Expert Sleepers ES-9 New King of the USB-Audio Interfaces for Eurorack

  • By: Thorsten Meyer
  • Date: Monday, 16 September 2019
  • Time to read: 2 min.

Expert Sleepers Announced ES-9

The ES-9 is a Eurorack 16-in/16-out USB audio interface, with DC-coupled inputs and outputs that can be used for both audio and CVs. With its balanced 1/4″ main outputs & headphone socket, it’s the perfect one-stop solution for integrating a modular synth and a laptop/tablet, either in the studio or when playing out at a gig.

Expert Sleepers ES 9 Side

The ES-9’s 14 analog inputs allow simultaneous tracking or mixing of a large number of sound sources in your modular, while the 8 DC-coupled outputs are perfect for controlling the modular with Silent Way, Max/MSP, Abelton’s CV Tools or similar, or for sending audio out to the modular for processing.


For even more outputs (up to 48 more), the ES-9 can be expanded with the ES-5*. It also has a pair of S/PDIF sockets for connecting other digital audio gear. The ES-9 also provides a pair of MIDI sockets (via a breakout).

 ES-9 Specifications 

  • Panel width: 16HP
  • Module depth (including power cable): 50mm
  • Current draw: 451mA on the +12V rail, 133mA on the -12V rail (at 96kHz)
  • USB socket: Type C
  • Driver support: class-compliant USB 2.0 (no driver required for macOS and iOS – Windows drivers provided for Windows 7, 8 & 10)
  • Channel count: 16 in, 16 out
  • Supported sample rates: 44.1kHz, 48kHz, 88.2kHz, 96kHz
  • Audio sample depth: 24 bit
  • Analog outputs:
    • 8x 3.5mm TS jacks, DC-coupled, Maximum output voltage approximately ±10V
    • 2x 1/4″ TRS balanced jacks, AC-coupled (main outs)
    • 1x 1/4″ TRS stereo jack, DC-coupled (headphones)
  • Analog inputs:
    • 14x 3.5mm TS jacks, DC-coupled, Input voltage range approximately ±10V
  • Digital I/O: 1x S/PDIF input (TOSlink), 1x S/PDIF output (TOSlink)
  • MIDI I/O: 1 input, 1 output (on the breakout)
  • Expansion headers: 1 for ES-5, 1 for MIDI breakout
  • Panel controls: headphone volume
  • Internal mixer: 8×8 crosspoint mixer

Availability and Pricing

The ES-9 eurorack module should be in stores early October 2019. MSRP: UK £499, US $569 (exclusive of sales tax), EU €469 (exclusive of VAT)

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Expert Sleepers ES 9 Side