Omnissiah is the desktop app for room correction and speaker control on your Tantrum Audio Really Mean Sub. Before you start, read the safety notes below and skim the conventions this guide uses — every task later on is written as plain, numbered steps.
Legal & safety
Copyright. © Tantrum Audio. All rights reserved. “Omnissiah”, “Really Mean Sub” and “Tantrum Audio” are names of Tantrum Audio and its products. All other trademarks are the property of their respective owners.
Disclaimer. This guide describes the app as it behaves at the version it was synced with. Features marked beta or coming soon may change. We've done our best to keep every number and menu path accurate, but if the app and this guide disagree, the app is right — please tell us (see Appendix D — Support).
Protect your hearing
Room correction and level-setting play test noise (pink noise) and can drive your speakers loud. Before you start, follow the precautions below.
- Turn your amplifier/interface volume down first, then raise it gradually.
- Never stand close to a speaker while a sweep or test tone is playing.
- Sudden loud sounds can damage hearing and equipment. If something sounds wrong, stop the measurement (there is always a Stop button on screen).
About this guide
This guide is for owners of a Tantrum Audio Really Mean Sub using the Omnissiah desktop app to set up, measure and correct their system. You don't need to be an audio engineer — every task is written as plain, numbered steps with a picture. Sections that go deeper are clearly marked Advanced (optional); you can skip them and still get a great result.
The app's name
The app is called Omnissiah. That's the name you'll see on its icon in your Applications folder and in the dock. Some in-app text and older documents call it “DSP Control” — it's the same app. This guide uses Omnissiah throughout.
How this guide is organised
- Part I – Overview — what the app does and how to install it.
- Part II – Getting started — the fastest path from unboxing to good sound, plus a tour of the screen.
- Part III – Task reference — one chapter per job: managing devices, shaping sound, measuring, room correction, results, backup, settings.
- Part IV – Advanced — fine-tuning room correction, custom target curves, diagnostics.
- Part V – Help — troubleshooting, a glossary, and reference appendices.
New users should read Parts I–II in order. If you already know your way around, jump straight to the Part III chapter for the task you want.
Conventions used here
| Style | Meaning |
|---|---|
| Bold | A button, menu, or label you see on screen, written exactly as it appears — e.g. Start Noise, Take Snapshot. |
| Italic | A term being introduced, or a value you type. |
| Code | A file name, path, or exact value. |
| 1. 2. 3. | A procedure — do the steps in order. |
Helpful shortcuts and good-to-know extras.
Background detail or a clarification.
Something that could damage hearing, equipment, or lose your work.
Screenshots show the app in its dark theme (the only theme). Yellow is the app's accent colour; the highlighted control in a picture is usually the one the step refers to.
