# Sub System — Simulation for audio engineers

> Acoustic simulation app for visualizing sound pressure levels and interactions. (iPhone/iPad app by sebastian rivas.)

- Source: https://appshunter.io/ios/app/sub-system/id1533524994 (this page in markdown: same URL + `.md`)
- Developer: [sebastian rivas](https://appshunter.io/developer/506708461)
- Category: Education, Utilities
- Price: $9.99 (on sale, was $19.99)
- Age rating: 4+
- Requires: iOS 13.0 · 48 MB
- Released: 2020-09-29
- Data updated: 2026-08-29
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sub-system/id1533524994/reviews.md

## What is Sub System?

An app for audio engineers and sound designers. It will let the user place virtual speakers around and see the sound pressure levels that they produce, including the interactions between sources. Colorful graphs for SPL. Frequency response based on virtual microphones. Speakers and Mics are moved around using touch functions. Zoom in, out. All graphics are touchable. Best use is to understand how acoustical summation is produced.

## Key features

- Virtual speaker placement
- Sound pressure level visualization
- Frequency response graphs
- Virtual microphone simulation
- Touch-based manipulation
- Acoustical summation understanding

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/sub-system/id1533524994/reviews.md

### 5/5 — Handy to have in your pocket when we can get back in a field

*2021-03-24*

Sebastian has made tons of useful tools over the years, and is super receptive to feedback. I know, because I’ve bothered him with little suggestions for one of his other apps (Danley Direct) over the years! It would be awesome if you could enable table-based or typed data entry for speaker and mic positions as well as the drag-and-drop system! Right now it takes a little while to get things just right with my fat fingers 😅 also on my wish list is copy and paste of a cluster of subs... if you can also include a mirror tool across the x or y axis then I’d be in love 😍

## Frequently asked questions about Sub System

### What is Sub System used for?

Sub System is used by audio engineers and sound designers to visualize sound pressure levels and understand how different sound sources interact acoustically. It helps in comprehending acoustical summation through interactive simulations.

### How does Sub System help in learning acoustics?

The app provides a visual and interactive way to learn about acoustics by allowing users to place virtual speakers and microphones and observe the resulting sound pressure levels and frequency responses. This hands-on approach aids in understanding complex acoustic principles.

### What devices is Sub System compatible with?

Sub System is compatible with iPhone, iPad, and iPod devices. It was released on September 29, 2020, and its latest version is 1.8, last updated on January 23, 2022.

### What is the price of Sub System?

Sub System is a paid application, priced at $19.99. There are no in-app purchases or advertisements associated with this application.

### Does Sub System have ads?

No, Sub System does not contain advertisements. It is a paid application with a one-time purchase price of $19.99.

### How often is Sub System updated?

The application was last updated on January 23, 2022, with version 1.8. While specific update frequency isn't detailed, this indicates it receives maintenance and feature updates.

### What is the age rating for Sub System?

Sub System has an age rating of 4+, making it suitable for a wide range of users interested in audio simulation and acoustics.

### Can I use Sub System offline?

The provided information does not specify offline functionality. However, as a simulation and visualization tool, it is likely designed to function without a constant internet connection after initial purchase.

## Version history (last 5 releases)

### 2.0.4 — 2026-08-25

Bug fixes.

- Fixes a crash on launch that affected the previous version.
- The launch screen now shows the app's own artwork.
- The app is correctly named Sub System throughout the system.

### 2.0.3 — 2026-08-24

Save and open your projects.

- Save your setup to a .subsystem file: subs with their position, rotation, gain, delay, polarity and box model, your microphones, the frequency and the view.
- Open it later from the Files app, from Mail or straight from the app.
- Tapping a .subsystem file anywhere on your device opens it in Sub System.
- Send a project to a colleague and they open exactly what you built.

### 2.0.2 — 2026-08-22

Bug fixes.

- The 3D view is now fully in English: graph titles, the sub editor and the settings panel had a few labels left in Spanish.
- Small polish across the interface.

### 2.0.1 — 2026-08-21

New Apps section.

- A new "New Apps" entry in the main menu opens our catalogue: every app we make for iPhone, iPad and Mac, on one page.
- The same shortcut is at the bottom of the 3D view, under the graphs.
- It opens in your browser, so you never lose your work in the app.

The 3D view introduced in 2.0 is still free for everyone who owns Sub System.

### 2.0 — 2026-08-17

Sub System is now 3D — and it is free for everyone who already owns the app.

THE NEW 3D VIEW
- See the sound field in three dimensions, computed with the same physics as the 2D view: phasor summation of every sub, with its gain, delay, polarity and model.
- Three ways to look at it: horizontal plane, vertical section and balloon.
- Live horizontal polar plot and frequency response at the microphones.
- Touch a sub to edit it: move it, change its height, gain, delay and polarity, add subs or remove them.
- One tap carries your current 2D setup into 3D, and one tap brings you back.

ALSO FIXED IN THIS VERSION
- The app now uses the whole screen on iPhone; the black bars are gone.
- The 2D plot is always square, with exactly the same scale across and up, so distances read true.
- The top toolbar fits in a single row on phones.
- Zooming with the mouse wheel is smooth and stays anchored where the pointer is.

This is a big change, and more are on the way.

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## More apps by sebastian rivas

- [Can U Hear](https://appshunter.io/ios/app/can-u-hear/id1518911937)
- [Omni Sub](https://appshunter.io/ios/app/omni-sub/id1524175030)
- [Reflex Sub](https://appshunter.io/ios/app/reflex-sub/id1531208648)
- [Ear Power](https://appshunter.io/ios/app/ear-power/id1536647714)
- [Danley Tools](https://appshunter.io/ios/app/danley-tools/id1538456260)

All apps by sebastian rivas: https://appshunter.io/developer/506708461

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*