Audio-Technica ATW-901A/H
System 9 VHF Headworn Wireless Microphone System, Pro8HEcW Mic


A frequency-agile 4-channel wireless system, Audio-Technica's ATW-901A/H is a member of their System 9 family, and is engineered to deliver rock-solid performance, while offering easy setup and clear, natural sound quality. Featuring sleek, stackable, contemporary styling, this particular model is a headworn mic configuration. The system offers 4 compatible user-switchable VHF channels (169.505, 170.245, 171.045, and 171.905 MHz).

The ATW-901A/H includes the ATW-R900a receiver and ATW-901a body-pack transmitter with PRO 8HecW headworn microphone. The ATW-R900a is a non-diversity, single-channel receiver that includes an advanced dipole antenna design, extending operating range and improving operation by providing a grounding element in addition to the usual signal element. It's also equipped with a volume control along with AF Peak, RF, and Power indicator lights.

Audio-Technica ATW-901A/H Includes:

  • ATW-R900a receiver
  • ATW-T901a body pack transmitter
  • PRO 8HEcW headworn microphone
  • Receiver power supply

Audio-Technica ATW-901A/H 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/H Specifications:

Overall System

  • Operating Frequencies: VHF high band, 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: 200ft (60 m) typical
  • 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 - 13 kH

ATW-R900a 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" (6.3mm), 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-T901a Body Pack 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 upon battery type and use 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 gram)

PRO 8HEcW Headworn Microphone

  • Element: Dynamic
  • Polar Pattern: Hypercardioid
  • Frequency Response: 200 Hz - 18 kHz
  • Open Circuit Sensitivity: -55 dB (1.7 mV) re 1V at 1 Pa
  • Impedance: 600 ohms
  • Weight: 2.1 oz. (60 g)
  • Dimensions:
    • Microphone (Ø): 0.80" (20.4mm)
    • Headset: 4.72" (120.0mm) nominal at widest point, 3.17" (80.5mm) flexible boom
  • Output Connector: 3-pin XLRM-type on cable
  • Cable: 7.2' (2.2m) long, 0.11" (2.8mm) diameter miniature audio cable, permanently attached between microphone and XLRM-type connector

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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