Studio Six Digital

Studio Six Digital creates advanced audio test and measurement systems based on the iOS platform. Some of the applications include live sound monitoring, sound system setup and EQ, community noise, house of worship, and education.

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AudioTools is the professional audio test & measurement app that gives you a comprehensive set of tools on your iOS mobile device. Perfect for A/V techs, FOH, recording engineers, acousticians, home theater installers, and anyone who loves pro audio. 

Upgrade AudioTools with iAudioInterface2, or iTestMic2, to complete your mobile professional audio test & measurement system.

iTestMic2 / USB-C Available Now!

We now have a USB-C version of our popular iTestMic2, see this page for more information.

HAA Home Theater Calibration Tools in AudioTools

We are very excited to announce the release of the HAA Home Theater Calibration tools, available for HAA Pro Installers and home users. This app was built in collaboration with the Home Acoustics Alliance (HAA), and is a full implementation of the tools used in the HAA Home Theater Certification Course, taught by Gerry Lemay.

See this page on the HAA site for more information.

Note that this course and tools are not included in the “All-In” option, as this is a third-party application. If you purchased an All-In license you can get the HAA Pro Tools at a discount, which will be applied automatically.

AudioTools on Mac M1/M2

We can confirm the exciting news that AudioTools (and our other apps) are now available for download from the Mac App Store on the new awesome M1 Macs! This includes the new MacBook Pro, Macbook Air, MacBook Pro 13, new iMacs, and the new Mac Mini. I have a MacBook Pro with the M1 chip, and it is truly amazing. Much faster than my 2-year old MacBook Pro development machine. 

Everything runs great, other than a few minor display bugs that we will fix soon. The basic interface is very similar to the iPad, except that you can stretch and shrink the app window, or even run it full screen!

Any audio device that works with Mac can be used as input, you just select the input source from the Mac System Preferences panel.

NOTE: For iAudioInterface2 users, please see the information on our new USB-C cable, and how to use iAudioInterface2 on a Mac.

And best of all, you don’t have to pay extra to run AudioTools there, your app purchase and in-app purchases all transfer for free! We’re very excited to be able to offer a solution for laptop and desktop machines, and as Apple rolls out more models with the M1 chip we will continue to support them.

To download AudioTools, open the App Store and type “AudioTools” in the search field, and make sure you are looking in “iPhone and iPad Apps”.

New! LARSA Now Supports External Test Signals, works with Atmos

We’ve added the ability for LARSA to use an external chirp signal, so you don’t have to connect your iOS device to your sound system. Check out the LARSA page for more information. And, since Surround Generator now has the LARSA test signal, you can run LARSA on your Atmos home theater system.

Dolby Atmos 9.1.6 Signals available in Surround Generator (Apple TV)

It’s been our goal to add Atmos system testing to the AudioTools platform, and we are now happy to announce that we have added full support for Atmos 9.1.6 audio surround test signals in our Apple TV Surround Generator app

Route pink noise, polarity test, Impulse, and Sweeps to any channel, either on the main 9 channels, the 6 ceiling channels, or the subs. Use these signals with AudioTools to set up your system, or to test that the system was installed properly. You can also find out exactly what your processor is doing with signals that do not have speakers. Apple TV 4K is required for Atmos signals.

For a limited time, the Atmos signals in-app purchase is on sale! To install the Surround Generator, go to the App Store on your Apple tv 4k, and search for “Surround Generator”. Get the app and add the Atmos signals now while this sale is running.

Remote System Testing

Check out these ideas for testing a system remotely, when you cannot physicaly be present.

New Demo Videos

Todd Urban with Urban Sound has done a nice review of iTestMic2 and AudioTools, and a demo of LARSA in the studio.

What’s New:

iPad Pro (USB C models) Now Approved for USB Audio

The USB audio support on the USB C iPads had serious problems, but the worst of them seem to fixed now. The labelling of USB audio devices as “headset mic” has been fixed, as has the incorrect USB gain issue. These models are now full compatible with our USB microphones, uTestMic and uPrecisionMic. Please make sure you update your iPad to the latest iOS 13 release.

However, some problems are still remaining:

  • No support for legacy MFi products, even with adapters. iTestMic2 and iPrecisionMic will not work at all, even with an adapter. No plans to add this, according to Apple.
  • No support for USB HID controls. This means we cannot provide an iAudioInterface2 control panel. Apple also has not plans on adding this support.

Surround Signal Generator for Apple TV

Download this app to your Apple TV, and use it to generate test signals for use with AudioTools. Now available. 

New! Upgrade Calculator

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Buy AudioTools on the iOS App Store

Due to requests from our many long-term customers, we have added a new path to the Unlock Everything upgrade.

The Upgrade Calculator will inspect the app for already installed in-app purchases, and pro-rate the full upgrade cost by the approximate percentage of apps that you already have bought. You will then be presented with the oppurtunity to purchase this upgrade, which has the same benefits as the Unlock Everything option.

Note that depending on your previous purchase history, you may be presented with a one-time discount that is valid for 24 hours. Note that if you do not use it within that time period, the discount will expire and not appear again.

To find the Upgrade Calculator, just navigate to the Support & Upgrades menu, and you will see the Upgrade Calculator.

See our new updated privacy policy

7-Day Trial Period for In-App Purchases

Not sure if you want to spend the money for one of the in-app purchase upgrades? Now you can try it for 7 days for free, and if it meets your needs purchase it at that time. Trial periods apply to all in-app purchases, with the exception of the "Unlock All Modules" upgrade. Worry-free, these do not automatically convert to purchases.

Try them out today!

Microphone Calibration Database

We have implemented a cloud-based database with individual calibration values for every iOS model, in all supported iOS versions. Now we can update calibration for new devices in real time, without requiring an app update. You may see messages about new calibrations being installed from time to time. Please let us know if you are experiencing any calibration issues, by using our Calibration Error Report.

AudioTools User Guide

Download our new AudioTools User Guide here for a comprehensive overview of AudioTools.

Unlock Everything with the  "All-in Option"

Get every module and save money! Perfect for the professional user who needs multiple AudioTools modules. Unlock the full power of AudioTools.

The newest audio input device: iTestMic2 

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iTestMic2 improves on the popular iTestMic by adding a 3.5mm stereo analog output jack and iOS device charging. The perfect solution for iPhone 7. Now with individual frequency calibration files.

iTestMic is the most affordable way to have a calibrated SPL Meter, RTA, FFT analyzer and more.  Plug it into your iPhone, iPod touch, or iPad to get a mobile professional test & measurement system. $229.

Includes an analog output and iOS device charging. Use it for home theater setup, live sound, SPL testing, or sound contracting work. 

Order iTestMic2 here. 

iAudioInterface2 Lightning/USB now shipping.



iAudioInterface2 and included iOS Lightning and USB Audio interconnect cables.

The professional audio interface for iOS devices made to work with for AudioTools.

Phantom powered mic input, balanced line input and output, digital audio output, internal battery, and iOS device charging.



iPrecisionMic is the perfect addition to your AudioTools setup to get the most accurate and lowest-noise measurements. Plug it into your iOS device running AudioTools and instantly you can have a Type 1 certified sound level meter and analyzer.

Perfect for noise monitoring and surveys, critical acoustical analysis work, and any time that a high-quality precision professional microphone is required. Available both with and without a Type 1 Calibration Certificate, starting at $1099.


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