# Acoustics Basics

> Comprehensive acoustics reference with tables, equations, and noise level data. (iPhone/iPad app by Emad Attia.)

- Source: https://appshunter.io/ios/app/acoustics-basics/id388652254 (this page in markdown: same URL + `.md`)
- Developer: [Emad Attia](https://appshunter.io/developer/366401754)
- Category: Reference, Education
- Price: $4.99
- Age rating: 4+
- Requires: iOS 12.0 · 16 MB
- Languages: English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Chinese and 1 more
- Released: 2010-08-27
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/acoustics-basics/id388652254/reviews.md

## What is Acoustics Basics?

Acoustics Basics is ideal for sound engineers, media professionals and audiophiles. The app includes a variety of tables, equations, tips and notes. 

Also, includes a list of acceptable noise/sound levels for indoors and outdoors for a variety of building structures and environments.

Table of Contents: 

- Abatement and Distance from Source
- Acceptable Noise - dBA - Levels
- Adding Decibels
- Blade Dampers and Noise Generation
- Blade Pass Frequency - BPF
- Classification of Noise Reduction Silencers
- Comparing Noise Criteria
- Daily Noise Dose Level
- Decibel
- Decibel A, B and C
- Directivity Coefficient and Sound Attenuation 
- Ducts - Noise Generation
- EPA Protective Noise Levels
- Fans and Noise Power Generation
- Floor Vibration
- Frequency Limits for Octave Bands
- Ldn - Day and Night Sound Level
- Leq - Equivalent Sound Level
- Ls - Sound Exposure Level
- Machines - Sound Level Reduction
- Maximum A-Weighted Sound Levels Allowed
- NC - Noise Criterion
- Noise Exposure - Permissible Level and Duration
- Outdoor Ambient Sound Levels
- PNC - Preferred Noise Criterion
- Propagation of Sound Indoors
- Propagation of Sound Outdoors
- RC - Room Criteria
- REL - Noise Recommended Exposure Limit
- Reverberation Time
- Room Absorption Characteristics
- Sound Absorption Coefficients
- Sound Attenuation
- Sound Attenuation due to End Reflection
- Sound Attenuation in Duct Elbows
- Sound Attenuation in Unlined Sheet-Metal Ducts
- Sound Frequency, Wavelength and Octave
- Sound Intensity
- Sound Power
- Sound Power, Intensity and Pressure
- Sound Pressure
- Sound Pressure - Recommended Maximum Levels in Rooms 
- Sound Transmission Through Massive Walls or Floors
- Sound Transmission through Duct Walls
- Speed of Sound
- Speed of Sound in some materials
- Speed of Sound in Gases
- Speed of Sound in some common Liquids
- Speed of Sound in some common Solids
- Subjective Effect of Change in Sound Pressure Level
- Telephones in Noisy Areas
- Voice Level and Distance


* All Content is Searchable
* All Content is available offline (no need for WiFi or Internet Connection) 
* Please send us any questions, comments or suggestions using our website

## Key features

- Extensive tables and equations
- Acceptable noise level data
- Tips and notes for professionals
- Searchable content
- Offline availability
- Covers a wide range of acoustic topics

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/acoustics-basics/id388652254/reviews.md

### 3/5 — Good, but...

*2011-03-26, version 1.0*

Lacks of a better user interface. Also when I scroll down to the bottom of a page, the last ending phrase does not always show up. Please, fix this. 

Thank you

**Developer response:** These issues have been resolved in recent updates. Thanks for your feedback.

### 3/5 — Good text reference

*2010-09-01, version 0*

Good pocket reference for those who already have a sense for acoustics, but probably not for beginners. No calculators, text only. Surprised it's almost 7 MB for a text only app.  I love supporting developers bringing acoustics apps to mobile devices though and hope the he/she continues building upon it!

## Frequently asked questions about Acoustics Basics

### What is Acoustics Basics?

Acoustics Basics is a reference application designed for sound engineers, media professionals, and audiophiles. It offers a wide array of tables, equations, tips, and notes related to acoustics, including data on acceptable noise levels for various indoor and outdoor environments.

### Is Acoustics Basics available offline?

Yes, all content within Acoustics Basics is available offline. You do not need a WiFi or internet connection to access the tables, equations, and other information provided by the app.

### Can I search for specific topics in Acoustics Basics?

Yes, all content within Acoustics Basics is searchable. This feature allows users to quickly find specific information on acoustic concepts, equations, or noise level data they are looking for.

### What kind of acoustic topics does Acoustics Basics cover?

Acoustics Basics covers a broad spectrum of acoustic topics, including noise abatement, decibel levels, sound attenuation, noise criteria (NC, PNC, RC), reverberation time, sound absorption, and speed of sound in various materials.

### What are the acceptable noise levels covered in Acoustics Basics?

The app includes a list of acceptable noise/sound levels (dBA) for indoors and outdoors across a variety of building structures and environments, such as EPA Protective Noise Levels and Maximum A-Weighted Sound Levels Allowed.

### What devices is Acoustics Basics compatible with?

Acoustics Basics is compatible with iPhone, iPad, and iPod devices. It is designed for users who need quick access to acoustic reference material on their Apple mobile devices.

### How frequently is Acoustics Basics updated?

The app was last updated on April 4, 2020, with version 3.9. While updates may vary in frequency, this indicates recent maintenance and potential improvements to the content or functionality.

### What is the price of Acoustics Basics?

Acoustics Basics is a paid application priced at $4.99. This one-time purchase grants access to all the reference material and features within the app.

## Version history (last 1 release)

### 3.9 — 2020-04-04

- Fixed build issue

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All apps by Emad Attia: https://appshunter.io/developer/366401754

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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 2026-06-10.*