Broadcast Tools ACS 8.2 Plus


More than just an 8-input, 2-output crosspoint Audio Switcher, the ACS 8.2 Plus adds relay closure and 16 incoming triggers to Simian, using a standard serial port. The ACS 8.2 Plus has the ability to fade between inputs, and also includes a silence sensor, level meters, headphone monitoring and summed mono outputs too.


8-input Audio Switcher With Integrated Triggers, Relays, and Silence Sensor

The Broadcast Tools ACS 8.2 Plus provides matrix audio switching of 8 stereo inputs to 2 stereo plus 2 mono outputs. Any input assigned to output one has fading capabilities. Matrix switching allows any/or all inputs to be assigned to any/or all outputs. The ACS 8.2 Plus is equipped with a front panel monitor selection switch. This allows the user to select which stereo output the VU meters and headphone amplifier monitors. Optional* AGC modules may be added to each output channel to maintain consistent levels. The ACS 8.2 Plus may be controlled via front panel switches, contact closures, 5-volt TTL/CMOS logic and/or the multi-drop RS-232 serial port (An optional USB adapter is available). Installation is simplified with plug-in euroblock screw terminals.

The ACS 8.2 Plus is the ideal hardware to add to BSI Simian, when stations are fed by a number of different satellite network providers. Simian can easily switch between audio inputs and / or respond to incoming trigger closures.

If you are familiar with the Broadcast Tools SS 8.2, the ACS 8.2 Plus is it’s upgraded replacement. Some of the new features are a fully digital audio signal path and the ability to fade between input channels on output 1. Trigger and relay terminals are now on de-pluggable screw terminals for easy installation.

Typically, output 1 is fed direct to the Air chain, while output 2 is wired to the computer record input. This allows one satellite source to be fed to Air, while another is recorded in the background.

An internal stereo silence sensor with front panel LED indicators and relay with adjustable threshold and duration can be used to monitor the incoming satellite feed and trigger Simian to provide a backup service in case of failure.

Each input has a variable level control, so that the volume from all networks can be matched, a task made easier with the front panel LED VU Meters.

There’s also a Stereo headphone amplifier with front panel output selection switch, headphone jack and level control. Outputs are also provided for a Stereo powered speaker output with front panel level control

The ACS 8.2 Plus has enough incoming triggers to respond to satellite network feeds as well as EAS alarms and mixing console remote starts.


  • True matrix switching, any or all inputs may be assigned to any or all outputs. Any input assigned to output one may be faded up, down or dimmed from either the front panel, contact closures, 5-volt TTL/CMOS logic or the multi-drop RS-232 serial port.
  • Logic functions via microprocessor and non-volatile memory.
  • Internal stereo silence sensors monitor both output channels. Each is equipped with front panel “SS” LED indicators; separate SPDT alarm relays, adjustable alarm delay and restore duration. Sensitivity is factory set at -34db.
  • Front panel input selection switches are provided for each input channel with separate output indicator LED’s.
  • Power-up selection of inputs to outputs, mute or last source selected.
  • VU meters with front panel output selection switch.
  • Stereo headphone amplifier with front panel output selection switch, 1/4 
    headphone jack and level control.
  • Most configuration options via rear panel dipswitches.
  • 16 input GPI port (PIP) with LED indicator.
  • 8 open collector channel status outputs or programmable via burst commands.
  • 8 SPDT relay outputs with multiplex function on output two.
  • Programmable via serial burst commands.
  • Multi-turn input and output level controls.
  • Electronically balanced stereo inputs.
  • Electronically balanced stereo and monaural outputs.
  • Low noise and distortion circuitry.
  • Remote control of front panel functions and status.
  • Multidrop RS-232 serial port with data activity LED.
  • Multiple units may be cascaded to expand inputs.
  • 1-RU chassis.

Technical Specifications

  • Input Levels: Max + 27dBu, balanced, bridging. > 20k ohms
  • Output Levels:
    • Stereo balanced outputs 1 & 2, +24 dBm. @ 600 ohms/+27 dbu @ 10K ohms 
    • Monaural balanced outputs 1 & 2, +24 dBm. @ 600 ohms/+27dbu @ 10K ohms 
    • Headphone output, +4 dBm @ 47 ohms
  • Gain: 6dB
  • Frequency Response: 20 to 20 kHz; +/- .0.25dB
  • Signal/Noise Ratio: >85 dB nominal, weighted 20 to 22Khz, @ +27dBu
  • Distortion: Less than 0.01% THD @ +27dBu
  • IMD (250/7kHz): Less than 0.01% IMD @ +27 dBu
  • Crosstalk: -80 dB @ 1khz / -55 dB @ 10 kHz from adjacent off channel
  • Mix Input: Unbalanced summing inputs @ 10k ohms, 0 dBu
  • Switching Method: Digitally controlled professional level analog switch arrays and DACs
  • Logic: Microprocessor / Non-volatile memory
  • Operation Control:
    • Front Panel – Momentary switches 
    • Remote Momentary (> 100ms) compatible with 5 volts 
    • CMOS/TTL logic, open collector or contact closures to ground 
    • RS-232 – Multi-drop RS-232, 2400, 9600, 19200, 38400 8N1
  • Status/Control:
    • Front Panel – LED indicators 
    • Control 8 – SPDT Relays / Silence Sensors – 2 SPDT (1 Amp) 
    • Remote 8 – Open collector outputs 5-6 vdc @ 500ma total 
    • RS-232 – Multi-drop RS-232, 2400, 9600, 19200, 38400 8N1
  • Interfacing:
    • Audio & Remote Control – Rear panel depluggable screw terminals
    • Accommodates 16-28 AWG wire. Mating connectors supplied 
    • RS-232 Serial – RJ-11/6P4C Reversed Modular cable & S9 D-Sub adapter supplied
  • Power: 34.5 Vac @ 500 ma / 10.5 Vac @ 1 amp, 120 Vac 50-60 Hz “Lump in the line” power transformer. Supplied. (CE 240 Vac 50-60 Hz optional)
  • Mechanical: 19″ X 1.75″ X 10.0″ (WHD) 
  • Weight: 5.0 lb

NOTE: Mulitple units can be cascaded for more audio inputs / outputs, but Simian is only able to accept incoming triggers from Unit ID 0.

For information on installing the ACS 8.2 Plus and interfacing it with Simian click here

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