Adastra UA120 Compact 120W Mixer Amplifier 100V & 2 Ohm
DETAILS
The Adastra UA120 is a Compact 120W 1U Half-Rack Mixer Amplifier delivering 100V line and 2 Ohm operation with a built-in 5-channel mixer — the ideal space-saving solution for small to medium PA installations where versatility and a compact footprint are essential.
The Adastra UA120 has been designed as a versatile, space-efficient mixer amplifier for small to medium PA installations across offices, retail outlets, hospitality venues, educational facilities and other commercial environments. Its half-rack 1U chassis — measuring just 350 x 210 x 44mm — makes it one of the most compact 120W mixer amplifiers available, opening up a wide range of installation possibilities that a full-width unit simply cannot accommodate. Whether mounted below a counter, under a desk, fitted into a half-rack enclosure or rack-mounted alongside a second UA120 using the supplied rack-mounting hardware, the UA120 delivers full-featured mixer amplifier performance without demanding valuable space.
Versatile Inputs for Any Source
Despite its compact dimensions, the UA120 features a well-specified 5-channel input mixer to accommodate a wide variety of source connections. Three switchable mic/line inputs — one via a combo XLR/jack and two via 6.3mm jack — handle microphones and line-level sources with individual front panel volume controls for precise level management. An RCA line input and a 3.5mm aux input provide convenient connectivity for background music sources, streaming devices and other consumer audio equipment. A global 2-band EQ allows tonal adjustment of the overall output to suit the acoustic characteristics of the installation environment, whilst a master output control governs the overall system level.
100V Line & Low Impedance Operation
The UA120 supports both 100V line and 2 Ohm low impedance speaker operation via Euroblock screw terminals on the rear panel, making it compatible with a wide range of existing and new speaker installations. This dual-mode flexibility makes the UA120 an equally capable choice for distributed 100V line ceiling speaker systems and direct low impedance speaker setups — providing genuine versatility across a broad range of installation types and system configurations.
Professional Installation Features
The UA120 is equipped with a number of features specifically aimed at professional installation applications. Switchable +20V phantom power on channel 1 (available via XLR or rear terminals) accommodates condenser microphones and desktop paging microphones without the need for a separate power supply. A 24V fire alarm mute contact allows the amplifier to be integrated into a building's fire alarm system for automatic audio muting during an emergency — an important compliance feature for many commercial installations. Two RCA mono line outputs on the rear panel allow the signal to be looped through to additional amplifiers or zones, and the Class D amplifier with transformer output ensures efficient, reliable operation with low heat generation.
Adastra UA120 Key Features:
- 120W RMS Class D Amplifier: Efficient Class D amplification with transformer output for reliable, low-heat continuous operation.
- Half-Rack 1U Compact Chassis: Minimal footprint ideal for under-counter, under-desk, half-rack or dual rack-mount installations where space is at a premium.
- 5-Channel Input Mixer: 3 x switchable mic/line inputs (combo XLR + 2 x 6.3mm), 1 x RCA line input and 1 x 3.5mm aux input with individual channel volume controls.
- 100V Line & 2 Ohm Operation: Switchable between 100V line and 2 Ohm low impedance speaker outputs via rear Euroblock terminals for maximum system compatibility.
- Global 2-Band EQ: Overall tonal control to suit different room acoustics and installation environments.
- +20V Phantom Power on CH1: Switchable phantom power via XLR or rear terminals for condenser microphones and desktop paging microphones.
- 24V Fire Alarm Mute Contacts: Relay mute contacts for integration with building fire alarm systems for automatic audio muting in an emergency.
- 2 x RCA Mono Line Outputs: Loop-through outputs for connection to additional amplifiers or zones.
- Supplied with Rack-Mount Hardware: Includes hardware for rack-mounting two UA120 units side by side in a standard 19" rack enclosure, or for single unit wall or worktop mounting.
- Removable Euroblock Speaker Connector: Rear panel Euroblock terminals for clean, secure and professional speaker wiring.
SPECS & DOWNLOADS
Adastra UA120 Specifications:
- Output Power (RMS): 120W
- Amplifier Construction: Class D with transformer output
- Speaker Output: Euroblock terminals — 100V / 2 Ohm / Com
- Inputs: Mic/line combo (XLR/6.3mm), 2 x mic/line (6.3mm), line (RCA), aux (3.5mm)
- Phantom Power: +20V CH1 (XLR or rear terminals, switchable)
- Line Output: 2 x RCA (mono)
- Mute: 24V relay contacts (fire alarm mute)
- EQ: Global 2-band
- THD: < 0.4% at 1kHz
- Input Impedance: 1kΩ (mic/line)
- Input Sensitivity: -10dB (line) / -45dB (mic)
- SNR: 80dB (line) / 75dB (mic)
- Frequency Response: 100Hz – 18kHz
- Power Supply: 230V AC, 50Hz (IEC)
- Dimensions: 350 x 210 x 44mm
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Weight: 4.13kg


