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Expert Sleepers ES-8

¥75,900 (Tax excluded ¥69,000)
12IN / 16OUT USB audio interface module! CV input / output is also fully supported. Also equipped with a mode that operates like the ES-3

Format: Eurorack
Width: 8HP
Depth: 52mm
Current: 198mA @ + 12V, 52mA @ -12V
Manufacturer's official Japanese page
Japanese manual page
Manual (English)

The deviation of the meter seen when connected to a DAW etc. is a specification.There is no problem in practical use.See the section "About DC" Noise "in your DAW Meter" for more information.


ES-8 is USB 2.0 class compliantAudio interface moduleis. 12 inputs and 16 outputs are possible by adding ADAT input / output. Input and output are DC couplingInput and output of both CV and audioSo, it is directly compatible with computer-based CV generation software such as Silent Way, Max / MSP, Reaktor, Ableton CV Tools, Audulus and iOS apps (we do not sell or support these software). ES-8 hasADAT input / outputBecause there is ADATES-3If you connect it toES-6,ES-7You can extend the input by connecting to. Of course, ADAT devices other than modular can also be connected.

When not connected via USB, the ES-8 is not an audio interfaceStandalone modeAnd operates as an AD / DA converter module that converts ADAT input / output and analog signals.
  • Number of input / output channels: Input x12, output x16
  • Sample rate: 44.1kHz, 48kHz, 88.2kHz, 96kHz
  • The ES-8 has a high quality clock and can optionally be synchronized with the clock from the ADAT input.
  • Audio sample: 24 bit
  • Output Jack: 8x3.5mm TS Jack, DC coupled output
  • Maximum output voltage: approx. +/- 10V DC
  • Analog Input Jack: 4x3.5mm TS Jack, DC coupled input
  • Input voltage range: approx. +/- 10V
  • Digital input / output: 1xADAT input, 1xADAT output
  • Expansion header: 1xES-5 socket, 1xES-6 socket
  • USB socket: Type B
  • Driver support: USB2.0 (no driver installation required for macOS and iOS, Windows 7,8,10 Windows driverClick here for the guidelines.Please download from and install. )


The explanation of each part will pop up when the mouse is over

About DC "noise" seen in DAW meters

When connecting the ES-8 to a computer and monitoring the input, a non-zero level is displayed even though there is no input as shown in the image below.

This is a DC (constant voltage) component due to the ES-8's input being DC-coupled, but the DAW's meter overestimates this and displays it, so in practice it doesn't matter. You can use it.This is explained below.

First, when evaluating the level of this DC signal, the meter level in dB is about -48dB, which is about 0/256 of the 1dB signal when converted to a level ratio. Since 0dB corresponds to 5V, the DC at which the meter is -48dB is 5V/256 = about 0.02V.Also, the image above shows the waveform of the clip, and you can see that it's straight in the center.

I understand that -48dB is a signal with an amplitude of about 0.02V, but how big is this?If this signal is audible, even at a level of about 0.02V, the human ear can perceive it as noise different from what was originally intended to be recorded.So the DAW's meter scale is set to match the auditory level of such a -48dB signal and gives the correct indication if you are evaluating a sound signal.

But if the input is not a sound but a static DC, the level on this meter will not reflect reality.First of all, since it is DC, it does not exist as a sound.Another conceivable effect is that when it is mixed with the original input signal, it interferes with it, causing deformation or distortion of the input signal. It has almost no effect (unless you put in a very loud signal).

To summarize the above,

  • The DAW meter is a scale that evaluates the signal as sound, and evaluates the input assuming that the signal is audible. Since -48dB is loud enough to be heard if it is a sound, it is displayed as a signal of a reasonable magnitude (like an image) on the meter.
  • However, since it is a DC that is not actually a sound, it cannot be heard by itself.
  • There is no problem because the offset is about 0.02V even if it is seen as a signal that interferes with the original input.

It means that.Please use with confidence.