# Tantrum Audio

> Tantrum Audio builds studio monitors (Angry Box), subwoofers (Really Mean Sub), the Omnissiah room-correction and DSP control app for macOS, and audio plugins. UK-based; ships worldwide.

## Products

- [Angry Box](https://tantrumaudio.co.uk/angrybox): point-source studio monitor
- [Really Mean Sub](https://tantrumaudio.co.uk/reallymeansub): DSP-controlled subwoofer, calibrated by Omnissiah
- [Omnissiah](https://tantrumaudio.co.uk/omnissiah): room correction & speaker control app (macOS)
- [GROT](https://tantrumaudio.co.uk/plugins/grot): speaker-degradation distortion plugin (macOS, AU/VST3/AAX)
- [Shop](https://tantrumaudio.co.uk/shop): all products and accessories

## User Manuals

- [All user manuals](https://tantrumaudio.co.uk/usermanuals): hub for every product guide

### Omnissiah User Manual (app version 0.1.3)

The complete manual, one page: [scroll-through version](https://tantrumaudio.co.uk/usermanuals/omnissiah). Full text as Markdown: [llms.txt dump](https://tantrumaudio.co.uk/usermanuals/omnissiah/llms.txt). PDF: [/omnissiah/Omnissiah-User-Manual.pdf](https://tantrumaudio.co.uk/omnissiah/Omnissiah-User-Manual.pdf). Per-chapter pages:

- [Preface](https://tantrumaudio.co.uk/usermanuals/omnissiah/preface): Safety information, who this guide is for, and the conventions used throughout the Omnissiah user manual for the Tantrum Audio Really Mean Sub.
- [Introduction](https://tantrumaudio.co.uk/usermanuals/omnissiah/introduction): What Omnissiah is for, the parts of your Really Mean Sub system it controls, and the measure → correct → apply loop that gets you great sound.
- [System requirements & installation](https://tantrumaudio.co.uk/usermanuals/omnissiah/installation): What you need to run Omnissiah on your Mac, how to install and launch the app, and how to allow microphone access for room measurement.
- [Quick start](https://tantrumaudio.co.uk/usermanuals/omnissiah/quick-start): The shortest path to corrected sound in about 15 minutes: set up playback on a Tantrum device or through loopback, measure your room, review and apply.
- [Interface tour](https://tantrumaudio.co.uk/usermanuals/omnissiah/interface-tour): Find your way around Omnissiah: the sidebar, output list, Home screen, and where every task lives, from firmware updates to room correction.
- [Managing devices](https://tantrumaudio.co.uk/usermanuals/omnissiah/managing-devices): Connect your Tantrum Audio DSP device over USB-C, identify it, run over-the-air firmware updates, and factory-reset it when you need to.
- [Outputs & channel setup](https://tantrumaudio.co.uk/usermanuals/omnissiah/outputs-and-channels): Select an output to adjust, link two outputs so EQ, crossover and level move together, and choose which controls stay independent.
- [Shaping sound — the DSP blocks](https://tantrumaudio.co.uk/usermanuals/omnissiah/shaping-sound): Set gain, delay, crossover and parametric EQ on any output by hand in Omnissiah, the manual counterpart to automatic room correction.
- [Measuring your system](https://tantrumaudio.co.uk/usermanuals/omnissiah/measuring): See how your speakers actually measure in your room with Omnissiah's real-time measurement screen: capture snapshots, compare them, and export them.
- [Room correction & calibration](https://tantrumaudio.co.uk/usermanuals/omnissiah/room-correction): Measure your speakers in the room and let Omnissiah calculate correction filters aimed at a target sound, from setup to a finished calculation.
- [Understanding & applying results](https://tantrumaudio.co.uk/usermanuals/omnissiah/results): Read the Calibration results page: compare before/after against the target curve, understand diagnostics, apply the correction to your device, and export or share it.
- [Backup & restore](https://tantrumaudio.co.uk/usermanuals/omnissiah/backup-restore): Save all your device settings and calibration to a single backup file, and restore them later: before a factory reset, on a new computer, or as a known-good copy.
- [Settings](https://tantrumaudio.co.uk/usermanuals/omnissiah/settings): Choose your audio devices, tune the audio engine, route system audio through correction, manage devices, view logs, and reset the Omnissiah app to factory defaults.
- [Tuning room correction](https://tantrumaudio.co.uk/usermanuals/omnissiah/tuning-room-correction): Optional deep-dive into Omnissiah's calibration settings: measurement positions, alignment methods, optimiser accuracy, boost/cut trust and display options.
- [Custom target curves](https://tantrumaudio.co.uk/usermanuals/omnissiah/custom-target-curves): Choose the tonal balance Omnissiah's room correction aims for: the built-in target curve presets, and how to build your own curve from control points.
- [Diagnostics](https://tantrumaudio.co.uk/usermanuals/omnissiah/diagnostics): Read Omnissiah's diagnostic cards (reflections, nulls, resonances and measurement-quality warnings) and use the Latency Drift Check to find clock-drift problems.
- [Troubleshooting & FAQ](https://tantrumaudio.co.uk/usermanuals/omnissiah/troubleshooting): Fixes for common Omnissiah problems: devices not found, firmware updates, no sound, weak measurements, boosty corrections, backup/restore quirks and FAQs.
- [Glossary](https://tantrumaudio.co.uk/usermanuals/omnissiah/glossary): Plain-language definitions of the audio terms used in Omnissiah: alignment, coherence, crossover, parametric EQ, Q, room modes, nulls, target curves and more.
- [Appendix A — Reference tables](https://tantrumaudio.co.uk/usermanuals/omnissiah/reference-tables): Quick-reference limits and options for Omnissiah on the Really Mean Sub: DSP block ranges, delay units, parametric EQ, target curve, audio engine, measurement and calibration settings.
- [Appendix B — File formats](https://tantrumaudio.co.uk/usermanuals/omnissiah/file-formats): What Omnissiah's files hold: backup JSON, snapshot CSVs, output .params settings files, and the results exports (Omnissiah file, REW filters, corrected response CSVs).
- [Appendix C — Mouse & keyboard interactions](https://tantrumaudio.co.uk/usermanuals/omnissiah/mouse-and-keyboard): Quick reference to Omnissiah's non-obvious gestures: dragging EQ nodes, gain and delay steppers, unit cycling, measurement offsets, snapshot and chart interactions.
- [Appendix D — Getting help & sending feedback](https://tantrumaudio.co.uk/usermanuals/omnissiah/support): How to contact Tantrum Audio about Omnissiah, send feedback with your results file straight from the app, and what to include when reporting a problem.

### GROT User Manual (plugin version 0.1.1)

The complete manual, one page: [scroll-through version](https://tantrumaudio.co.uk/usermanuals/grot). Full text as Markdown: [llms.txt dump](https://tantrumaudio.co.uk/usermanuals/grot/llms.txt). PDF: [/grot/GROT-User-Manual.pdf](https://tantrumaudio.co.uk/grot/GROT-User-Manual.pdf). Per-chapter pages:

- [About this manual](https://tantrumaudio.co.uk/usermanuals/grot/preface): What this GROT manual covers, who it's written for, how it's organised, the conventions it uses, and the safety note that matters before you insert a distortion.
- [What GROT is](https://tantrumaudio.co.uk/usermanuals/grot/introduction): GROT plays your audio through a broken speaker: cone breakup, driver slap, torn-cone buzz, voice-coil bottoming, grime and crackle. What it does, and what it isn't.
- [Installation](https://tantrumaudio.co.uk/usermanuals/grot/installation): Install GROT on macOS: what you need, where AU, VST3 and AAX go, how to make Logic, Ableton and Pro Tools find it, and how to update or uninstall.
- [Quick start](https://tantrumaudio.co.uk/usermanuals/grot/quick-start): Five minutes with GROT and a drum loop: what happens the moment you insert it, then DAMAGE, the GROT knob, FILTH, and how DRY and WET set the blend.
- [The panel](https://tantrumaudio.co.uk/usermanuals/grot/panel-tour): A tour of GROT's channel strip: what each control is, what the VU meter's damage reading means, how to type values, resize the window and automate cleanly.
- [MODE — choosing the speaker](https://tantrumaudio.co.uk/usermanuals/grot/mode): GROT's three speaker voicings: DIRECT for no cabinet, GROTBOX for a small mid-forward box, BOOMBOX for a big ported one, and how each changes every other control.
- [DAMAGE — breaking the cone](https://tantrumaudio.co.uk/usermanuals/grot/damage): What GROT's DAMAGE knob does at every position: instability and tearing from zero, the driver slap past 40, terminal failure past 60, and what changes it for you.
- [GROT — driving it too hard](https://tantrumaudio.co.uk/usermanuals/grot/grot): The GROT knob is low-mid strain: compression, saturation and a bark resonance, plus a chainsaw layer above 50, and why it gets denser without getting darker.
- [FILTH — neglect](https://tantrumaudio.co.uk/usermanuals/grot/filth): FILTH is GROT's neglect control: a presence-keyed grime noise floor, random crackle from corroded contacts, and gentle bit corruption. What it adds and when.
- [DRY and WET — blending and level](https://tantrumaudio.co.uk/usermanuals/grot/dry-wet): GROT has two independent output faders instead of a mix knob. How to set them for insert or parallel use, why the sum is phase-clean, and how the level match works.
- [The hidden panel](https://tantrumaudio.co.uk/usermanuals/grot/hidden-panel): Click GROT's VU meter to reveal input GAIN, TILT and the sidechain. What each does, how the sidechain rides your own knob settings, and why OFF is a real position.
- [GROT in the mix](https://tantrumaudio.co.uk/usermanuals/grot/in-the-mix): Worked starting points for GROT on drum bus, mix bus, bass, lo-fi sources, vocals and sidechained destruction, with the settings written out control by control.
- [Troubleshooting](https://tantrumaudio.co.uk/usermanuals/grot/troubleshooting): Fixes for the common GROT questions: the plug-in not appearing, the band-limiting on insert, the slap not firing, noise in the gaps, clipping, and the sidechain.
- [Glossary](https://tantrumaudio.co.uk/usermanuals/grot/glossary): Every term GROT's manual uses, defined: bark, chainsaw, cone breakup, damage done, driver slap, excursion, grime, program-locked, terminal failure and more.
- [Parameter reference](https://tantrumaudio.co.uk/usermanuals/grot/parameters): Every automatable GROT parameter with its host name, range and default, plus the smoothing times and the cross-parameter behaviour between MODE, DAMAGE and GROT.
- [Specifications](https://tantrumaudio.co.uk/usermanuals/grot/specifications): GROT's full specifications: formats, platform, zero latency, bus layout, the signal chain in order, every processing stage's numbers, and the three cabinet voicings.
- [Support](https://tantrumaudio.co.uk/usermanuals/grot/support): How to get help with GROT: what to check first, what to include in a report, how to get your download link back, and two behaviours that are working as intended.

## Learn (studio monitoring & acoustics library)

- [What Is a Point-Source Studio Monitor?](https://tantrumaudio.co.uk/learn/what-is-a-point-source-studio-monitor): A point-source studio monitor radiates its full frequency range from a single point in space. Learn how point-source designs work, how they compare to two-way and coaxial monitors, and why they matter for phase coherence, stereo imaging and mix translation.
- [How to Improve Mix Translation](https://tantrumaudio.co.uk/learn/how-to-improve-mix-translation): Mixes that fall apart on other systems usually fail for a handful of identifiable reasons. Learn why mixes don't translate, from room modes and hyped monitors to loudness and listening habits, and the practical steps that fix it.
- [Why Small Rooms Cause Bass Problems](https://tantrumaudio.co.uk/learn/why-small-rooms-cause-bass-problems): Small studios struggle with bass because low-frequency wavelengths are comparable to the room's dimensions. Learn how room modes, standing waves and boundary cancellation (SBIR) create uneven, position-dependent bass, and why smaller rooms make it worse.
- [Acoustic Treatment vs Room Correction](https://tantrumaudio.co.uk/learn/acoustic-treatment-vs-room-correction): Acoustic treatment and DSP room correction solve overlapping but different problems. Learn what each can and can't fix, and a practical decision framework for which to prioritise given your room, budget and whether you rent or own.
- [Best Studio Monitors for Small Rooms: What to Look For](https://tantrumaudio.co.uk/learn/best-studio-monitors-for-small-rooms): Choosing studio monitors for a small room is about matching the speaker to the space, not buying the biggest pair. Learn the criteria that actually matter, including size, sealed vs ported, point-source coherence, SPL and DSP, so you can judge any monitor.
- [Point-Source vs Traditional Studio Monitors](https://tantrumaudio.co.uk/learn/point-source-vs-traditional-monitors): A clear, beginner-friendly comparison of point-source and traditional two-way studio monitors: how each design works, their strengths and trade-offs, and which suits different rooms, genres and budgets.
- [Understanding Phase Coherence](https://tantrumaudio.co.uk/learn/understanding-phase-coherence): A technical guide to phase coherence: phase response, group delay, where monitors lose coherence (crossovers, driver offset, ports), minimum-phase vs linear-phase behaviour, how it's measured, and what's actually audible.
- [Understanding Stereo Imaging](https://tantrumaudio.co.uk/learn/understanding-stereo-imaging): Stereo imaging is the perceived position and size of sounds across the space between two monitors. Learn how the brain localises sound, how phantom images form, what degrades imaging, and how to set up monitors for an accurate stereo image.
- [Studio Monitor FAQ](https://tantrumaudio.co.uk/learn/studio-monitor-faq): Clear, practical answers to common studio monitor questions: active vs passive, nearfield vs midfield, what size and how loud, sealed vs ported, sub integration, placement, calibration and when to upgrade.
- [Point-Source Monitor FAQ](https://tantrumaudio.co.uk/learn/point-source-monitor-faq): Common questions about point-source studio monitors answered: what they are, single-driver vs coaxial, imaging and coherence, bass and SPL limits, small-room and immersive use, and how they compare to two-way monitors.
- [What Is a Studio Monitor?](https://tantrumaudio.co.uk/learn/what-is-a-studio-monitor): A studio monitor is a loudspeaker built for accurate, uncoloured reproduction so engineers can hear a recording as it really is. Learn what defines a monitor, why accuracy matters, and how monitors differ from consumer speakers.
- [Studio Monitors vs Hi-Fi Speakers](https://tantrumaudio.co.uk/learn/studio-monitors-vs-hi-fi-speakers): Studio monitors and hi-fi speakers are built for opposite goals: accuracy versus enjoyment. Learn how their voicing, distortion, directivity and intended use differ, and which to choose for mixing or for listening.
- [Active vs Passive Studio Monitors](https://tantrumaudio.co.uk/learn/active-vs-passive-studio-monitors): Active monitors have amplification built in and matched to the drivers, while passive monitors need a separate power amp. Learn how the two approaches differ in matching, crossovers, DSP, setup and cost, and which suits most studios.
- [Nearfield vs Midfield Monitors](https://tantrumaudio.co.uk/learn/nearfield-vs-midfield-monitors): Nearfield monitors are designed for close listening so the room matters less, while midfield monitors suit larger, treated rooms at greater distances. Learn the difference, the trade-offs, and which fits your space.
- [What Makes a Studio Monitor Accurate?](https://tantrumaudio.co.uk/learn/what-makes-a-studio-monitor-accurate): Accuracy in a studio monitor comes from several measurable qualities: a flat frequency response, low distortion, good time and phase behaviour, and consistent directivity. Learn what each means and why the room is part of the equation.
- [Why Frequency Response Matters](https://tantrumaudio.co.uk/learn/why-frequency-response-matters): Frequency response describes how evenly a monitor reproduces the audible range. Learn what a flat response means, how colouration misleads mix decisions, how to read a response graph, and why on- and off-axis both matter.
- [Coaxial vs Traditional Monitor Designs](https://tantrumaudio.co.uk/learn/coaxial-vs-traditional-monitor-designs): Coaxial monitors mount the tweeter at the acoustic centre of the woofer, while traditional two-ways space the drivers apart. Learn what the coaxial arrangement achieves, its engineering challenges, and how the two approaches compare.
- [Understanding Room Modes](https://tantrumaudio.co.uk/learn/understanding-room-modes): Room modes are standing-wave resonances that make bass uneven and position-dependent. Learn how axial, tangential and oblique modes form, how to estimate your room's modes, and what reduces their effect.
- [Speaker Placement in Small Studios](https://tantrumaudio.co.uk/learn/speaker-placement-in-small-studios): Where you put your monitors and your seat shapes the low end, the imaging and the reflections you hear. Learn the symmetry, triangle, distance and height rules that get the most from a small room, before spending on anything else.
- [Should You Use a Subwoofer in a Small Studio?](https://tantrumaudio.co.uk/learn/should-you-use-a-subwoofer-in-a-small-studio): A subwoofer can extend the low end and free placement, but in a small room it only helps when properly integrated. Learn the case for and against, when a sub makes sense, and what good integration requires.
- [Sealed vs Ported Studio Monitors](https://tantrumaudio.co.uk/learn/sealed-vs-ported-studio-monitors): Sealed monitors use a closed cabinet, ported monitors add a tuned vent for more low-end output. Learn how each enclosure behaves in frequency, phase and transient response, and which suits small rooms and mixing.
- [How to Integrate a Studio Subwoofer](https://tantrumaudio.co.uk/learn/how-to-integrate-a-studio-subwoofer): Integrating a subwoofer means setting four things correctly: placement, crossover, level and phase or time alignment. Learn a practical, measure-as-you-go procedure for a smooth, even handover with your main monitors.
- [What Crossover Frequency Should I Use?](https://tantrumaudio.co.uk/learn/what-crossover-frequency-should-i-use): The crossover frequency is where your main monitors hand low content to the subwoofer. Learn how to choose it from your mains' roll-off and size, why around 80 Hz is common, and how slopes and the room affect the setting.
- [Why Mixes Sound Different on Different Systems](https://tantrumaudio.co.uk/learn/why-mixes-sound-different-on-different-systems): A mix changes from system to system because each speaker, room and listening level reproduces it differently. Learn the specific causes, from frequency response and bandwidth to mono summing and loudness, and what you can control.
- [Desk Reflections Explained](https://tantrumaudio.co.uk/learn/desk-reflections-explained): A desk reflects sound from your monitors up to your ears slightly after the direct sound, causing comb filtering that colours the response and blurs imaging. Learn how the reflection forms and how to reduce it.
- [FIR vs IIR Filters](https://tantrumaudio.co.uk/learn/fir-vs-iir-filters): FIR and IIR are the two families of digital filter used in audio DSP. Learn how they differ in phase behaviour, latency, CPU cost and stability, and when each suits monitor and room correction.
- [Glossary of Studio Monitoring Terms](https://tantrumaudio.co.uk/learn/glossary-of-studio-monitoring-terms): Plain definitions of the terms used in studio monitoring, grouped by topic: monitor types, loudspeaker design, room acoustics, imaging and translation, phase and time, and measurement and DSP.
- [Understanding Speaker Directivity](https://tantrumaudio.co.uk/learn/understanding-speaker-directivity): Directivity describes how a speaker's output changes with angle. Learn what off-axis response and dispersion mean, why directivity shapes the sound a room reflects back to you, and why consistent directivity matters more than wide.
- [Impulse Response Explained](https://tantrumaudio.co.uk/learn/impulse-response-explained): The impulse response is a system's output to a single short spike, and it fully describes how a monitor or room behaves. Learn what it contains, what it reveals about reflections and timing, and how it is measured and used.
- [What Is Time Alignment?](https://tantrumaudio.co.uk/learn/what-is-time-alignment): Time alignment means all of a monitor's output reaches your ears at the same instant. Learn why separated drivers arrive at different times, how designers align them, and why a single driver is aligned by construction.
- [What Causes Distortion in Monitors?](https://tantrumaudio.co.uk/learn/what-causes-distortion-in-monitors): Distortion is any change that makes a monitor's output an unfaithful copy of the input. Learn the main sources, from driver excursion limits and amplifier clipping to port noise and cabinet resonance, and how to keep it low in use.
- [Best Compact Studio Monitors: What to Look For](https://tantrumaudio.co.uk/learn/best-compact-studio-monitors): Compact monitors suit small rooms, desks and nearfield listening, and a small monitor can be genuinely accurate. Learn the criteria that matter, the trade-offs to accept, and when compact is the right choice.
- [Best Studio Monitors Under £1000: How to Spend It](https://tantrumaudio.co.uk/learn/best-studio-monitors-under-1000): A £1000 monitoring budget goes further when you spend it on the whole system, not just the speakers. Learn how to allocate it across monitors, stands, treatment and a possible subwoofer, and what to prioritise in the monitor itself.
- [Why Some Monitors Translate Better Than Others](https://tantrumaudio.co.uk/learn/why-some-monitors-translate-better-than-others): Some monitors lead to mixes that hold up elsewhere, and others flatter you into decisions that fall apart. Learn the monitor qualities that drive translation: an honest response, coherence and imaging, and consistent directivity.
- [Real-Time Room Measurement Explained](https://tantrumaudio.co.uk/learn/real-time-room-measurement-explained): Real-time room measurement shows your monitoring response as you adjust, rather than from a single captured sweep. Learn how it works, what it shows well, its limits versus a gated measurement, and how to use it.

## Support

- [Support](https://tantrumaudio.co.uk/support): contact the team
- [Downloads](https://tantrumaudio.co.uk/downloads): software, user guides, brand assets
- [FAQ](https://tantrumaudio.co.uk/faq)
- [Warranty](https://tantrumaudio.co.uk/warranty)