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Project financed by the “Neustart Kultur” program – (Bundesministerium für Kunst und Kultur) in 2022.

OTTOsonics Website in Alter Bauhof


OTTOsonics is a collective project by sound-artists, developers, scholars and sound engineers working on accessible audio technologies for immersive sound creation. Putting the focus on the needs of performance artists as well as non-specialized cultural and educational institutions, our objective is facilitating the use of immersive audio. Currently Ottosonics is based in Ottensheim (Austria) and collaborates with the Tangible Music Lab, University of the Arts Linz.

OTTOsonics is an open platform for artists to address barriers to incorporating immersive sounds in all disciplines of arts and performances, to exchange technical and creative methods from production to implementation, and to share artistic and technological know-how across the field of acoustic and electronic music. OTTOsonics has developed its own high quality open hardware and software ecosystem: 3D printed speakers, multichannel amplifiers, power supplies, hardware adaptors, controllers, enclosures, etc. Our designs and solutions are open access, well documented and they do not require high technical knowledge or skills.

OTTOsonics offers residency programs, concerts, lectures, workshops and a festival!

General Technical Description

Speaker design


Amplifier and PSU design with assembly instructions


Speaker Systems at our venues

  • Alter Bauhof:
    1. 35.3-channel half dome (12 at 0°, 12 at 30°, 6 at 60°, 4 at 75°, 1 at 90°; 4m radius, 3 studio subwoofers)
    2. 22-channel rectangle with 4 speakers/channel (10x12m, 6x 18″subs)
    3. 20-channel ceiling speakers (4 x 5 meters grid)
    4. 4x line array with 6 speakers
    5. Outdoors 20.1 speaker full sphere (3m radius) on a sculpture by Andreas Buttinger Caspar
  • Tangible Music Lab, University of Arts Linz:
    • A 23.1 speakers dome: 2.5 meters radius: 12 speakers at 0°, 6 speakers at 33°, 4 speakers at 52°, 1 speaker at 90° plus 1 subwoofer.
    • 20.1 Dodecahedron (2m radius). Speakers in joints.

Other Speaker systems people have built

Practical Knowledge on Ambisonics

AVB Volume Controller

At our AVB system we missed a native volume controller so we programmed one using a ESP32. Everything we did is explained at this github page. If you want to 3D print the enclosure the STL files are also here.

Ambisonics Room IR

Calculate an ambisonics room impulse (4 channels or more) response with our python code: https://github.com/ultranoise/IR-multichannel

Activities and deliverables:

  • Residency by Marian Gviniashvili
  • Lecture by Mariam Gviniashvili at the Tangible Music Lab.
  • Ottosonics 3D-printed speaker design https://www.thingiverse.com/thing:5398696
  • Tutorial on how to develop DIY controllers for the open source audio network protocol AVB: https://github.com/ultranoise/MOTU_AVB_ESP32_Controller
  • Residency by Ida Hiršenfelder
  • Lecture by Ida Hiršenfelder at the Tangible Music Lab.
  • Presentation and Workshop at Ars Electronica Festival 2022
  • Residency by Stefan Juster & Robert Schwarz
  • Festival Ottosonics
  • Residency Amélie Niles
  • Lecture by Amélie Niles at the Tangible Music Lab
  • Prof. Martin Kaltenbrunner presents the Tangible Music Lab and Ottosonics at a masterclass at TU Praha (9.12.2022).
  • Ottosonics Meetups monthly since October 2022 and ongoing!
  • Åke Parmerud: guest lecture (tamlab) + artist in residence & concert (Alter Bauhof)
  • George Rahi: guest lecture (Tangible Music Lab) and concert (Alter Bauhof)
  • Musrara School of Arts Jerusalem: workshop, presentation and technical assistance for setting up a 6+3+3 speaker rig plus teaching spatial audio to students.
  • Klangfestival 2023, July 2023. 32 channels installation and program.
  • 2nd Festival Ottosonics, Alter Bauhof Ottensheim (16-17 September 2023)
  • Festival IZIS Koper Slovenia (September 2023).
  • Workshop University Saint Joseph Macau (19-23 February 2024) and installation of a 32 channels system.
  • Publication and sounding future magazine: https://www.soundingfuture.com/de/artikel/ottosonics-spatial-audio-als-neues-normal