Sound Devices A20-TX Digital Wireless Bodypack Transmitter, 169-1525MHz
Meet the A20-TX transmitter and A20-Nexus Go receiver
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Sound Devices A20-TX Digital Wireless Bodypack Transmitter, 169-1525MHz

SKU: SDA20TX MFR: A20-TX
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Key Features

  • Capture pristine audio with this Sound Devices wireless transmitter, ensuring top sound quality.
  • Experience flexible connectivity; this wireless microphone system supports balanced mic and line inputs.
  • Enjoy extended battery life, up to 12 hours, with this digital wireless bodypack transmitter.
  • Remotely control settings via Bluetooth with the A20-Remote app for seamless adjustments.
  • Record directly to a micro SD card in 32-bit float for superior dynamic range and audio fidelity.
  • Utilize timecode I/O via USB-C for perfect synchronization in professional audio setups.
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Special Order?Estimated to Ship: 09/13/2025
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Sound Devices A20-TX Specifications

  • Frequency Range

    169 to 1525 MHz
    Transmitter tunable in 25 kHz steps
    Available frequencies are dependent on region

  • RF Output Power

    Off, Low - 2 mW, Normal - 10 mW, High - 20 mW, Extra High - 40 mW

  • Modulation Mode

    Proprietary, 100% digital RF modulation
    Standard or Long Range, selectable

  • Antennas

    UHF RF: SMA connector, removable antenna
    2.4 GHz built-in, bottom of unit

  • Audio Frequency Response

    10 Hz - 20 kHz, +/- 1 dB re 1 kHz

  • Audio Input

    Lavalier Microphone:
    2-wire- or 3-wire-type lavalier mics supported
    Auto-selected when lavalier mic connected to Lemo input
    Dynamic range: 130+ dB min, A-weighted
    Input clip level: 5V p-p (limited by lavalier microphone)
    Lemo pin 1 = ground; Lemo pin 2 = 5V bias power; Lemo pin 3 = audio/bias (8k to 5V internal)
    Auto unit power on/off with connection/removal of lavalier microphone (menu selectable)

  • Audio Input (Contd.)

    Balanced Mic:
    True, fully balanced, 8-Series mic preamp
    Dynamic range: 140 dB min, A-weighted
    Menu selectable with connection of XL-BALXLR-4 cable to Lemo input
    Phantom power: 12V or 48V, full 10mA available per IEC 61938
    XLR pin 1 = ground; XLR pin 2 = +; XLR pin 3 = -

  • Audio Input (Contd..)

    Line Input:
    True, fully balanced line-level input (no external resistors required)
    Input clip level: +26 dBu
    Menu selectable with connection of XL-BALXLR-4 cable to Lemo input
    XLR pin 1 = ground; XLR pin 2 = +; XLR pin 3 = -

  • Audio Input (Contd...)

    AES42:
    AES digital input with common mode power for Digital mics such as Schoeps SuperCMIT
    250mA current available
    Selectable audio channel 1 or 2 via menu
    Menu selectable with connection of XL-BALXLR-4 cable to Lemo input
    XLR pin 1 = ground; XLR pin 2 = +; XLR pin 3 = -

  • Audio Input (Contd....)

    AES3:
    AES digital input without common mode power
    Selectable audio channel 1 or 2 via menu
    Menu selectable with connection of XL-BALXLR-4 cable to Lemo input
    XLR pin 1 = ground; XLR pin 2 = +; XLR pin 3 = -

  • Audio Input (Contd.....)

    Guitar:
    Auto-selected when connected with A20-TX Smart Guitar Cable
    1/4" tip = + 1/4" sleeve = ground
    18V p-p max input level
    Input impedance: 100k, 1M, 10M (menu selectable)
    Cable capacitance: 0 pF - 3000 pF in 50 pF steps (menu selectable)
    Balanced connection from 1/4" plug to Lemo for low noise susceptibility

  • Menu and Controls

    e-Paper screen highly visible in direct sunlight
    e-Paper screen keeps display even with no batteries
    Power/Pair button and three navigation buttons protected inside battery compartment
    Optional user-programmable bayonet switch for top of transmitter (A20-TX Switch)

  • Remote Control

    A20-Remote Android, iOS, and iPad app via Bluetooth 5.2 LE
    A20-Nexus, A20-Nexus Go receivers via super-long-range NexLink

  • Recording Media

    Micro SD card

  • Recording File Format

    32 Bit Float, 48 kHz, Monophonic
    Broadcast WAV (<4 GB), RF64 WAV (>4 GB)

  • Timecode

    Input via XL-TC-USBC-LEMO, XL-TC-USBC-BNC, USB-A to USB-C (from 8-Series) or wirelessly over NexLink (from A20-Nexus/A20-Nexus Go)
    LTC: 0.3 V - 3 V p-p (-17 dBu to +3 dBu), 20k ohm impedance
    LTC Output via XL-TC-USBC-LEMO: 3 V p-p, 400 ohm impedance

  • Timecode Clock

    0.2 ppm accuracy
    Holds accurate clock for four hours while powered down with batteries inserted, holds for one hour without batteries via internal supercapacitor
    Auto Jams timecode via USB-C connector or wirelessly via NexLink

  • Timecode Frame Rates

    23.98, 24, 25, 29.97 DF, 29.97 ND, 30 DF, 30 ND
    Frame rates are auto-detected from incoming source

  • USB-C

    Mass Storage (USB-C): USB 2.0 high speed for file transfer
    Charges Li-ion and LiFePO4 batteries inserted in A20-TX
    Pairing to A20-Nexus, A20-Nexus Go
    Timecode I/O

  • Powering

    "1.5V" Alkaline, Lithium primary, NiMH AA batteries; 3 for operation
    "3.7V" Rechargeable Lithium-Ion, Rechargeable LiFePO4 AA batteries; 1, 2, of 3 for operation
    Energizer Ultimate AA primary cells recommended for longest runtime

  • Battery Charging

    Built-in charging of Lithium-Ion and LiFePO4 batteries via USB-C

  • Battery Runtime

    Up to 12 hours (depending on battery chemistry, number of batteries, RF power, input type, mode)
    Unit can be completely powered off remotely via app or via NexLink to extend battery runtime

  • Environmental

    Operating: 14 Degree F to 100.4 Degree F (-10 Degree C to 38 Degree C)
    Storage: -40 Degree F to 185 Degree F (-40 Degree C to 85 Degree C)
    0 to 90% relative humidity (non-condensing)

  • Battery Info

    Required, not included

  • Battery Material

    Alkaline

  • Battery Type

    AA

  • Battery Quantity

    3

  • Dimensions (H x W x D)

    3.3 x 2.5 x 0.71" (8.5 x 6.4 x 1.81cm)

  • Weight

    3.2 oz (90.7g) (Without batteries)

  • UPC Code

    850032705295

About Sound Devices A20-TX

After extensive research and development, Sound Devices presents the A20-TX Digital Wireless Bodypack Transmitter, a versatile and innovative audio solution. This advanced device is designed to serve multiple purposes, making it an essential tool for audio professionals seeking flexibility and reliability.

The A20-TX transmitter is compatible with a wide array of input sources, including two- or three-wire lavs, dynamic mics, phantom-powered condenser mics, guitars, balanced line-level sources, and even AES digital mics. This multipurpose input capability eliminates the need for additional transmitters, streamlining your audio setup and reducing the amount of equipment you need to carry or rent.

One of the standout features of the A20-TX transmitter is its true balanced ultra-low-noise, high-headroom mic preamp. This industry-first feature, also found in our renowned 8-Series mixers, offers superior noise reduction, headroom, and sonic purity compared to the mic preamp in the original A10-TX transmitter.

The A20-TX transmitter also boasts an impressive battery life of up to 12 hours. Its flexible powering scheme accommodates a variety of battery types, including standard alkaline or NiMh AA batteries, rechargeable Li-Ion batteries, rechargeable LiFePO4 batteries, or even USB battery packs.

Equipped with Sound Devices' proprietary NexLink 2.4 GHz long-range wireless remote control technology, the A20-TX transmitter can be controlled and timecode synced from an A20-Nexus or A20-Nexus Go digital receiver, even over long distances and through Wi-Fi, Bluetooth, and other 2.4 GHz interference.

The A20-TX transmitter also features Sound Devices' proprietary SpectraBand technology, enabling it to tune over a super wide frequency range of 169-1525 MHz. This broad range ensures maximum compatibility with other audio equipment and wireless systems.

For applications requiring a user-actuated switch, the A20-TX transmitter includes the industry's first physically removable switch. Its large size, positive tactile operation, and magnetic activation provide users with ultimate confidence and reliability.

The A20-TX transmitter's GainForward feature eliminates the need for gain setting on the transmitter. You can control your A20-TX transmitter's audio gain directly at the mixer's digital trim control or at the wireless receiver, ensuring optimal audio performance.

Finally, the A20-TX transmitter's e-Paper Display allows for easy viewing of settings and menus, even in sunlight or when powered down. The screen's backlight turns on for easy visibility when you open the battery door, making it simple to change settings in the dark.

In summary, the A20-TX Digital Wireless Bodypack Transmitter is a durable, high-quality, and reliable device that offers advanced features and innovative technology for all your audio transmission needs.

Sound Devices A20-TX Features

  • Worldwide VHF and UHF tuning range from 169 MHz-1525 MHz
  • Up to 12 hours battery runtime
  • Eco-friendly operation from rechargeable Lithium batteries or from standard AA batteries
  • Built-in battery charger via USB-C
  • Full remote control of the A20-TX via A20-Remote companion app and from A20-Nexus and A20-Nexus Go via long-range NexLink
  • State-of-the-art 100% digital long-range modulation delivers the longest transmission distance of any system on the market
  • RF Power output from 2 mW to 40 mW
  • Lemo input supports 2-wire or 3-wire mono lav, balanced mic, switchable 12, 48V phantom, balanced line-level, AES3, AES42 (compatible with Schoeps SuperCMIT), and guitar (w/ optional Smart Guitar Cable)
  • GainForward Architecture - no gain control to worry about on the A20-TX
  • Full 10 Hz - 20 kHz audio bandwidth
  • 8-Series, fully balanced mic preamp built in (140 dB dynamic range)
  • Ultra-quiet lavalier mic preamp (130+ dB dynamic range)
  • Built-in 32-bit float, 48 kHz recorder with removable micro-SD card
  • Ultra-stable timecode built in, auto jammed via wireless NexLink
  • Sunlight-readable e-Paper screen for control and display. Display persists when powered off
  • USB-C for pairing with the A20-Nexus, file offload, charging, and timecode jamming
  • A20-TX Switch: Optional user-programmable bayonet switch, magnetically sensed and physically removable

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Product Documents

User Manual

Key Features

  • Capture pristine audio with this Sound Devices wireless transmitter, ensuring top sound quality.
  • Experience flexible connectivity; this wireless microphone system supports balanced mic and line inputs.
  • Enjoy extended battery life, up to 12 hours, with this digital wireless bodypack transmitter.
  • Remotely control settings via Bluetooth with the A20-Remote app for seamless adjustments.
  • Record directly to a micro SD card in 32-bit float for superior dynamic range and audio fidelity.
  • Utilize timecode I/O via USB-C for perfect synchronization in professional audio setups.

What's in the box:

  • Sound Devices A20-TX Digital Wireless Bodypack Transmitter
  • Straight Antenna (470-548 MHz to SMA)
  • Straight Antenna (548-638 MHz to SMA)
  • Straight 17" Uncut Astral VHF Whip Antenna (SMA)
  • 3x Antenna Caps
  • Belt Clip
  • (Batteries & micro SD Card Not Included)
  • Sound Devices 1 Year Limited Warranty (Extended 1 Year Warranty with Online Registration)