Audio Technica System 901 Microphone System for Accordion

Audio TechnicaSKU: ATW-901A/G-ATM350UCW-AT8490L-AT8491S
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Sale price$452.95

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  •  Audio Technica System 901 Microphone Transmitter and Bodypack: ATW-901A/G
  • Audio Technica ATM350UCW Cardioid Condenser Clip-On Instrument Microphone: ATM350UCW
  • Audio Technica AT8490L Long UniMount for ATM350: AT8490L
  • Audio Technica AT8491S Accordion Surface Mount: AT8491S

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-R900a receiver and either a body-pack transmitter or handheld microphone/transmitter. The ATW-R900a 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-R900a also offers volume control along with AF Peak, RF and Power indicator lights.

  • Easy to use, with clear and natural sound quality
  • 4 frequency-coordinated selectable VHF channels
  • 1/4" balanced and unbalanced XLR output connectors compatible with a wide variety of audio adapters
  • Reliable performance and rugged manufacturing
  • Advanced dipole antenna system to increase operating range



  • Operating Frequencies: VHF high band, 169 to 172 MHz
  • Modulation Mode: FM
  • Maximum Deviation: +/- 10 kHz
  • Dynamic range: > / = 90 dB (Weighting A), typical
  • Total harmonic disturbance: <1% (at 1 kHz, deviation of +/- 10 kHz)
  • Total harmonic distortion: <1% (at 1 kHz, deviation of +/- 10 kHz)
  • Operating Range: 200 '(60 m), typical (Open environment without signal interference)
  • Operating Temperature Range: 40 ° F (4 ° C) to 110 ° F (43 ° C) (Battery and LCD display performance may be affected by very low temperatures.)
  • Frequency Response: 80 Hz to 13 kHz
  • Maximum Simultaneous Use (Recommended): 200 'minimum


  • Receiver System: Dual antenna system, without diversity and a single channel Image rejection: 50 dB minimum
  • RF sensitivity: 20 dBuV at 60 dB S / N (50 ohm 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: 100-240 V AC (50/60 Hz) at 12 DC. 5 A (positive center) switched mode, external power supply
  • Dimensions:0 mm (7.48 ") wide x 46.2 mm (1.82") high x 128.5 mm (5.06 ") deep
  • Net Weight:0 oz (337 g)
  • Accessory Included: Power Supply


  • RF Power Output: 10 mW
  • False Emissions: According to federal and national regulations
  • Input Connections: Connector with four pin anchor; Pin 1: Earth; Pin 2:
  • Instrument input; Pin 3: Microphone input; Pin 4: DC + 9V polarization
  • Batteries: Two 1.5V AA type, not included
  • Battery Life: 8 hours (alkaline) (Depending on the type of battery and usage pattern)
  • Dimensions:2 mm (2.76 ") wide x 24.9 mm (0.98") deep x 103.7 mm (4.08 ") high
  • Net Weight:8 oz (80 g), without batteries


  • RF Power Output: 10 mW
  • False Emissions: According to federal and national regulations
  • Batteries: Two 1.5V AA type, not included
  • Battery Life: 8 hours (alkaline) (Depending on the type of battery and usage pattern)
  • Dimensions:91 "(251.8mm) long, 2.11" (53.5mm) diameter
  • Net Weight:2 oz (260 g), without batteries
  • Accessory Included: Quiet-Flex ™ AT8456a Pedestal Clamp

Designed for wind-metal instruments, saxophone and others, the UniMount® ATM350U mounting system offers you the tools to act with confidence. The system includes the ATM350a cardioid condenser microphone, a microphone that supports high levels of sound pressure, and offers a clear and well-balanced response from any instrument. When combined with the AT8491U universal clamp and the flexible, rugged AT8490 5-inch gooseneck included, the mic can be securely attached to the instrument strap and positioned to stay where you want it - the gooseneck will remain static regardless of where the instrument moves when playing.

The cardioid polar pattern of the microphone isolates the instrument by reducing the pickup of side and rear sounds, and the switchable 80 Hz high-pass filter of the in-line power module helps control unwanted low-frequency noise. The system also includes a violin holder (AT8468) with Velcro fastener and a carrying case.

  • Small microphone that goes virtually unnoticed
  • Clear, bright and well-balanced response, even at high sound pressure levels
  • Cardioid polar pattern that reduces the capture of lateral and posterior sounds, improving the isolation of the desired sound source
  • UniMount® AT8491U Universal Clamp that securely attaches to the instrument's mail and provides excellent anti-vibration protection for the microphone
  • Robust UniMount® AT8490 5-inch gooseneck that stays rigid at all times, allowing the microphone to position accurately even during the most aggressive performances
  • In-line power module equipped with a switchable 80 Hz high-pass filter that controls unwanted ambient noise 4-pin lockable connector for use with cW style body-pack transmitters
  • Interchangeable elements available for hypercardioid and omnidirectional polar patterns
  • Violin support with Velcro fastener is included as an additional mounting option


  • ELEMENT: Fixed-charge back plate, permanently polarized condenser
  • POLAR PATTERN: Cardioid
  • FREQUENCY RESPONSE: 40 – 20,000 Hz
  • LOW FREQUENCY ROLL-OFF: 80 Hz, 12 dB/octave
  • OPEN CIRCUIT SENSITIVITY: –49 dB (3.5 mV) re 1V at 1 Pa
  • IMPEDANCE: 200 ohms
  • MAXIMUM INPUT SOUND LEVEL: 159 dB SPL, 1 kHz at 1% T.H.D.
  • DYNAMIC RANGE (typical): 130 dB, 1 kHz at Max SPL
  • SIGNAL-TO-NOISE RATIO: 65 dB, 1 kHz at 1 Pa
  • PHANTOM POWER REQUIREMENTS: 11– 52V DC, 3.5 mA typical SWITCH Flat, roll-off
  • WEIGHT (MICROPHONE):5 g (0.5 oz)
  • WEIGHT (POWER MODULE): 90 g (3.2 oz)
  • DIMENSIONS (MICROPHONE):8 mm (1.49'') long, 12.2 mm (0.48'') maximum body diameter
  • DIMENSIONS (POWER MODULE): 92 mm (3.62") long, 18.9 mm (0.74") diameter
  • CABLE:0 m (13.1') long (permanently attached to microphone), 3.2 mm (0.13") diameter, 2-conductor shielded cable with HIROSE HR10-type connector
  • OPTIONAL INTERCHANGEABLE ELEMENTS: UE-H hypercardioid (100°) UE-O omnidirectional (360°)
  • ACCESSORIES FURNISHED: ATM350a cardioid condenser microphone; AT8543 power module; AT8491U UniMount® universal clip-on mount; AT8490 UniMount® 5" gooseneck; AT8468 violin mount (hook-and-loop fastener); protective carrying case

This rugged UniMount® 9" gooseneck provides strong yet flexible support for the ATM350a Cardioid Condenser Instrument Microphone, so you can position the mic where you want it and be confident that it will stay there. An integral foam windscreen entirely surrounds the microphone. The AT8490L can be used with the AT8491U Universal Clip-on Mount, AT8491P Magnetic Piano Mount, AT8491D Drum Mount and AT8491W Woodwind Mount. 


  • 9” long
  • Flexible microphone positioning
  • Excellent durability and stability
  • Ideal for larger instruments

The AT8491S surface mount allows you to use an ATM350a Cardioid Condenser Instrument Mic and accompanying gooseneck with accordions and other instruments with challenging mounting surfaces. The notched mount can be attached permanently using the accordion’s grille screw and the included adhesive silicon pad, or it can be attached temporarily using the included fastener tape pads. A transparent protective film is also included to prevent damage to the instrument’s finish. Mount includes a socket with locking screw to securely hold an AT8490 5" or AT8490L 9" gooseneck.


  • Fits Audio-Technica Case Style(s): M36
  • Designed for accordions and other difficult applications
  • Extender mounting accessories included
  • AT8475 surface mount kit included

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