CHF 1'490.00

Ultra portable dual domain preamplifier – USB Sound Card

SKU: 044100 Categories: ,


The SX-M2D2 is all at once:

  • A very high quality stereo preamplifier
  • An analog-to-digital and digital-to-analog converter
  • A headphone and monitoring amplifier
  • A USB sound card compatible with any type of computer or smartphone
  • An audio mixer with an integrated full featured compressor-limiter.

An embedded digital matrix allows any input to be routed to any output or to an internal stereo mixer. The fully digital controls allow menu access to all features with only two rotary encoders. A high-brightness graphic display shows the available options and settings as well as four modulometers assignable in pairs to any signal source. The power supply from a standard battery, recharged in the device, guarantees hours of autonomy, even if the two power sources available to the SX-M2D2 are unplugged.

The possibilities of implementation are endless:

  • As a complement to a TV cinema recording equipment or as a small stand-alone mixer.
  • As an AD converter preamplifier for a boom operator, with the possibility of mixing talkback with local monitoring
  • For a radio journalist who will be able to record and monitor 2 mics interviews on his smartphone.
  • For the musician or podcast creator who wants to benefit from very high quality inputs and outputs on his computer (PC or Apple-Mac) or smartphone (iOs or Android).
  • For the audiophile who will benefit from a DA converter coupled with an exceptional headphone amplifier.

Key Features

  • Two mic/line analog inputs with 135dB dynamic range
  • Independent line and phones outputs
  • AES42/AES3 input, AES3 output
  • Two channels in/out USB audio 2.0
  • Powered by removable Li-ion battery, Hirose or USB with intelligent energy management

SX-M2D2 applications  are countless. Here are some examples:

Inputs / Outputs

  • 2x mic/line inputs on TA3, electronically balanced, with phase reversal, 48V phantom, LF cut and level control
  • 1x AES3/AES42 on TA3, transformer balanced input with phase reversal and level control
  • 1x line output on TA3, 2 channels analog unbalanced
  • 1x AES3 output on TA3, 2 channels transformer balanced with ASRC (48/96/192k)
  • 1x USB audio 2 channels input/output on micro USB type C connector
  • independent line/headphones stereo output on mini-jack


  • 135 dB (A-weighted) overall dynamic range
  • THD < 0.001%
  • 90 kHz overall frequency response @192kHz
  • 24-bit 48/96/192kHz


  • external DC 9-18V on Hirose 4-pin
  • external DC 5V on micro USB
  • removable 18650 lithium-ion battery cell, charged with external DC input
  • intelligent energy management
  • About 4.5 hours run-time with a full charged 11.5Wh battery and two Schoeps 48V microphones
The battery must be present in the device to ensure that all functions are always available.
The SX-M2D2 can be powered without a battery for a few moments when replacing a discharged battery with a charged one.

User Interface

  • 128×64 monochrome OLED display
  • two rotary encoders for gain control
  • 2 or 4 channels peak meters
  • intuitive menu navigation


  • Machined aluminum housing
  • overall dimension: 74 x 28 x 130 mm (2.9’’ x 1.1’’ x 5.1’’)
  • weight 336g (0.74lbs) with battery
  • mounting holes on both sides

sell sheet rectoverso

User Manual EN (v1.1)

User Manual_v1.2

Manuel d’utilisateur FR_v1.2

User Manual_EN v1.3

Manuel d’utilisateur FR_v1.3

User Manual – Electret (for SX-M2D2 from S/N 00300)

Windows ASIO Driver

This file is an ASIO USB class 2.0 driver valid for the following OS: Windows 7, 8, 8.1, 10 (32 & 64bit)


USB Audio Interface

Most recent Apple iPhone, iPad and Android devices work with the SX-M2D2.  This is a list of suggested apps. Please note that since these apps come from third party vendors, no support is provided for them.

  • Audio Evolution (iOS, Android)
  • TwistedWave Audio Editor (iOS)
  • Apogee Metarecorder (iOS)
  • Field Recorder (Android)

Apple iOS cable compatibility: the Apple USB-C to Lightning cable doesn’t work with the SX-M2D2. Supported cables are the Lightning to USB Camera or the Lightning to USB 3 Camera adapters.

Apple OSX version 10.6.4 and above, Windows 10 version 1703 and above and all (modern) Linux distributions natively supports USB Audio Class 2.0, no driver install is required.

FAT format tool for Microsoft Windows (for firmware update)

SX-M2D2 Cables

Batteries Charger – Power Bank 



DIY 3D files for SX-M2D2 Mounting accessory:






Sonosax provides two types of 3D print for your SX-M2D2.

Slide your SX-M2D2 into this box, protective case, mounting accessory, whatever you like to call it. Hot shoe fixing slides allow you to attach it to a camera. You may also slide it into your sound bag. The connectors are protected and the cables come out elegantly on the side.

Feel free to modify the original file according to your needs and ideas. And if you do, send us your photos, the most beautiful ones will be published on the website.

In each .zip file, you’ll find:

  • a Solidworks 2015 or later 3D file (.SLDPRT)
  • a .STL 3D printer file

Note: Sonosax does not provide this accessory in physical form. Only files for 3D printing are available.

Version 1.5 –  January 2021
Note: unzip archive and store file into your USB drive root folder

Here, the new software version for your SONOSAX SX-M2D2, V1.5

Like ALL new software, this one can contain some bugs, please, tell us immediately if you see something not normal, at


  • Fixed 48V enable bug at startup
  • Fixed outputs power down bug (no signal after a power cycle)

Version 1.4 – December 2020
Note: unzip archive and store file into your USB drive root folder


  • Fixed AES output power down bug
  • Fixed power down event parameter (wasn’t restored after a power cycle)

Version 1.3 – October 2020
Note: unzip archive and store file into your USB drive root folder


  • Fixed crashes when changing sample frequencies
  • Fixed and improved pop noise when switch frequencies

Version 1.2 – July 2020
Note: unzip archive and store file into your USB drive root folder


  • The SX-M2D2 crashes when changing sample frequency


  • Fixed power source in menu power
  • Fixed LF CUT (could be incorrect after a power cycle)
  • Modified output level range to [MUTE, -60..+24dB]
  • Enhanced rotary encoders parameter modification
  • MIC/Line, AES and USB inputs menus full redesign
  • Added input delays
  • Added line out balanced (mono) mode

Version 1.1 – December 2019
Note: unzip archive and store both files into your USB drive root folder


  • Menu POWER: power source indicates BATTERY even when powered from USB or Hirose


  • Fixed output level issue in phones output (only under rare circumstances)
  • Fixed encoders push and long push events (was inverted in right navigation mode)
  • Fixed main screen rotary encoders: they can now be driven simultaneously
  • Modified dynamic mic preset (id 2) default input gain value (set to +30dB)
  • Added power management: device can be shutdown on Hirose unplug event or encoders long press (see POWER/SETUP menu)

Version 1.0 – October 28 2019 SX-M2D2