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AMCOM II 2825R/24/26DSP3 Two Diver DSP3 Rack Mount Helium Speech Unscrambler REFERENCE ONLY

SKU: OBS-2825R/24/26DSP3 Rate this product

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    This item number has been replaced by 2825R-02


    • Real-time audio processing uses both frequency and time domain technologies for optimized performance over a wide range of depths and background noise
    • Improved Treble Boost Control feature allows for optimum frequency enhancement and improved intelligible speech from the commercial diver’s voice
    • Multi-turn Depth Control allows the tender to finely adjust the amount of correction used to provide the best possible speech quality
    • The Noise Reduction Filter (NRF) uses a complex Digital Signal Processor algorithm to capture the background noise and reduce it without affecting the diver’s speech
    • Noise reduction level can be reduced by up to 17 dB


    • Input Impedance(Each Input): 250 Ohms
    • Common Mode Rejection: 40 dB Minimum
    • Current Drain:
      • Maximum Full Volume 3 Amps
      • Minimum Quiescent 250 mAmps
    • Output Impedance: 4 Ohm
    • Audio Power Output: 20 Watts per channel
    • Frequency Response: 300 to 10,000Hz
    • Power Supply Voltage: 12 VDC Nominal (9 Volts Minimum - 18 Volts Maximum)
    • AC Voltage Range: 90-264 VAC, 47-440 Hz
    • Sensitivity (input): 1.6mVRMS
    • Dimensions: 7 in. H x 19 in. W x 12.5 in. D (17.8 cm x 48.25 cm x 31.75 cm)
    • Weight: 19.5 lbs. (8.8 kg)

    Amcom ™ II 2-Diver DSP3 Rack Mount Helium Speech Unscrambler - P/N: 2825R/24/26DSP3 Includes:

    • (1) Hand-Held Push-to-Talk Microphone - P/N: 2405-28
    • (2) 6VDC Spring-Top Gel-Cell Rechargeable Batteries - P/N: 2890-04 - Expected life: 10 Hrs
    • (1) MS Connector - 20 Pin - P/N: MS-3106A-28-16P
    • (1) MS Connector Cable Clamp - P/N: MS-3057-16A
    • (1) Power Cord - P/N: P-2392
    • (1) User Manual

    Tech Note: All communicators will transfer topside noise to the diver when using the radio speaker only. To eliminate background noise and achieve clear concise communications, use a Push-to-Talk microphone, headset, or a Remote Walk-and-Talk with a headset.

    Note: Amron reserves the right to change the battery brand at any time without notice.


    This item number has been replaced by 2825R-02

    The Amcom ™ II Series 2825R communicator features hard-wired, two-diver communicators for both air and mixed gas commercial diving making this the most versatile and powerful two-diver communicator on the market today.

    The most unique feature is the design of separate channels and volume controls for each diver and the tender, both for the uplink and the downlink paths. Each diver may have different equipment such as microphones and speakers or different listening and speaking characteristics. You can set the volume for each diver and tender to their individual comfort level. Diver communication configurations are either 2-wire or 4-wire mode or any combination of the two modes. The Amcom ™ II 2825R series of commercial diver communication systems include Amron’s new DSP3 Helium Speech Unscrambler (HSU) utilizing the latest in technological advancements. The core of our design incorporates a state-of-the-art digital signal processor to correct raw helium speech to clear, intelligible voice. The improved Treble Boost offers greater control over the amount of gain added to the High Frequency portion of the diver’s microphone. The Depth Control can be finely-tuned using a multi-turn potentiometer providing the tender with better speech quality. The Noise Reduction Filter (NRF) uses a complex Digital Signal Processor algorithm to capture the background noise and reduce it without affecting the divers’ speech.

    This innovative concept allows our HSU to be truly the first unscrambler to use both frequency and time domain technologies for real-time audio processing. This state-of-the-art digital design accommodates a multitude of functions ranging from the correction of the diver’s raw helium speech to normal intelligible voice levels, advanced treble boost, and complex noise reduction filters (NRF).


    Product FAQ's

    Ask a Question

    • What type of cable do I need to connect my Amron communicator to my Outland video system?
      Amron communicators and Outland Technology’s video systems have a RCA Phono Jack. To connect the two systems together, you will need an audio cable with RCA Plugs on each end.
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    • Should I use a GFI when operating my radio off AC power?

      When operating your Amron Diver Communicator on AC, it is critical to use a Ground Fault Circuit Interrupter (GFCI) or isolation transformer for tender and diver safety. Surges and spikes are common on AC lines found on ships, generated locally, or at the end of long extension cable runs and can exceed 1kVolt. Such surges and spikes can cause the fuse to blow on the amplifier card assembly. The power supply is designed so that such a failure will be isolated and will not cause a safety issue to the tender or divers. It is strongly advised that your Amron Diver Communicator be operated on an AC circuit with a high quality surge arrester or an AC isolation transformer.

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    • Does the noise reduction filter remove all the background noise from the diver's topside audio?

      Depending on the settings you’re using, the sound level of the background noise can be reduced by as much as 18 dB.

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    • Why does the speaker on my communicator sound muffled?
      The simplest way to fix this issue is to unplug the red banana plug from the red microphone 5-way binding post on the communicator and rotate it 180 degrees then reinstall it. This should fix your problem. For a more detailed explanation of what happened, please read below. The issue is not with the communicator, it is with the wiring of the umbilical. There is always the potential for wiring the speakers and microphone out of phase, similar to wiring the speakers on a car stereo system. There is an orientation to the banana jacks and they should be wired for proper phasing with the communicator. A banana plug does have an identified ground side marked on the plug. Amron always sets up their umbilicals so that the ground side is located on the left side so the user can consistently plug in their umbilical and avoid phasing issues. If a banana plug is plugged upside down or is wired out of phase, the sound quality will be significantly reduced. If the phasing is out and the orientation of both plugs are the same, then the banana plug wiring should be reversed on “only one plug” to avoid this issue again. It does not matter which plug you choose to reverse the wiring on.
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    • How can I test for a blown fuse on my Amcom series communicator?

      If the unit is plugged into a live outlet and turning on the switch does not cause the AC POWER LED to light up, then the fuse(s) are probably blown. Unplug the unit from the outlet, remove the fuses and check continuity with a multimeter. Replace any fuse that does not show continuity.

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    • How do I install a new microphone in my Amcom II or III Communicator?
      Please refer to the Panel Microphone Installation instructions located in the attachments tab.
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    • Can I operate my communicator while I’m charging the internal battery?
      Yes, however, the charger will charge the battery at a slower rate as some of the charger power is being used to operate the communicator.
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