Digital stereo mixer

The M-864D digital stereo mixer maintains the basic functionality and operability of its predecessor, the M-633D, but adds such versatile features as analog-feel fader operation, 8 monaural and 7 stereo input channels, remote controller operation and fine-tuning of settings with GUI software.
With its release, TOA has made the clear sound achieved by its proprietary resonance control technology available for use in hotel banquet rooms, multipurpose halls and other facilities that host events of various types.

  • 15 input and 5 output channels per unit
  • Equipped with digital signal processing functions such as automatic resonance control function (ARC), Feedback suppressor function (FBS), Automatic stereo input mute function (AUTO MUTE or Ducker) and Equalizer
  • Advanced acoustic compensation can be automatically performed without using an acoustic measuring instrument
  • Furnished with various function setting buttons and 14 analog volume faders
  • Can be operated without need for use of a PC, by connecting the PC, optional Remote control panel or via iPad app

  • Specifications
  • Application examples
  • Equipment
  • Tender text
  • Downloads
Specifications for product:
Power source

220 - 240 V AC, 50 / 60 Hz

Frequency response

20 Hz - 20 kHz (±1 dB)


< 0.03 % (at 1 kHz)

Power consumption

30 W


-80 dB


8 monaural input channels, removable terminal block (3P)
• Phantom power (+24 V DC, 10 mA, ON/OFF switchable for each channel)
• Gain setting (settable for each channel)

7 stereo input (L, R) channels (1-A, 1-B, 1-C, 2-A, 2-B, 2-C, front mounted input)
RCA jack (stereo mini jack provided on the front panel)
• -10 dBu (max. +10 dBu), 10 kΩ
• Trim gain for each individual channel: -∞ to 0 dB (except front mounted input)

Contact input: 8 channels, open voltage: 24 V DC, short-circuit current: 5 mA, removable terminal block (10P)


4 output channels, +4 dBu (max. +24 dBu), applicable load 600 Ω or more, electronically-balanced, removable terminal block (3P)
1 recording output (L, R) channel: -10 dBu (max. +10 dBu), applicable load 1 kΩ or more, RCA jack, gain is adjustable

Contact output: 8 channels, no-voltage make contact, contact capacity: 24 V DC/100 mA, removable terminal block (10P)

Signal processing

Automatic Resonance Control (ARC) Function, Feedback Suppressor Function, Matrix: 12 x 4, Crosspoint Gain: -∞ to 0 dB in 1 dB steps, Auto Mute Function

Sampling frequency

48 kHz / 24 bits

Equalizer / Filter

Filter: 8 channels (each monaural input channel), high-pass filter: 20

Hz – 20 kHz, Tone Controller: BASS, MID, TREBLE, Parametric Equalizer:

20 Hz – 20 kHz, ±15 dB, 4 channels (each output channel)

Operating humidity

90 % RH (no condensation)

Operating temperature

0 °C to +40 °C


Aluminium, hairline, black


482.6 x 177.1 x 157.2 mm (W x H x D)


5.1 kg

Accessory (included)

Power supply cord (2 m) x 1, removable terminal plug (3P) x 12, large type removable terminal plug (10P) x 2, small type removable terminal plug (10P) x 1, fader gang bar x 4, protective cover x 1, rack mounting screw x 4, CD-ROM (containing setup software) x 1

Application examples
Tender text