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TOA TS-820 Central Unit


The TS-820 is a Central Unit of the Infrared Conference System that allows easy installation and flexible layout. By connecting TS-905/907 IR Transmitter/Receiver, TS-820 can control the Chairman and Delegate Units via wireless infrared signal. It features the installation confirmation function that allows the connection status of IR Transmitter/Receiver and Chairman/Delegate Units to be verified. The TS-820 is also equipped with FBS (Feedback Suppression), enabling effective control of acoustic feedback. The system can be controlled by PC (*1). With the use of an optional rack mounting bracket, it can be mounted in an EIA Standard equipment rack (4 unit size).

(*1) free operating software provided


(*) 0 dB = 1V

Power Source : 100 – 240 V AC, 50/60 Hz (use of the supplied AC adapter)

Power Consumption : 72 W

Current Consumption : Max. 3 A DC (when 24 V DC is supplied from the accessory AC adapter)

Carrier Frequency

  • Reception:
    – Audio Channel 1: 7.35 MHz
    – Audio Channel 2: 8.10 MHz
    – Audio Channel 3: 8.55 MHz
    – Audio Channel 4: 9.15 MHz
    – Control Channel: 6.45 MHz
  • Transmission
    – Audio Channel: 1.95 MHz


  • MIC: -60 dB*, 600 Ω, unbalanced, Ø 6.3mm phone jack (2P)
  • AUX: -20 dB*, 10 kΩ, unbalanced, Ø 6.3mm phone jack (2P)


  • LINE: -10 dB*, 10 kΩ, unbalanced, Ø 6.3mm phone jack (2P)
  • REC: -10 dB*, 10 kΩ, unbalanced, RCA pin jack
  • HEADPHONE: Ø 3.5mm mini jack (3P: monaural)

Number of Connectable Chairman/Delegate Units : 64 units

Number of Connectable Infrared Transmitter/Receiver Units : Up to 4 units (with the use of distributor, up to 16 units connectable when they are all TS-905, and up to 12 units when they are all TS-907, or TS-905 and TS-907 are used in combination)

Infrared Transmitter/Receiver I/O Terminal  : BNC jacks

External Control Connection Terminal : D-sub connector (9 P, male) / USB-B selectable

LED Indicator

  • Audio signal receiving indicators 1 – 4 CH, Data signal receiving indicator,
  • External control priority indicator, External control communication indicator,
  • Battery indicator (flashes when a Chairman/Delegate unit’s battery nears complete discharge), Short-circuit indicator

Function Switch

  • No. of open microphones setting switch: 1/2/3/4
  • Mic-off setting switch: TIME OUT ON/OFF
  • Speech priority selector switch: FIRST (First-in-first-out priority), LATEST (Last-in-first-out priority), FIRST: FIXED NEXT: LATEST (Priority
  • ixed for the first unit, and last-in-first-out for all other subsequent units)
  • FBS switch: AUTO/OFF/EXT

Operating Temperature : 0 ℃ to +40 ℃ (32 ゜F to 104 ゜F)

Operating Humidity : 90 %RH or less (no condensation)

Finish : Panel: Surface-treated steel plate, black, 30% gloss, paint

Weight : 2.7 kg (5.95 lb)

Accessory :  AC adapter (Cord length: 1.8 m (5.91 ft) DC cord, and 2 m (6.56 ft) detachable AC cord)…1

Option : Rack mounting bracket: MB-TS920

Operating Software Features

  • Control up to 4 IP camera (Onvif)
  • Control speech time
  • Selection of Chairman or Delegate unit for speech request and approval
  • Ability to map actual conference layout in software display