Adastra MM321 1U Rack Mixer 3 Microphone / Line Inputs Bluetooth & USB / FM Media Player

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3 mono inputs connect via XLR microphone or line input (switchable). Each of these inputs has switchable +20V phantom power for use with condenser microphones or D.I. boxes and channel 1 has a variable priority function. Two stereo auxiliary line inputs are provided on RCA connectors with a stereo record output. Media player operating modes include 3.5mm Aux input, USB audio player, FM radio tuner and Bluetooth receiver for playback from a smart phone or tablet. Main left and right outputs are fed to XLR with an additional mono summed output on 6.3 jack. Versatile yet easy to use as a main mixer for background music, public address and house PA systems.


  • Built-in Bluetooth receiver
  • Media player with USB playback and FM tuner
  • Switchable +20V phantom power
  • Variable priority muting for channel 1
  • 24V emergency mute contacts


  • Power supply 100-240Vac, 50/60Hz (IEC)
  • Fuse T1AL
  • Inputs: mic/line 3 x XLR (bal/unbal)
  • Inputs: aux 2 x L+R RCA
  • Input: line 3.5mm jack to media player
  • Audio source Internal Bluetooth, USB & FM player
  • Outputs L+R XLR, Mono 6.3mm jack, Record out (RCA)
  • Emergency control 24V contacts mute all except channel 1
  • Phantom power +20V (switchable channels 1-3)
  • Controls Media, 3 x Mic/Line, 2 x Aux, Treble, Bass, Master level
  • Rear panel controls Priority muting level, mic/line and phantom DIP switches
  • Input impedance 2.2k Ohms (mic/line), 10k Ohms (aux)
  • Frequency response: mic 20Hz - 18kHz
  • Frequency response: line 14Hz - 20kHz
  • Frequency response: aux 10Hz - 23kHz
  • Input sensitivity: mic/line -45dBV
  • Input sensitivity: aux/line -10dBV
  • Signal to noise ratio: mic 55dB
  • Signal to noise ratio: aux/line 60dB
  • THD 0.05%
  • Dimensions 482 x 130 x 44mm
  • Weight 1.43kg