Audio-Technica ATW-901A/L
System 9 VHF Wireless Omnidirectional Lavalier Mic Package


Designed to provide users with rock-solid performance along with easy setup, Audio-Technica's ATW-901A/L is a member of their System 9 lineup and is a pro-quality 4-channel frequency-agile wireless system delivering clear, natural sound integrity. Featuring sleek, stackable, contemporary styling, this particular package comes in the lavalier mic configuration, and offers 4 compatible user-switchable VHF channels (169.505, 170.245, 171.045, and 171.905 MHz).

The package includes the ATW-R900a receiver and and ATW-901a body-pack transmitter with omnidirectional lavalier microphone. The ATW-R900a is a non-diversity, single-channel receiver equipped with an advanced dipole antenna design enabling extended operating range, and enhancing operation by providing a ground element in addition to the usual signal element. The ATW-R900a is also equipped with a volume control as well as AF Peak, RF, and Power indicator lights.

Audio-Technica ATW-901A/L Includes:

  • ATW-R900 receiver
  • ATW-T901 body pack transmitter
  • Omnidirectional lavalier microphone
  • Receiver power supply

Audio-Technica ATW-901A/L Features:

  • Easy operation and clear, natural sound quality
  • (4) selectable frequency-coordinated VHF channels
  • Balanced XLR and unbalanced ¼" output jacks enable use with a wide variety of audio gear
  • Reliable performance and durable construction
  • Advanced dipole antenna system for extended operating range

Audio-Technica ATW-901A/L Specifications:

Overall System

  • 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
     Note: Open range environment with no interfering signals
  • Operating Temperature Range 40° F to 110° F (4° C to 43° C)
     Note: Battery performance may be reduced at very low temperatures
  • Frequency Response: 80 Hz to 13 kHz

ATW-R900 Receiver

  • 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, 100 kOhm load)
    • ¼" (6.3 mm), unbalanced: 700 mV (1 kHz modulation, 10 kHz deviation, 100 kOhm load)
  • Power Supply: 100-240V AC (50/60 Hz) to 12V DC .5A (center positive) switched-mode external power supply
  • Dimensions (W x H x D): 7.48" x 1.82" x 5.06" (190.0 x 46.2 x 128.5mm) 
  • Net Weight: 12.0 oz. (337 g)

ATW-T901 UniPak® Transmitter

  • RF Output Power: 10 mW
  • Spurious Emissions: Following federal and national regulations
  • Input Connection: 4-pin Locking Connector:
    • Pin 1: GND
    • Pin 2: INST INPUT
    • Pin 3: MIC INPUT
    • Pin 4: DC BIAS +9V
  • Batteries: (2) 1.5V AA (sold separately)
  • Battery Life: 8 hours (alkaline)
     Note: Depending on battery type and usage pattern
  • Dimensions (W x H x D): 2.76" x 4.08" x 0.98" (70.2 x  103.7 x 24.9mm)
  • Net Weight (without batteries): 2.8 oz. (80.0 g)

Consumer Alert
Please be aware that certain systems or transmitters operating in the 617-652MHz or 663-698MHz frequency ranges are no longer in compliance with recent regulations set forth by the Federal Communications Commission (FCC). Contact our Sales Pros at 800-356-5844 for help choosing a compliant wireless system that fits your needs and to learn about available trade-in rebates. Details on current wireless regulations are available at

WARNING: Cancer and Reproductive Harm -

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