Studio Six Digital LLC S6D Manuale utente

iAudioInterface2

User Guide

Studio Six Digital LLC

V 1.3 November 1, 2011

iAudioInterface2 User Guide Page 2

Studio Six Digital LLC reserves the right to make changes in specifications and other information contained in this

publication without prior notice, and the reader should in all cases consult Studio Six Digital LLC to determine

whether any such changes have been made. This manual may not be reproduced, and is intended for the exclusive

use of Studio Six Digital LLC users.

The terms and conditions governing the sale and use of the iAudioInterface2 consist solely of those set forth in the

written contracts between Studio Six Digital LLC and its customers. No statement contained in this publication,

including statements regarding capacity, suitability for use, or performance of products, shall be considered a

warranty by Studio Six Digital LLC for any purpose or give rise to any liability of Studio Six Digital LLC.

In no event will Studio Six Digital LLC be liable for any incidental, indirect, special, or consequential damages

(including lost profits) arising out of or relating to this publication or the information contained in it, even if Studio

Six Digital LLC has been advised, knew, or should have known of the possibility of such damages.

The iAudioInterface2 described in this document is copyrighted and is confidential information and a proprietary

product of Studio Six Digital LLC. The copyright laws prohibit the copying of this manual or any of the support

software programs without the written consent of Studio Six Digital LLC, except in the normal use of the product, or

to make a backup copy. This exception does not allow a copy to be made for others. Copying, under the law,

includes translating into another language or format.

Studio Six Digital LLC

Boulder, CO USA

www.StudioSixDigital.com

Printed in USA

Revised: February 2, 2012

General Notice: some of the product names used herein have been used for identification purposes only and may

be trademarks of their respective companies.

iAudioInterface2 is a trademark of Studio Six Digital LLC.

iPad, iPhone, iPod, iPod classic, iPod nano, iPod shuffle, and iPod touch are trademarks of Apple Inc., registered in

the U.S. and other countries.

“Made for iPod,” “Made for iPhone,” and “Made for iPad” mean that an electronic accessory has been designed to

connect specifically to iPod, iPhone, or iPad, respectively, and has been certified by the developer to meet Apple

performance standards. Apple is not responsible for the operation of this device or its compliance with safety and

regulatory standards. Please note that the use of this accessory with iPod, iPhone, or iPad may affect wireless

performance.

iAudioInterface2 User Guide Page 3

Quick Start

iAudioInterface2 (iAI2) is a combination audio line input, line output, digital optical output,

headphone amp, and microphone input accessory for iPhone® 4, iPod touch® 4, and iPad®. It

connects to the attached iOS device using a digital audio link for lowest noise and highest quality

audio.

Hardware Requirements

iAudioInterface2 is designed to work with iPod touch® 4, iPhone® 4, or iPad® running OS 3.0 or

later.

App Compatibility

iAudioInterface2 is compatible with AudioTools, and many iOS Apps which play, record, or process

audio. While we have tested iAI2 with many Apps and found that it works with many (including

Apple’s GarageBand), we do not guarantee compatibility with all Apple or 3rd party Apps. In

particular, the phone App on iPhone does not use dock connector audio, and will not work with

iAI2.

Installation and Setup

To install iAudioInterface2, plug it into the dock connector of any compatible iOS device. Hold the

plug parallel to the connector, since plugging in at an angle may cause the device to not recognize

iAudioInterface2. Make sure that you hear both latches click so that you know you have a firm

connection. Some third-party plastic outer cases have smaller openings for dock connector cables,

so make sure that the case does not interfere with the iAudioInterface2 connector, and that the

connector is making solid contact with the dock connector.

Note that it takes approximately 3 seconds for iAudioInterface2 to be recognized by your iOS

device. So, if you plug iAI2 in while AudioTools is running, wait for the confirmation box before

trying to use it.

Note that it is possible for the iOS device to find the accessory, but iAudioInterface2 not be fully

functional if the connector is not fully seated or was plugged in at an angle.

Battery Charging and Power

iAudioInterface2 always runs off its own battery, or the external power supply, if plugged into it. It

draws no power from your iOS device. Run time is 3-5 hours, depending on usage.

iAudioInterface2 User Guide Page 4

Your iOS device always runs off its own internal battery, unless iAI2 is connected and an external

power supply is plugged into iAI2. In that case, your iOS device will be powered from the external

power supply, and the iOS device internal battery will be charging.

See the power / charging section of this manual for more information.

App Installation

If you do not have the AudioTools App installed, when you connect iAudioInterface2 to your device

a prompt will appear, and you will be asked if you want to install AudioTools. This behavior is

normal and is a feature of iOS. Although AudioTools is not required to use iAudioInterface2, it is

recommended so that you can take advantage of all of its features.

Calibration

You can use iAudioInterface2 right out of the box, but for more accurate results see our calibration

section below for information on how to calibrate your iAudioInterface2.

Default Configuration

As shipped, iAudioInterface2 is in the following configuration, which is used in Apps other than

AudioTools:

•Mono Line Input, microphone input enabled, phantom power off, 0 dB gain

•Line input gain range -70dBu to +8dBu

•Stereo (headphone) output

•Output level control enabled

These settings can be changed in the AudioTools App, see below for more information.

iAudioInterface2 User Guide Page 5

Block Diagram

iAudioInterface2 Block

Diagram

Line

Input

Line

Output

Level

Control

Mic

Input

Input Source

Select

Balanced / Mic

Input Select

Right

Output

Left

Output

Right

Input

Left Input

to iOS Device

Digital Audio

Inputs

from iOS

Device Digital

Audio Outputs

Balanced /

Stereo Output

Select

Legend

Right Output Signal

Left Output Signal

Right Input Signal

Left Output Signal

Microphone Signal

Control Signals

Mic Gain Select

Line Input Gain Select

Output Level

Control Enable

Optical

Digital

Audio

Output

Phantom Power

On / Off

iAudioInterface2 User Guide Page 6

Connections

Configurations

iAudioInterface2 may be setup in a number of ways depending on your needs. The input and output

can be mono or stereo, the output level control can be enabled or disabled, and there are several

available gain ranges for the inputs. It is also possible to internally connect the line output to the

right input, in order to monitor the output level directly (AudioTools only).

While you are running AudioTools, all of these settings are controlled to set up iAudioInterface2

appropriately for the function or test that AudioTools is currently running.

When you are using iAudioInterface2 with another App, you can still control its configuration.

To select the settings that you want to be in effect when you are using iAudioInterface2 with

another App, start AudioTools and go to the Settings->Configuration screen, and select the settings

that you want. When you exit AudioTools, these settings will be in effect, and as they are stored in

non-volatile memory in iAudioInterface2, even if you unplug it or power down your iOS device, the

Configuration settings will be available when you next use iAudioInterface2.

Note that the every time you exit AudioTools, iAudioInterface2 will be set to the configuration

stored on the General->Configuration screen.

Line Input

The line input connector is a ¼” TRS connector,

which may be set up as a stereo unbalanced line

input, or a mono balanced line input capable of

handling -90dBu to +40dBu in three ranges.

Make sure that you first select the correct

input range before connecting a high-level

input to this connector.

This input is configured as a mono balanced line

input by default, and used in this mode in almost

all functions in AudioTools. In stereo mode, the microphone input is disabled, and the connector is

configured as a stereo input jack. To set this mode for other 3rd-party Apps, go to the Settings-

>Configuration page, and enable stereo input.

iAudioInterface2 User Guide Page 7

The line input supports three ranges, -90 dBu to -10dBu, -70dBu to +8 dBu, and -35 dBu to +40

dBu. These input ranges are available whether you are in stereo or mono mode.

Line Output

Outside of AudioTools, the output connector is configured as a stereo headphone jack by default.

For example, if you play music from your device, you will hear the music in stereo.

When the AudioTools App is running, in most situations, the output connector is configured as a

true balanced line output. Exceptions to this are cases where stereo audio is being played back, for

example in the Recorder module. The maximum output level is approximately +12 dBu in balanced

mode, and +6dBu in stereo mode.

Output Level Control

The level control may be used to set the output level, the input level, or may be disabled.

The output level control is enabled by default, but AudioTools will enable it during use for most

functions. Some functions, such as the Impedance Meter, will disable it to get repeatable readings.

You can control whether or not the level control is enabled once you leave AudioTools by setting a

preference on the Settings Menu->Configuration page.

Clip Indicators

AudioTools will normally indicate when iAudioInterface2 is clipping (level greater than the input is

capable of measuring correctly) by showing a red “clipping” indicator on the screen. In some cases,

where the input level is much greater than the current level range, the clipping indicator may not be

seen. If you are using auto-ranging, iAudioInterface2 will attempt to select the best range for the

running measurement. However, if you know the level of the input signal, it is recommended to set

the gain range manually.

The method for selecting the gain range varies, but usually it can be selected from the Setup page

for the function that you are running, either from the Input Select button, or from a control on the

Setup screen itself.

iAudioInterface2 User Guide Page 8

Microphone Input

The microphone input supports phantom

powered microphones, or unpowered

(dynamic) microphones.

The microphone input has six fixed gain

steps, from 0 dB to +50 dB. AudioTools

allows you to set different hardware gain

settings for each of two gain ranges: High

and Low. This lets you set one gain range

that is optimized for measuring low noise

situations, and the another for high-SPL

environments. Also, you can select auto-range, or either High or Low range.

If you know that the input levels that you are measuring will be in one of the gain ranges, it is

recommended that you select that range manually. The mic gain range may be set from the Setup

screen for the function that you are running, by tapping the Input Source button.

To set up the microphone input, go to the AudioTools Settings->Microphone Setup page, and then

select iAI Mic. From this screen, you are able to select a hardware gain range, turn phantom power

on or off, and enter a calibration constant for your microphone. These settings will be stored by

AudioTools and will be in effect whenever you start the App. See the Calibration section for more

information about hardware gain settings, and entering settings for more than one microphone.

Digital Audio Output (Optical)

The digital audio output provides an optical Toslink digital audio output which comes directly from

the iOS device digital audio. The bit rate and sample rate of this signal are set by the iOS device.

Currently, this is always stereo, 16 bit, and may be 32000, 44100, or 48000 Hz. No sample rate

conversion is ever done by iAudioInterface; the audio is passed through unaltered.

This output is off by default. It may be enabled or disabled from the AudioTools Settings->Line

Output Setup screen. If enabled, you will see a red glow if you look into the connector. This setting

controls the output while running AudioTools. To change whether or not it is enabled when you exit

AudioTools, see the Settings->Configuration screen. Keeping it off saves a small amount of power.

Use a standard Toslink cable to connect this output to any device which accepts standard optical

digital audio as an input.

iAudioInterface2 User Guide Page 9

Power

The power inlet connector will accept a 5.5mm plug with 2.1mm pin. It requires 12VDC-18VDC at

1.5A, pin positive. When the power adapter is plugged in, it will charge the internal battery, and any

iOS device that is also connected.

Charge Status Indicator

The charge status indicator will be off while charging the internal battery. It will turn on when the

battery is completely charged, but only when an iOS device is connected. It may flash if the battery

is faulty, overheated, or defective.

Dock connector cable

The dock connector cable is used to attach iAudioInterface2 to your device. Connect it only to an

iPhone 4, iPod touch 4, or iPad. The cable should be connected to the device before starting

AudioTools. Never use any dock-extender cable, as these are not approved for usage.

iAudioInterface2 User Guide Page 10

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