zSum-4 - Stereo Summing Mixer PCB/Panel | Motovilo

The Motovilo zSum-4 is an analog stereo summing mixer in euro modular format with dual servo dc removal technology.

This is a PCB/Panel set in the Eurorack format.

Availability: In stock




Analog stereo summing mixer in euro modular format with dual servo dc removal technology.

Main features:

  • Two mixing stages both channels.
  • The shortest signal path.
  • No coupling capacitors in the signal path.
  • Efficient removal of DC component through servo amplifiers in each mixing stage.
  • Improved usability, expandable, linkable.
  • Carefully designed high quality PCB’s.
  • Solid, powder-coated aluminum industrial panel.


  • Main inputs:               10 (5 stereo pairs)
  • Auxiliary inputs (inverted) for FX return and linking:   (2 stereo pairs)
  • Auxiliary outputs (inverted) for FX send and linking:    2 (1 stereo pair)
  • Main outputs:           (1 stereo pair)
  • Monitoring outputs: 4 (2  stereo pairs) switchable between main and AUX out.
  • Input impedance: 22kOhm
  • Output Impedance: LOW (Near zero) in normal operations, 220 Ohm in short circuit.
  • Mutable front panel inputs.
  • PAD -12dB buttons in each mixing stage.
  • Unity gain  when not pressed PAD buttons.
  • Form factor: Euro modular.
  • Сonsumption current: 20mA
  • Width:  10hp (50.5mm)
  • Depth– 45мм (30mm without rear connectors)

Specs & Downloads

Specs & Downloads

Manufacturer Motovilo
HP 10
Depth 45mm
+12V 20mA
-12V 20mA
+5V No
Additional Resources All values printed on the PCB!


Customer Reviews (1)

great clock - clean signal, easy to build.Review by Mitch
I've been assembling modules for about 3 years now, so I'm still a bit of an amateur. There were no assembly instructions for this, but the PCB is well labeled, and there weren't many assumptions to be made in assembly. It worked immediately once completed, though you do have to set the trim potentiometer on the PCB to get the LED display backlighting correct. I did reach out to the manufacturer, and they wrote back promptly (I had a question about the pinout on the LED display). (Posted on 7/2/2018)

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