Toa Electronics M-864D Digital Stereo Mixer

BH #TOM864D • MFR #M-864D CU
Toa Electronics
Toa Electronics M-864D Digital Stereo Mixer
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Toa Electronics M-864D Digital Stereo Mixer

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Toa Electronics M-864D Overview

  • 1Description
  • 2Automatic Resonance Control
  • 3Feedback Suppressor
  • 4Automatic Stereo Input Mute (Auto Mute or Ducker)

The Toa Electronics M-864D Digital Stereo Mixer is a 4U rack mountable digital stereo mixer with 8 monaural mic/line input channels, 7 stereo input channels, and 6 output channels, including 4 bus-assignable monaural output channels and 1 stereo recording output channel. 

The unit is equipped with digital signal processing functions such as automatic resonance control, feedback suppressor (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, the M-864D can be operated without the need or use of a PC. However, it can also be operated by connecting the PC or optional Remote control panel, and can be mounted in an EIA standard component rack (4U size).

Automatic Resonance Control

Automatic Resonance Control function automatically creates an appropriate equalization curve based on measuring the acoustic characteristics inherent in an architectural space, thus improving sound clarity

Feedback Suppressor

The Feedback Suppressor (FBS) eliminates feedback from microphones that are moved to multiple locations

Automatic Stereo Input Mute (Auto Mute or Ducker)

Automatically mutes the stereo input when monaural signals are detected

Toa Electronics M-864D Specs

Power Source100 – 120 VAC, 60 Hz, CU


Power Consumption30 W
Frequency Response20 Hz - 20 kHz, ±1 dB
Sampling Frequency48 kHz
Dynamic Range100 dB or more (IHF - A weighted)
Distortion0.03 % or less, 1 kHz, +4 dB (*2) input/output, 20 Hz − 20 kHz BPF
Crosstalk−80 dB or less, 1 kHz
InputMonaural input, 8 channels, removable terminal block (3 P)

Phantom power (+24V DC, 10 mA, ON/OFF switchable for each channel)

Gain Setting (settable for each channel) :

PAD ON gain min., +4 dB* (max. +24 dB*), 10 kOhms, electronically-balanced, gain max., −14 dB* (max. +6 dB*), 10 kOhms, electronically-balanced

PAD OFF gain min., −10 dB* (max. +10 dB*), 7 kOhms, electronically-balanced, gain max., −56 dB* (max. −36 dB*), 7 kOhms, electronically-balanced

Stereo Input (L, R), 7 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 dB* (max. +10 dB*), 10 kOhms, trim gain for each individual channel: −∞ to 0 dB (except front-mounted input)

• 1-A (L), 1-B (L), and 1-C (L) are mixed after passing through each trim gain circuit (the same applies to R channel)

• 2-A (L), 2-B (L), and 2-C (L) are mixed with front-mounted input after passing through each trim gain circuit (the same applies to R channel)


Output4 channels, +4 dB* (max. +24 dB*), applicable load 600 ohms or more, electronically-balanced, removable terminal block (3 P), REC OUT (L, R): –10 dB* (max. +10 dB*), applicable load 1 kOhms or more, RCA jack, gain is adjustable


A/D Converter24-bit
D/A Converter24-bit
Signal ProcessingAutomatic Resonance Control (ARC): Automatic EQ curve creation by ARC, 4 channels (each output channel), settable independently on each channel

Feedback Suppressor (FBS): Feedback suppressor filter creation, 8 channels (each monaural input channel), settable independently on each channel

Filter: 8 channels (each monaural input channel), settable independently on each channel, high-pass filter: 20 Hz − 20 kHz

Tone Controller: BASS, Low-shelving filter: 20 − 500 Hz, ±15 dB, MID, parametric equalizer: 20 Hz − 20 kHz, ±15 dB Q: 0.267 − 69.249, TREBLE, high-shelving filter: 6 − 20 kHz, ±15 dB, 10 channels (each monaural input channel, each stereo mixing input channel), settable independently on each channel

Equalizer: Parametric equalizer: 20 Hz − 20 kHz, ±15 dB, Q: 0.267 – 69.249, 4 channels (each output channel)

Matrix: 12 x 4

Crosspoint Gain: −∞ to 0 dB in 1 dB steps

Automatic Mute: Stereo input section matrix, independent control

Function: Input PAD (−16 dB) control, low cut (cutoff frequency: 100 Hz) control, analog output attenuator (−6 dB, −12 dB, −18 dB, −24 dB, −36 dB, −42 dB) control,  system lock function, stereo summing function, Control knobs (3 rotary encoders)


Front PanelInput Level Indicator: 3-point LED, 12 channels (each monaural input channel, stereo 1L, 1R, 2L, 2R)

Output Level Indicator: 8-point LED, 4 channels (each output channel)

Auto Resonance Control (ARC) Measurement: ARC switch x 1, ARC operation indicator x 1

Feedback Suppressor (FBS) Function: Feedback Suppressor switch x 8, Feedback suppressor indicator x 8

Low Cut Filter: Low cut switch x 8, Low cut indicator x 8

Summing Output: Monaural summing switch x 2, Monaural summing indicator x 2

Tone Control: BASS, MID, TREBLE/Settable with control knobs, 10 channels (each monaural input channel, stereo 1L, 1R, 2L, 2R)

Monaural Input, Analog Setting: Gain setting, PAD ON/OFF, Phantom power ON/OFF, Settable with control knobs, 8 channels (each monaural input channel)

Stereo Input, Analog Setting: Trim setting, Settable with control knobs, 6 channels (1-A, 1-B, 1-C), (2-A, 2-B, 2-C)

REC OUT, Gain Setting Gain Setting: Settable with control knobs, 2 channels (REC OUT L, REC OUT R)

Preset Memory Switching: Preset memory key x 4, Preset memory indicator x 4

System Lock: System lock key x 1, System lock indicator x 1

Operation Status Indication: Operation status indicator x 3

Function Setting Section: Control knob x 3, 10-point position indication LED x 3, Tone control mode indicator x 1, Gain control mode indicator x 1, Trim control mode indicator x 1

Analog Volume Fader: Input volume fader x 10, Output volume fader x 4, 2 faders linkable with supplied gang bar


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

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

Remote Control Panel: 2 channels

Maximum Number of Units: 8 units per channel 24 V DC input x 2, termination switch x 1, removable terminal block (10 P)

Maximum Total Cable Length (Star Wiring): 800 m or 870 yd (total for 2 channels)

Maximum Cable Length (Daisy Chain Wiring): 400 m or 435 yd per channel

Note: In daisy chain wiring, the number of units differs depending on the cable length, star wiring and daisy chain wiring cannot be used together

Type of Cable: Shielded CPEV cable (a pair of data cable and a pair of power supply cable) or shielded Cat 5 twisted pair cable for LAN (CAT5-STP)


Network I/F: 1 channel of 10BASE-T/100BASE-TX (auto-negotiation), RJ45 connector, connection via switching hub

Network protocol: TCP/IP

Connection Cable: Shielded Cat. 5 or higher twisted pair cable for LAN (Cat. 5-STP or better)

Maximum Cable Length: 100 m or 110 yd (between M-864D and switching hub)

Operating Temperature0 to 40 ºC (32 to 104 ºF)
Operating Humidity90 %RH (no condensation)
FinishPanel: Aluminum, hairline, black, Case: Surface-treated steel plate
Dimensions19 x 6.97 x 6.19" (482.6 x 177.1 x 157.2 mm)
Weight11.24 lb (5.1 kg)
Packaging Info
Package Weight14.85 lb
Box Dimensions (LxWxH)22.835 x 10.63 x 10.039"
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