# AV Toolbox — Calculators and Tone Generator

> Calculators and Tone Generator (iPhone/iPad app by Sound Directory.)

- Source: https://appshunter.io/ios/app/av-toolbox/id1364167623 (this page in markdown: same URL + `.md`)
- Developer: [Sound Directory](https://appshunter.io/developer/546124639)
- Category: Utilities, Productivity
- Price: Free (on sale, was $0.99)
- Age rating: 4+
- Requires: iOS 11.2 · 19 MB
- Languages: American English
- Released: 2018-03-28
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/av-toolbox/id1364167623/reviews.md

## What is AV Toolbox?

AV Toolbox contains a range of tools handy for the AV professional and amateur alike.

Audio calculators are included for:
Sound Pressure Level (SPL) at applied power levels and distance from speaker 
Calculation of impedance based on 70V and 100V line applied power and vice-versa.
Ohms Law - Voltage, current & Resistance.
Delay based on distance from speaker.

Video calculators are included for:
Projector throw distances based on screen width and projector min and max throw ratios.
Screen sizes based on throw distance and projector min and max throw ratios.
Calculation of throw ratios based on throw distance and screen width.

Tone generators - Pink, White, Sine and Voice.

Audio data sheets for:
Common UK radio mic frequencies.
Typical SPL chart.
Common audio signal levels.
Links to ICSE & PLASA organisations.

Video data sheets for:
VGA Pin configuration.
SCART Pin Configuration.
Common screen resolutions.

This app does not claim to be the definitive guide to all things audio-visual but but contains information used on a day-by-day basis by AV engineers to carry out their work efficiently and quickly.


## Version history (last 2 releases)

### 1.2 — 2018-03-28

Minor bug fixes relating to tone generators

### 1.0 — 2018-03-27

No release notes.

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## More apps by Sound Directory

- [Commercial Audio](https://appshunter.io/ios/app/commercial-audio/id6739622561)
- [Transpose](https://appshunter.io/ios/app/transpose/id6739883393)

All apps by Sound Directory: https://appshunter.io/developer/546124639

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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 2026-05-19.*