ES-6, front ES-6

The ES-6 is the counterpart to the ES-3 Lightpipe/CV Interface, offering up to 8 channels of CV input with output via an optical lightpipe connection. As with the ES-3, the ES-6 also works well for audio signals, with conversion quality on a par with a regular audio interface (see here or here).

The ES-6 itself has 6 input sockets; the remaining 2 channels are provided by an expansion module e.g. the ES-7.

Please note that a connected ES-3 or ES-8 is required for operation. The ES-6 gets its clock signals from the ES-3 (which derives them from its lightpipe input) or ES-8 (which has an internal clock).

Expert Sleepers ES-6 demo on Vimeo.

Expert Sleepers ES-7 CV To MIDI demo on Vimeo.


The ES-6's specifications are as follows:

  • Panel width: 4HP
  • Module depth: 50mm
  • Sync input: connection from ES-3 or ES-8 module
  • Analogue inputs: 6x 3.5mm jacks, DC-coupled
  • Input voltage range: ±10V
  • Input impedance: 100k
  • Digital output: optical, ADAT Lightpipe standard
  • Expansion
    • Header for connecting expansion modules e.g. the ES-7
  • Current draw: 182mA on the +12V rail, 53mA on the -12V rail

For more detail, please see the user manual.

ES-6 mk3

November 2022 sees the launch of the "ES-6 mk3". In other respects identical to the mk2, the mk3 includes these improvements:

  • Jumpers on the PCB to allow DC coupling to be enabled or disabled for each stereo pair of inputs
  • Enhanced audio performance

ES-6 mk2

February 2017 sees the launch of the "ES-6 mk2". Functionally equivalent to the original ES-6, the mk2 adds these improvements:

  • Illuminated jack sockets
  • Less HP
  • Less deep


The ES-6 is available now.

For purchasing links, please see the store.

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