable and scalable audio amplification. Its 120W output power and compatibility with both 100V line and low-impedance speaker systems make it suitable for venues such as retail stores, educational institutions, conference centers, and public address systems. The amplifier's 1U rack-mountable design allows for seamless integration into standard equipment racks, and its versatile input options—including RCA and screw terminals—enable it to be easily connected to existing mixer amplifiers or extended speaker lines. Additionally, the RS121 features a 24V mute contact for integration with emergency systems, ensuring compliance with safety protocols in public address applications.

Power Supply: 170-264Vac, 50Hz (IEC)
Power (RMS):

120 Watts

Line input:

Line (RCA)

Line Sensitivity:

-10dB (line)

Signal to Noise Ratio (SNR):

80dB

Total Harmonic Distortion (THD): <0.04%
Dimensions: 433 x 267 x 44mm
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