The Adastra UA90 installation amplifier combines a mixer and a 100 V amplifier in a 1U format, with an RMS output power of 90 W. Its five inputs include three switchable microphone/line inputs, one RCA line input and one 3.5 mm auxiliary input, with separate front-panel volume controls and a master output control.

The mono output supports a 100 V line or an 8 Ω speaker load and connects via a removable screw terminal. The CH1 input provides switchable +20 V phantom power, while the 24 V fire alarm contacts activate mute. Mounting hardware is included for installation in a two-unit rack, and can be configured for single-unit mounting on a wall or under a workbench.

• Type: Integrated installation amplifier
• Class technology: D
• RMS output power: 90 W
• Output: Mono, 100 V or 8 Ω
• Inputs: 3 switchable microphone/line, 1 RCA line, 1 3.5 mm auxiliary
• Phantom power: Switchable +20 V on CH1
• Mute: 24 V fire alarm relay contacts
• Frequency response: 100 Hz–18 kHz
• Harmonic distortion: <0.4% at 1 kHz
• Signal-to-noise ratio: 80 dB (line), 75 dB (microphone)
• Input sensitivity: -10 dB (line), -45 dB (microphone)
• Input impedance: 1 kΩ (microphone/line)
• Power supply: 170–264 V AC, 50 Hz
• Dimensions: 300 × 210 × 44 mm
• Weight: 3 kg