Adastra Audio Products

Adastra UM90 Compact Mixer Amplifier

Adastra Audio Products

Adastra UM90 Compact Mixer Amplifier

100v Mixer-amplifiers with USB audio player 

FM tuner and BlueTooth wireless receiver in an ultra-compact housing.

Microphone input, line input, and USB/FM/BT sections are governed by front panel volume controls and a master volume.

Mono output to either 100V line or 8 Ohms speaker load is connected via screw terminals on the rear panel.

Supplied with hardware for mounting 2 units side by side in a 1U 19" rack space.

Designed as a versatile solution for small to medium PA installations.

  • Ultra-compact form factor
  • Efficient class D amplifier design
  • Internal USB/FM/BT audio player
  • 100V line or 8 Ohms operation
  • SKU 953.179UK
  • Add 2 x 100V background speaker 5" Black
  • Add 1 x FM / DAB Combined VHF Antenna



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The Adastra amplifier UM90 Compact 100V Mixer is a versatile audio mixer designed for use in commercial audio applications where multiple audio sources need to be mixed and distributed to a 100V line speaker system.

The mixer has four mono input channels, each with a balanced XLR input and a 1/4 inch jack input. It also has one stereo input channel with two 1/4 inch jack inputs. The mixer includes a built-in 100V line transformer, which allows it to be directly connected to a 100V speaker system.

The UM90 also has a built-in MP3 player with a USB input, allowing for playback of digital audio files directly from a USB storage device. It also has a built-in Bluetooth receiver, enabling wireless audio streaming from compatible devices.

The mixer features independent level controls for each input channel, as well as bass and treble tone controls for adjusting the overall sound of the audio mix. It also includes a master level control and an on-board amplifier, providing a total power output of up to 90W to drive connected 100V line speakers.

Adastra UM90 Compact 100V Mixer is a versatile and convenient audio mixer that is well-suited for use in small to medium-sized commercial audio installations, such as in retail stores, restaurants, and small conference rooms.

  • Power supply170-264Vac, 50Hz (IEC) or 24Vdc
  • Amplifier : construction Class D + transformer output
  • Audio source Internal USB/FM/BT player
  • Inputs1 x mic (6.3mm), 1 x line (2 x RCA), 1 x aux (3.5mm)
  • Line output2 x RCA (mono)
  • Speaker outputs Screw terminals - 100V / 8 Ohms / Com
  • DC power24Vdc screw terminals
  • Mute24V relay contacts
  • THD<0.4% @ 1kHz
  • Input impedance1k Ohms (mic/line)
  • Input sensitivity-10dB (line), -45dB (mic)
  • SNR80dB (line), 75dB (mic)
  • Frequency response100Hz - 18kHz
  • Output power : rms90W (80W @ 24Vdc power)
  • Alarm output Fog, siren & alert generator
  • Dimensions300 x 210 x 44mm