The Adastra UM30 installation amplifier combines Class D power amplification with transformer output, USB playback, FM radio and Bluetooth. The mono output connects to a 100 V line or 8-ohm speakers via screw terminals. The volume of the microphone and line inputs, as well as the USB, FM and Bluetooth sources, is adjusted using the front-panel controls and master volume.

Hardware is included for mounting two units side by side in a 1U 19" rack space.

• Type: Installation power amplifier
• Power: 30 W RMS
• Amplifier technology: Class D with transformer output
• Audio sources: USB, FM and Bluetooth
• Inputs: 1 x 6.3 mm microphone, 1 x 2 RCA line and 1 x 3.5 mm AUX
• Line outputs: 2 x RCA, mono
• Speaker outputs: 100 V / 8 ohms / Com screw terminals
• Power supply: 170–264 Vac, 50 Hz via IEC or 24 Vdc
• Mute: 24 V relay
• Input impedance: 1 kOhm for microphone and line
• Input sensitivity: -10 dB for line, -45 dB for microphone
• Signal-to-noise ratio: 80 dB for line, 75 dB for microphone
• Frequency response: 100 Hz–18 kHz
• THD: <0.4% at 1 kHz
• Dimensions: 340 x 370 x 218 mm
• Weight: 2.35 kg