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.

iTestMic2 / USB-C Available Soon!

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.

AudioTools on Mac M1

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.

Product Updates

We introduced 4 new or updated hardware products at InfoComm  2019. Here they are:


The revolutionary installed smart sound monitor, wireless AudioTools interface, and Vibration Analyzer. Learn more about this amazing new development.




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The Universal Measurement microphone that connects to every platform, and works with every app. Fully compatible with iPad Pro USB C.

uTestMic is the only USB measurement mic that includes and audio output jack.

Every uTestMic is factory-calibrated and includes a frequency  compenstation file. Now shipping!


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The USB C connected precision Class One capable microphone. Direct connect to iPad Pro USB, many Android smartphones and Mac and Windows computers.

Also compatible with expected future USB C iPhones.

uPrecisionMic is in pre-order and will ship very soon!


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Now updated with an audio output and an improved charging system using our standard 5V 1.8mm connector.

Send test signals directly from the microphone.

Shipping soon!

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.

iOS 15 Status?

As always, we DO NOT recommend updating to iOS 15 while it is in beta. Things are do buggy, and change so much during iOS betas that we don’t try to keep up with them. We will have full compatibilty once iOS 15 is released to the public in its final form.

Also see our iAudioInterface2 FAQ for information about a problem with the Surround Generator on iOS 13 with iAudioInterface2.

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. 

Sound Level Control

Now you can use AudioTools with a 2-channel audio interface to automatically control the sound level in a club or music venue. Coming in the next release of AudioTools.

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

iOS 12 Fully Supported

iOS 12 is recommended for all users. All Studio Six Digital apps are now fully iOS 12 compatible. If your app is crashing, please update to the latest version on the App Store.

iPhone XR, XS and XS Max

All of our apps will work fine on the new devices. We have just released an AudioTools update that supports iPhone XS and XS Max, please update to 10.19.

Upgrade to AudioTools 10.20 today.

iPad Pro and other iOS devices with USB C

Apple has begun releasing products with a USB C connector rather than Lightning. It does not seem like there is (or will be) an adapter that will allow the use of Lightning products with this iPad or future iOS devices which may have a USB C connector.

Because of this, and the presumed move towards USB C on all of their iOS products, we have developed new products that support these devices, and in fact all iOS devices with the proper adapter, as well as Android devices and Mac and Windows computers. 

See our uTestMic and uPrecisionMic product pages.

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. 

Hold everything with the Weatherproof Multi-Purpose Case


Our new heavy-duty, waterproof Multi-Purpose Cases are in, and ready to ship. They have high-density foam that is laser-cut to fit our microphones, and iPhones (models 5, 6, and 7, but not Plus) as well as an iPad mini.

Great way to transport and present the AudioTools system, or use it for other equipment.

Now shipping.

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.


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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 iTestMic, to complete your mobile professional audio test & measurement system.

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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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