Otto Passive Mono User Manual

Table of contents

  1. Overview
  2. Front panel layout
  3. Functional description
  4. Pin mapping on the backside
  5. Technical details
  6. Installation
  7. More information
  8. Warranty


Congratulations to the purchase of Otto Passive Mono and welcome to the world of manikk!

manikk Otto Passive Mono is an 2HP module that can be used in several use cases:
  • Passive multiple where you can create your own splits
  • Patch bay
  • Input/output module with normalizations
  • DIY
  • Front-panel for your own creations
  • See here for more inspiration
On the back there is a pin-strip with access to all jacks signals and break/normalizing-signals. The first versions included a 15 pin female header that could be used to create passive multiples when attached to the pinstrip at the back of the Otto Mono. New versions have seven solder-pad-switches instead. You can solder each of these solder-switches to connect two nearby jacks, for example 1 and 2. With these solder-switches you can easily create passive multiples from 2 jacks connected, up to all 8 jacks connected. You can create any combination of groups with nearby connected jacks. No cables are included. Read the manual for more information. There is also a Stereo-jacks version called Otto Passive Stereo. See here how to attach stickers to the front. See also the FAQ for more tips and tricks.

Package Contents

  • 1 Module
  • 15 pin female header for making a 4+4 passive multiple (not included on newer versions that have solderpads instead)
  • 2 Screws
  • 1 Sticker sheet
  • Plastic zip bag

Click here to go to the product page.

Front panel layout

Functional description

The Otto Passive Mono is a completely passive module.

It has 8 mono jacks on the front and a pin-strip on the back with access to all jack signals.

For each jack you will find pins for the main signal and a break/normalization signal.

Each mono jack has a break- or normalization-function. When no connector is inserted in the jack on the front, the main-jack-signal is also sent out to the break/normalization pin. But if a connector is inserted, nothing is sent out on the break/normalization pin.

The GND for all jacks and pins are connected to the same ground-plane. That ground-plane is also connected to the front and the jack screws. When you install the module in your rack, it will also be grounded to your rack.

The module can be used in many use-cases where you need mono-jacks with the connections freely accessible at the back.

Pin mapping on the backside

Pin Function
1 Jack 1 signal
3 Jack 2 signal
5 Jack 3 signal
7 Jack 4 signal
9 Jack 5 signal
10 GND
11 Jack 6 signal
12 GND
13 Jack 7 signal
14 GND
15 Jack 8 signal
16 GND
17 Jack 1 break/normalization
18 GND
19 Jack 2 break/normalization
20 GND
21 Jack 3 break/normalization
22 GND
23 Jack 4 break/normalization
24 GND
25 Jack 5 break/normalization
26 GND
27 Jack 6 break/normalization
28 GND
29 Jack 7 break/normalization
30 GND
31 Jack 8 break/normalization
32 GND

Technical details


Width: 2 HP
Depth: 21 mm

Current consumption

+12V: No current consumption. Completely passive.



If you have purchased a module, you need to install it in your eurorack case. Use the supplied screws to mount it in your rack.

An expander or add-on needs to be attached to the back of a master module via pin-strips. Either directly or via dupont-cables.

Power supply

There are three types of power requirements for manikk products:

  • Completely passive products requires no power.
  • Normal eurorack modules requires +12V and -12V from your eurorack system. Connect with IDE ribbon cable.
  • Some kits and add-ons requires only +5V from a master module. Connect directly or with dupont-cables.


  • Make sure to use approved and good power supply in your system.
  • Always turn off the power to your system when installing or uninstalling modules.
  • Make sure to get the polarization correct when connecting cables.
  • When you connect an IDE flat ribbon cable to the eurorack power distribution, the negative -12V is normally indicated with text on the PCB and with a red stripe on the cable.

More information

You can find the latest information on the website

  • Latest version of this manual
  • Additional information
  • Videos
  • FAQ
  • Other modules and kits


This device has a one (1) year limited warranty starting from the first purchase date.

The warranty covers malfunctions in the device.

The warranty does not cover bad usage, external damage or other abnormal usage.

The device is designed to work in a Eurorack synthesizer system. Other uses are not covered by the warranty.

If you have to use this warranty you need to do the following:

  1. Check that the date is still in the warranty-time of 1 year from the date of purchase.
  2. Contact the seller where you purchased the device.
  3. Send the malfunctioning device to the address given by the seller. You have to pay for this freight yourself. Very important that you attach your return-address to the device, so we know where to return the repaired device.
  4. Manikk will repair or replace the device if the problem is covered by the warranty. We will send the repaired device back to you.