User Guide
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COPYRIGHT NOTICE
General
•  iAUDIO is the registered trademark of COWON SYSTEMS, Inc.
•  This product is for home use only and cannot be used for business purposes. 
•  COWON SYSTEMS, Inc. has the exclusive copyright for this User Guide. It is prohibited to distribute this 
User Guide in part or in whole without permission. 
•  COWON SYSTEMS, Inc. has the copyrights for JetShell and JetAudio. It is prohibited to distribute or 
commercially use them without written permission from COWON SYSTEMS, Inc.
•  The MP3 files created with the MP3 conversion feature of JetShell and JetAudio can be used for personal 
use only and not for commercial or service purposes. Violating this regulation is in conflict with domestic 
copyright laws. 
•  COWON SYSTEMS, Inc. complies with the laws and regulations related to records/videos/games. 
Complying with all any other codified laws is the responsibility of the actual users.
•  In order for customers who purchased the product to receive specialized iAUDIO services, we recommend 
that they accomplish customer registration at http://www.iAUDIO.com. Various specialized benefits are only 
provided for members who have completed a lawful customer registration. 
•  The various examples, drawings and pictures included in this User Guide are subject to change without prior 
notice when new product enhancements become available. 
BBE Related 
•  BBE is produced by the license of BBE Sound, Inc.
•  BBE Sound, Inc. has the license rights for BBE under USP4638258, 5510752 and 5736897.
•  BBE and the BBE symbol are the registered trademarks of BBE Sound, Inc.
iAUDIO 4
All rights reserved by COWON SYSTEMS, Inc. 2003
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User Guide
iAUDIO 4
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Safety Instructions 
Do not use this product for 
purposes other than those stated 
in this User Guide.
This product uses a 1.2 -1.5V 
battery. Always use the rated AAA 
battery, and pay attention to the 
polarity when replacing the battery. 
Reusing a battery which has leaked 
is prohibited.
Take care not to cut your hands 
when handling the product 
box, User Guide, or parts.
If you disassemble or modify the 
product arbitrarily, you cannot 
receive free services, and may 
be excluded from the scope of 
service.
Pay attention to the USB cable 
direction when connecting this product 
to a PC.
If you connect the USB cable in the 
wrong direction, the PC or the product 
may be damaged.
Avoid using this product if the USB 
cable is bent severely or pressed by 
heavy objects.
If you smell a burning odor from the 
product or find it overheating while 
using it, remove the battery and 
contact our Customer Support Team 
or AS Center.
iAUDIO 4
Safety Instructions 
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Do not throw the product into
water or keep it in a damp place
for a long time. If you do this, it  is
classified as product failure by  ubmersion 
and you cannot receive free AS. 
Furthermore, even fee-based service from 
AS may not be possible and you may not be 
able to use the product any more. 
If you listen to this product at a 
high volume level for a long time, 
you may have problems with your 
hearing ability. 
Frequently back up important files. 
All the data stored in the product 
may be deleted during AS. The 
AS Center does not back up the 
files stored in the product. Please 
be advised that our company is not 
liable for any loss of data in the 
products entrusted to us for AS.
iAUDIO 4
Touching the product with 
wet hands may cause a 
malfunction. 
Do not remove the battery while 
the product is operating. Always 
remove the battery after making 
sure that the power is turned off. 
Note that malfunctions may occur 
if you use the product in places 
where static electricity occurs 
frequently.
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Table of Contents
1. iAUDIO
What is iAUDIO 4?
Package Contents
Product Features
Product Specifications
Name of Parts
Loading the Battery/Connecting USB Cable
LCD Display
Basic Operations 
Simple Operations by Mode
Detailed Features by Menu
Glossary
Troubleshooting
Using Buttons
Menu List
2. JetShell
What is JetShell? 
Connecting iAUDIO and Installing JetShell
JetShell Configuration
Spectrum Screen and Sound Effects
Sending MP3 files with iAUDIO
Deleting Files in iAUDIO
Initializing Flash Memory (Format)
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10
11
12
13
14
15
16
18
24
36
37
39
43
44
45
50
53
54
56
57
Table of Contents
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Converting Audio CD Tracks to MP3 Files and Directly 
Transferring Them to iAUDIO
Other Features
Installing and Using JetAudio
Guide to Firmware Upgrade
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61
64
65
iAUDIO 4
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What is iAUDIO? 
What is iAUDIO?  
iAUDIO is a unique brand of MP3 player produced by COWON SYSTEMS, Inc. It is a super mini portable 
digital  audio  device  that  plays  various  formats  of  sound  files,  including  MP3.  It  also  supports  FM  radio 
listening/recording, as well as voice recording and direct encoding through the built-in microphone and Line-In 
input jack. 
Elegant and Luxurious Design with High Portability
iAUDIO 4 has a super mini size with high portability, and boasts a luxurious and elegant design with a mostly 
aluminum surface on the outside which has excellent durability.
15 Hour Continuous Play with One Small Battery (AAA size)
iAUDIO 4 uses a super power-saving circuit, enabling a long play time of up to 15 hours with only one AAA 
battery. (Based on our company’s test environment.)
High-quality Voice Recording 
iAUDIO 4 provides superb-quality voice recording that is possible only by a professional voice recorder through 
its built-in high-quality microphone. You can record important meetings or lectures, which can be saved on your 
PC and played back when necessary. 
Direct Encoding (Line-in)
iAUDIO  4  provides  a  direct  encoding  features  that  accepts  output  from  an  external  audio  device  for  1:1 
recording. This means that iAUDIO’s 3.5 mm Line-in jack and the output jack of the external audio device can 
be connected with a two-way stereo cable for recording. With this feature, it can directly accept music input from 
an audio device such as a Walkman, an MD (mini disk), an LP phonograph, or a TV to convert and save them as 
various types of digital files in iAUDIO for future listening.
Listening to/Recording of FM Broadcast 
You can listen to FM broadcasts and record them at the same time. This feature is very useful for studying 
foreign languages. The recorded files can be listened to repeatedly. 
You can also save up to 20 radio frequencies as Preset stations with channel numbers. 
iAUDIO 4