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ADVANCED -TRANSITION HORNS
 by Marcel Batík


High-performance devices for sound reproduction
DIY kits



ATH Gen2
/ Long Adapters 		True-CD WG Tritonia TwinRay




All STL kits via Cults


Work on horns:
[1]OS-SE Waveguide (pdf)
Novel profile formula for baffle-mounted horns, 2020.
[2]R-OSSE Acoustic Waveguide (pdf)
New parametric formula for low-diffraction, free-standing horns, 2022.
[3]Spherical Wave Forming (pdf)
Apparatus for flat-to-spherical wavefront transformation for constant directivity, 2021.
[4]Extended-Throat Waveguides
Technical Note, 2023.
[5]EXAR Waveguides - Segmentizing a horn
Analytic method of separation of axisymmetric horns into segments, 2024.




Associated diyAudio threads: Theory & Design | Practicalities
Interactive waveguide formulas in Desmos calculator: OSSE | R-OSSE


Update History (since 2025, newest first)

2025-10-04 ATH TwinRay waveguides
2025-09-30 Ath Commercial licence available
2025-09-26 Tritonia-M System4 kit available
2025-08-26 Tritonia-M rev2 waveguide kit added
2025-07-28 Gen2 adapter for BMS 4526HE added
2025-06-27 Gen2 adapter for TAD TD-4002 (1.5") made available
2025-06-03 Ath software version updated
2025-05-29 Tritonia-F / full-scale 1" version added
2025-05-03 Tritonia-XS waveguide added
2025-04-21 T520-ESP-50 / 2" shaping-plug adapter set for Gen2 horns (updated)
2025-04-03 A620G2 waveguide kit
2025-03-16 T520-1720 / Gen2 throat adapter for Celestion CDX1-1720
2025-02-10 T520-760 / Gen2 throat adapter for Radian 760NeoPB
2025-02-18 Tritonia waveguide kits
2025-01-13 Gen2 long-throat adapter for BMS 5530ND





ATH software tool (zip package, the latest release, free for non-commercial use)
User Guide

For commercial use you can get a key file:
ATH KEY via Cults

Note: As the project grew, there are many features undocumented in the User Guide.
The only place where to find them documeted is the diyAudio thread.