The Adastra MM321 analog mixer fits into a 1U rack and combines five channels with an integrated media player and Bluetooth receiver. The three microphone or line inputs support +20 V phantom power, while channel 1 offers priority operation. For line sources, there are two stereo RCA auxiliary inputs, as well as a 3.5 mm AUX input on the media player.

The media player plays audio from Bluetooth, USB and the FM tuner. Outputs include a stereo XLR output, a mono 6.3 mm output and an RCA recording output. There are also 24 V emergency mute contacts on all channels except channel 1, as well as controls for the inputs, treble, bass and master level.

• Type: Analog
• Channels: 5
• XLR microphone/line inputs: 3
• RCA auxiliary inputs: 2 stereo
• AUX input: 3.5 mm
• Bluetooth: Integrated receiver
• Playback: USB and FM tuner
• Phantom power: +20 V, switchable on channels 1–3
• Priority operation: On channel 1
• Emergency mute contacts: 24 V, on all channels except channel 1
• Outputs: Stereo XLR, mono 6.3 mm and RCA recording
• Microphone frequency response: 20 Hz–18 kHz
• Line frequency response: 14 Hz–20 kHz
• AUX frequency response: 10 Hz–23 kHz
• Microphone/line input sensitivity: -45 dBV
• AUX/line input sensitivity: -10 dBV
• Microphone signal-to-noise ratio: 55 dB
• AUX/line signal-to-noise ratio: 60 dB
• THD: 0.05%
• Dimensions: 482 × 130 × 44 mm
• Weight: 1.43 kg