System 9

Frequency-agile VHF Wireless Systems

MSRP* US$149.95 - US$259.95   |  Two-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.

  • Overview
  • Features
  • Configurations
  • Specifications
  • Downloads
  • Reviews
  • Q & A

  • Overview

    Audio-Technica's System 9 is a four-channel frequency-agile wireless system designed to provide rock-solid performance along with easy setup and clear, natural sound quality. Featuring sleek, stackable, contemporary styling, System 9 is available in handheld, headworn, guitar, lavalier and body-pack configurations. The system offers four compatible user-switchable VHF channels (169.505, 170.245, 171.045, and 171.905 MHz).

    Each System 9 configuration includes the ATW-R900 receiver and either a body-pack transmitter or handheld microphone/transmitter. The ATW-R900 is a non-diversity, single-channel receiver with advanced dipole antenna design for extended operating range, which improves operation by providing a ground element in addition to the usual signal element. The ATW-R900 also offers volume control along with AF Peak, RF and Power indicator lights.
  • Features

    • Easy operation and clear, natural sound quality

    • 4 selectable frequency-coordinated VHF channels

    • Balanced XLR and unbalanced 1/4¡± output jacks enable use with a wide variety of audio gear

    • Reliable performance and durable construction

    • Advanced dipole antenna system for extended operating range
  • Configurations

    UniPak® Transmitter System
    ATW-R900 receiver and ATW-T901 UniPak® transmitter. Select a Wireless Essentials® microphone or cable to complete the system.
    UniPak® Guitar System
    ATW-R900 receiver and ATW-T901 UniPak® transmitter with AT-GcW guitar/instrument input cable.
    UniPak® Headworn Microphone System
    ATW-R900 receiver and ATW-T901 UniPak® transmitter with PRO 8HEcW headworn microphone.
    UniPak® Headworn Microphone System
    ATW-R900 receiver and ATW-T901 UniPak® transmitter with PRO 92cW headworn microphone.
    UniPak® Headworn Microphone System
    ATW-R900 receiver and ATW-T901 UniPak® transmitter with PRO 92cW-TH headworn microphone (beige).
    UniPak® Lavalier Microphone System
    ATW-R900 receiver and ATW-T901 UniPak® transmitter with omnidirectional lavalier microphone.
    Handheld Microphone System
    ATW-R900 receiver and ATW-T902 handheld dynamic unidirectional microphone/transmitter. Includes AT8456a Quiet-Flex™ stand clamp.
  • Specifications

    Operating Frequencies VHF highband, 169 MHz to 172 MHz
    Modulation Mode FM
    Maximum Deviation +/-10 kHz
    Dynamic Range >/=90 dB (A-weighted), typical
    Total Harmonic Distortion <1% (at 1 kHz, +/-10 kHz deviation)
    Operating Range 200' (60 m) typical
    Open range environment with no interfering signals
    Operating Temperature Range 40° F (4° C) to 110° F (43° C)
    Battery performance may be reduced at very low temperatures
    Frequency Response 80 Hz to 13 kHz
    Receiving System Non-diversity, single-channel, dual antenna system
    Image Rejection 50 dB minimum
    RF Sensitivity 20 dBuV at 60 dB S/N ratio (50 ohms termination)
    Audio Output Nominal Output Level
    XLR, balanced: 350 mV (1 kHz modulation, 10 kHz deviation, 100k ohm load)
    1/4" (6.3 mm), unbalanced: 700 mV (1 kHz modulation, 10 kHz deviation, 100k ohm load)
    Power Supply 100-240V AC (50/60 Hz) to 12V DC .5A (center positive) switched mode external power supply
    Dimensions 7.48" (190.0 mm) W x 1.82" (46.2 mm) H x 5.06" (128.5 mm) D
    Net Weight 12.0 oz (337 grams)
    Accessory Included Power supply
    RF Power Output10 mW
    Spurious EmissionsFollowing federal and national regulations
    Input ConnectionsFour-pin Locking Connector
    Pin 1: GND
    Pin 2: INST INPUT
    Pin 3: MIC INPUT
    Pin 4: DC BIAS +9V
    BatteriesTwo 1.5V AA
    not included
    Battery Life8 hours (alkaline)
    Depending on battery type and use pattern
    Dimensions2.76" (70.2 mm) W x 4.08" (103.7 mm) H x 0.98" (24.9 mm) D
    Net Weight2.8 oz (80.0 grams)
    without batteries
    RF Power Output 10 mW
    Spurious Emissions Following federal and national regulations
    Batteries Two 1.5V AA
    not included
    Battery Life 8 hours (alkaline)
    Depending on battery type and use pattern
    Dimensions 9.91" (251.8 mm) long,
    2.11" (53.5 mm) diameter
    Net Weight 9.2 oz (260 grams)
    without batteries
    Accessory Included AT8456a Quiet-Flex™ stand clamp

    Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change. For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC) or visit the FCC's wireless microphone website at

  • Downloads

    System 9 Manual (pdf 965.56 KB)
    Wireless Mics & Cables Wireless System Accessories Using Wireless
  • Reviews

  • Q & A

    Do you have questions about this product?

    Get answers from real customers and in-house experts with AnswerBox.

    4 Questions | 4 Answers
    Displaying questions 1-4
    • Q:

      What mics can be used with this System 9? I have a client that would like options as to what mics can be used with this system that we have installed in her business.
      Asked on 9/28/2016 by Tony from Okemos, MI

      1 answer

      • Staff Reviewer


        The compatible transmitters are the ATW-T901 UniPak transmitter which can be used with any wireless lavalier or headworn microphone ending in the code "cW", such as the BP892cW. The compatible handheld transmitter is the ATW-T902.

        Answered on 9/29/2016 by ATUS_Specialist3
    • Q:

      Does the microphone indicate (by LED) when it is "on", in a "mute" state, and/or when the battery is low? I returned some mics from another company because their "power" light only flickered once when powering on - then stayed off. I'm still not sure what purpose it served.
      Asked on 8/16/2016 by Rick, in search of power LED from Atlanta

      1 answer

      • Staff Reviewer


        Thank you for your inquiry. Yes, there is power, mute and low battery lights on the transmitter.

        Answered on 8/19/2016 by AudioSolutionsManager from Audio-Technica U.S., Inc.
    • Q:

      Would two remote mics connect at the same time?
      Asked on 7/27/2016 by John from Madison, WI

      1 answer

      • Staff Reviewer


        With any and all wireless systems, the rule is one transmitter per receiver at a time. This means that you will need the same number of receivers as you want to have microphones operating simultaneously. Some systems on the market that are sold as multiple microphone transmitters and a single case receiver are actually multiple receivers built into a single casing, similar to the System 10 PRO.

        With all of that being said, you may operate (2) System 9 transmitters and (2) receivers at the same time with them being on different frequencies.

        Please contact our Audio Solutions Department at (330) 686-2600 ext 5000 or at for assistance with this.

        Answered on 8/3/2016 by ATUS_Specialist3
    • Q:

      Can I use an I'm ear monitor with this system?
      Asked on 7/16/2016 by Lukas from Canada

      1 answer

      • Staff Reviewer


        Thank you for your inquiry. Please contact the Audio Solutions team at 330-686-2600 ext. 5000. They will be happy to help with this.

        Answered on 7/25/2016 by AudioSolutionsManager from Audio-Technica U.S., Inc.
    Displaying questions 1-4

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