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AuI ConverteR 48x44

Affordable Hi-End Converter Audio files
for audiophiles & music production

WAV, FLAC, AIFF, DSF, DFF, ISO, ALAC, WMA, APE, OGG, CUE, mp4, mp3, m4a,...

Optimizer audio for playback stereo and multichannel music via DAC and sound card

DSF, DFF, ISO, CUE input files - supported by Audiophil-E edition and above

Output DSF files supported only for edition PROduce-RD. Output DFF, ISO, CUE files don't supported.

Current version: 4.6 / 2015 Aug 28

Using AuI ConverteR 48x44 for home audio

Input DSF, DFF, ISO supported for Audiophil-E and above

Output DSF supported for PROduce-RD only

Metadata editing for PROduce-R and above

See detailed comparing table for editions...

Using AuI ConverteR 48x44 for music production


Input DSF, DFF, ISO supported for Audiophil-E and above

Output DSF supported for PROduce-RD only

Metadata editing for PROduce-R and above

See detailed comparing table for editions...

What advantages you may get with AuI ConverteR



AuI ConverteR 48x44 have several audio conversion modes





  • Bit perfect change format (WAV/AIFF/FLAC/ALAC to WAV/AIFF/FLAC/ALAC, ISO/DFF/DSF to DSF)

    for output sample rate same to input.
    It is lossless conversion for change format only;

  • Non-optimized mode (passed non ristricted range 0 ... half sample rate).

    It's traditional resampling mode;

  • Optimized mode (passed ristricted range 0 ... 20-24 kHz).

    For improving playback quality via digital analog converter (DAC).




Audio optimization mode


Audio file content is [useful music signal (0 ... 20 kHz)] + [ultrasound (all upper 20 kHz)].
It showed at left part of picture.


In traditional (non-optimized) resampling mode AuI ConverteR 48x44 pass from input to output half of sample rate. It showed in upper right part of the picture.

Here sample rate is minimal between input and output.


Example #1: input sample rate is 48 kHz, output sample rate is 88 kHz. Here minimal sample rate is 48 kHz. Frequency band passed to output is 48 / 2 = 24 kHz

Example #2: input sample rate is 96 kHz, output sample rate is 44 kHz. Here minimal sample rate is 44 kHz. Frequency band passed to output is 44 / 2 = 22 kHz


While no proof what we listen upper 17 ... 20 kHz. I.e. we don't listen ultrasound.

In ideal case analog part of apparatus (DAC, amplifier) have no non-linear distortions. And music and ultrasound pass to ears as into played back audio file.

For real apparatus we have non-zero non-linear distortions. It lead to infiltration/shifting ultrasound content to audible frequency range.

It made ultrasound audible but distorted. This phenomenon called intermodulation distortions.

Of course, audible signal distorted too.

In optimized mode AuI ConverteR 48x44 remove inaudible (ultrasound) content.

It fix audibility of distorted ultrasound.

Necessity of Optimized mode applying depend on used software, hardware and audio file content.

Optimized mode used by AuI ConverteR as default. Can be changed to Traditional (Non-optimized) mode in settings.



May be your audio system can more
without hardware upgrade?
During playback DAC resample audio file content to DAC's internal ("native") resolution.
Low sample rates (44 or 48 kHz) upsampled for improving quality of digital to analog conversion.

Sound quality music defined by quality of filtration into digital analog converter (DAC).
Better quality filtration achieved for combined digital+analog filtration at high sample rates. As example: at 352 or 384 kHz.

Also possible downsampling to allowable maximal sample rate of DAC in driver or audio player.
"Slow" accurate re-sampling algorithms consume significant number of computing resources.

As rule hardware decisions limited in computing resources. There are time limitation due "on fly" processing.

After upsampling, file's audio quality is not improved by itself. DAC work in optimal mode. Improving of sound quality is not guaranteed, of course. It depend on many factors. However you can assess conversion result with AuI ConverteR 48x44 FREE.

AuI ConverteR (in optimized mode) helps DAC supress distortions for high sample rates.

Resource limitation may be solved via offline conversion on PC.
Audio conversion software allow pre-convert music files to "native" audio resolution of DAC via "slow" accurate math.

It's desirable if DAC have non-oversampling capability. Audio player should support unchanged ("bit perfect") transfer audio data from file to DAC.

Some DACs and players don't support such modes. Here possibly to try seek "best sounding" sample rate / bit depth of used system (software/hardware player+DAC or portable audio device). And further convert audio file to that resolution.

AuI ConverteR 48x44 provide pro studio level of quality near theoretical limits.

Try improve sound of your audio system.
Right now convert your files to "native" (usual maximal) DAC's sample rate with AuI ConverteR 48x44 FREE. And made sound check.
Have you music playback
unstability and interruptings?
Optimization audio for playback (resampling) can be released via software/hardware player. The optimization demand significant computing resources for processing music "on fly".
It may be critical for some computers. Or take away the resources that simultaneously need other software.

Overload CPU lead to periodical interruptings of playback.

Interrupting may vary from almost hidden shortest to long pauses, clicks.
Pay attention to sound. Possibly reason of transparency decreasing in shortest almost inaudible interruptions.
For this case, decreasing quality of player's "on fly" processing may lead to improving sound quality in speakers.

Need balance between processing quality and computing load.
For avoiding interruptions used simpler math. It lead to some audio quality decreasing.

Sometimes impossible adjust processing quality for successful playback of certain files. As example, due absent necessary settings or processings's minimal requirements.

For offload computer during playback possibly accurate pre-convert files to native format of your DAC.
After it files will playback without spending computing resources for real-time audio conversion (if such mode allowed by your audio player).

Try fix music playback unstability and interruptings.
Convert with AuI ConverteR 48x44 FREE audio file to target sample rate (optimal for DAC) provided by your audio player.
Convert music to format compatible with network audio player or software player
Accurate prepare files to native audio format of your hardware with "heavy" exact processing
Accurate convert high resolution music for vehicle and portable HiFi
Portable and vehicle audio can support limited range audio formats (type file, sample rate, bit-depth). Even this stereo support lossy formats only.
So you want convert home music library files with minimization of quality losses. For this fit high precision AuI ConverteR 48x44

Audio quality same for all editions

Lite ($33.5*)

Audiophil-E ($109.7*)

PROduce-R ($147.8*)

PROduce-RD ($249.8*)
Support output DSF
True Gapless Conversion
seamless album converting
Support FLAC/AIFF 32 bit
Support 352/384 kHz
Metadata editor
Adjust output file loudness
Invert phase audio
Support input DSF, DFF, ISO (1-bit HD audio), CUE+audio files
Simultaneous processing several files (MultiCPU)
9 codecs
more 9 codecs
no-pre ringing capability (mininum phase filter)
*All prices without EU VAT (added to price for EU only). Full comparing table of editions...

Why AuI ConverteR 48x44?

Key Features

Confidence in audio quality
AuI ConverteR 48x44 is HiEnd integrated audio file converter & CD ripper & metadata editor with wide range of prices from very affordable
Optimize music for DAC: "heavy" offline converting to format (1-bit/PCM, sample rate, bit-depth) non-changed by DAC (if your DAC able for it, read DAC manual) or with better sound
Convert WAV/FLAC/AIFF/... to DSF (1-bit high resolution audio) file format***
Convert input DSF/DFF/ISO files to DSF, WAV, AIFF, FLAC (16 / 24 / 32*** bit), ALAC, mp3, etc.*
Adjust volume** of output file with precision 0.1 dB
Sample rate and bit-depth conversion audio quality for all editions exactly the same most expensive AuI ConverteR 48x44 PROduce-RD used for HiEnd systems with cost tens thousands dollars and more

Audiophile Inventory's own high precision audio algorithms
alphaC - own AuI's high accurate sample rate and bit-depth conversion algorithm (up to 352/384** kHz). Manually tuned resampling filters. Individually for each in/out sample rate combination.
alphaD - own AuI's gentle dithering algorithm. For opening subtlest details of 16-bit music.
alphaS - own AuI's low distortion and noise sigma-delta modulation (DSF audio file format - 1-bit/D64/D128/D256/D512) algorithm (PROduce-RD)
trueG - True Gapless Conversion - own AuI's seamless conversion of album's tracks, including ISO 1-bit audio conversion (PROduce-RD)

For converting operas, live concerts, albums with non-zero levels between tracks, include ISO 1-bit audio source. True Gapless Conversion allow avoid clicks and gaps between tracks due all tracks converted as single stream.
Ease using and stability
Simple user interface easy even for novices: OPEN - select FORMAT - CONVERT
Safe, stable work
Time economy with full power of computer
Batch audio conversion with simultaneous (multi-CPU)* converting several files
Meta tags
Builtin metadata editor (track name, album, year, picture,...) dsf*. Group edition
Preserve metatags dsf*, flac, wav, aiff, wma, mp3
Auto store picture (like to cover.jpg, folder.png, etc.) from source file's folder to metadata
Keep structure library during batch converting
Recreate structure of directories output files like input files (example: cd artist/cd album)
Convert multiple input format simultaneously to single output format
Adjust AuI for yourself
Flexible customization of codecs. As example, you can use favorite mp3 command line codec with user fiendly graphical interface of AuI ConverteR 48x44, adjust suitable conversion quality
Use AuI with other software
Use AuI ConverteR 48x44 as command line* conversion utility for other audio software
Compatible with latest operation systems
Support of latest versions of Windows and Mac OS X (including OS X Yosemite 10.10)
You are not alone with software
Reliable and fast technical support
* - for Audiophil-E edition and above
** - for PROduce-R edition and above
*** - for PROduce-RD edition

Press about AuI ConverteR 48x44


Roland Krammer
Crayon Audio GmbH
Republic of Austria,
AuI ConverteR 48x44
since 2012
...we use AuI ConverteR 48x44 software, so that we can provide right examples...

...The dither generated music data that sounded more fine then the original...
  "We do develop and built high end HiFi devices like integrated amplifier, power amplifier, phono preamplifier, pre amplfier, cd-player and audio streamer. We attach particular importance to maximum spatial resolution, but avoid the typical harshness sound in semiconductor amplifiers and digital equipment. ...

  Since our CD player can play FLAC encoded files up to 96KS, we use AuI ConverteR 48x44 software, so that we can provide right examples. ..."

  "...After many attempts to get my music data in the correct format, I discovered the positive characteristics of the dither function of AuI. I converted different music samples with dither. Burned the data with and without dither on CD and show this also to my colleagues in my branch. There was not one among them who could say something different as I'm. The original and the with the dither function converted samples sounded different.

The dither generated music data that sounded more fine then the original. The attacks in side instruments had more dynamic. The space was more clear. A decaying sound was to be heard longer, right down to the quietest passages. The whole sound had gained. But frequency analyzes indicated no difference, although you can hear differences. ..."

David Roush,
The USA,
AuI ConverteR 48x44
since 2014
...AuI was one of the few converters that had the options I wanted, especially 32 bit...
  "I have spent a lot of money building a stereo system including a water-cooled media server. I have several thousand CDs that I am ripping. There is a big difference in sound quality between lossless uncompressed files (WAV) and lossless compressed files (WMA). I started with WMA due to the difference in file size compared to WAV. In the past, data storage was not inexpensive and 2 TB discs were the maximukm size you could buy. Now storage is getting cheaper and 4TB hard drives are becoming common. Now I am looking into converting the files to WAV.

It is becoming apparent that 32 bit is the way of the future, so no sense in buying software that does not handle 32 bit (same with a DAC). The AuI was one of the few converters that had the options I wanted, especially 32 bit.

About communication with Audiophile Inventory's team: Excellent and immediate responses."
Emil Serafino,
The USA,
AuI ConverteR 48x44
since 2014
...So I find myself using Aul ConverteR all the time for multiple audio needs...
  "Infact I stumbled across your software while looking for a DSF to PCM converter for Windows before the RD version ever came out. I could only find Open Source Linux and Mac Software, one without a GUI and another with a very suspect one.
Best part about it is, IMO it is a superior sample rate and format converter than using my wave editor... So I find myself using Aul ConverteR all the time for multiple audio needs.
AuI ConverteR is an invaluable tool for converting my ... (1-bit HD audio disks [AuI's remark]) to lossless PCM WAV/AIFF or FLAC format so they can be interpreted by my non ... (1-bit HD audio [AuI's remark]) compatible ... 24/192 portable DAC and ... Headphone Amp for enjoying audiophile grade sound on the go."
Andrew Kruchinov,
music lover
The Russia,
AuI ConverteR 48x44
since 2013
...In previous versions there were "bugs" that the program developer fix fairly quickly...
  "I'm experienced music lover. Thus I prefer possible most qualitative of available formats.
   With the variety of free and paid converters for hi-res lossless files, high qualitive ones is unitary.

    I use AuI ConverteR 48x44 almost a year. In previous versions there were "bugs" that the program developer fix fairly quickly. What does the author's desire to constantly improve the software.
    All statements on the official website and the features of the software corresponds to the actual results obtained.

    Currently AuI ConverteR 48x44 is a priority program for converting of files. Especially for high-resolution audio.

    From my own experience I recommend use the software for all music lovers and interested professionals."
Hans Daudey
The Netherlands,
AuI ConverteR 48x44 pro
since 2011
...With a few mouse clicks I convert a directory map of flacs to a submap with converted files...
  "I use the AuI ConverteR 48x44 pro for the conversion of 192 khz / 24 bits flac files from ... to 96kHz / 24 bits flacs which are required for my ... (audio card [AuI's remark]). I use the default settings. With a few mouse clicks I convert a directory map of flacs to a submap with converted files. "
Sergey Bobrov
AuI ConverteR 48x44
since 2013
...Audiophile Inventory willingly and promptly responds to requests about found shortcomings...
  "AuI ConverteR 48x44 software is a unique tool. I like its quality of audio processing more than many well-known professional software products.

Audiophile Inventory willingly and promptly responds to requests about found shortcomings. Very quickly and efficiently fix it in newer versions."


about AuI ConverteR 48x44

I don’t heard before about AuI ConverteR. Why I must trust it?
You can download free version.
Functionality of FREE version has some restrictions: batch converting, as example (full comparing list of free and paid options see below).
But sound quality of FREE version is FULL. You can try it before buying.
AuI ConverteR permanently improved (new functionality and audio algorithms).
It's live project. You can see date and number latest version in page

Read opinions.
There are a lot free audio converters. Why me purchase audio converter?
You can use any free audio converter. It save your money.

But there is not ideal software:
- with full functionality,
- without bugs (errors of work),
- with actual codecs.
Sometime you need convert a lot files. But conversion it is impossible due bug of converter. It's real life, unfortunately :(

Often developers of free programs haven't time for technical support of each user (fix bugs, advices, release some suggestions and other).
You need to look for a new conversion software.

Sometime you need use several free utilities (command line also) for achieving of result.

With AuI ConverteR 48x44 you get:

1. User friendly integrated decision (CD converter + audio resolution converter + file format converter).

2. sureness in sound quality.

3. guaranteed technical support during 1 year after purchasing.

You can use your favorite command line tool with AuI ConverteR.
I can choose other non free audioconverter. Why me need purchase AuI ConverteR 48x44?

AuI ConverteR 48x44 is hi-end converter audio files
        for playback converted files on HIGH DEFINITION APPARATUS

hi-end apparatus

Also it's:
1. live project permanently tuned for modern demands,
2. integrated tool for multiformat audio conversion,
3. simple in using software with user friendly interface,
4. software with reliable and competent technical support.

What warranty I get with purchased software?

Owners of purchased versions have priority and guaranted service in Standard Warranty term.
Standard Warranty term for AuI ConverteR 48x44 is 1 year after date of purchasing.

hi-end apparatus

If you find a bug, simply write to technical support. We will fix the bug as soon as possible (usually 1-5 days).

Sometime bugs appear due corrupted source audio files or other circumstances beyond our control.
If it possible we try to learn AuI ConverteR 48x44 pass troubles of corrupted input files or other. Or find other decision.

You can ask any questions about AuI ConverteR software, get advices how use it and send us any suggestions for improving the software.

About updates of new versions read here.

Can I get new updates free?

If you purchased (as example) version 3.4 — you get all minor updates 3.x.x (as example: 3.4.1, 3.4.2, 3.5, …. , 3.8.1, ...) absolutelly free.

But version 4.0 and above (major updates - changing first digit of version number) you must purchase again.
It need for support of development of new functionality.

You can save money by purchasing Extra Warranty with AuI ConverteR 48x44 ($50, and Extra Warranty discount 10% for purchasing with AuI ConverteR 48x44 Audiophil-E or PROduce-R).

Term of Extra Warranty is 1 year after date of purchasing.
You get all updates (minor and major for purchased version - Audiophil-E, PROduce-R) absolutelly free. Major update appear usually 1 time per year.


1. BUGS finded by users (in warranty term) FIXED in MINOR updates.

2. If you owner of AuI ConverteR 48x44 PROduce-R with Extra Warranty — you get ANY NEW UPDATES absolutely FREE during term of Extra Warranty.

hi-end apparatus

You can buy Extra Warranty with AuI ConverteR.
Into term of action of Extra Warranty, you can buy Extra Warranty for next year (after end of term of current Extra Warranty).

How uninstall AuI ConverteR 48x44

Under Windows

1. Open "Control panel"
2. Open Add or Remove Programs tool
3. Double click on row "Audiophile Inventory ConverteR 48x44"
4. Follow instructions of uninstall master.

Under Mac OS X

1. In Finder open folder "Application" (or other folder where you install AuI ConverteR 48x44)
2. Open context menu and select "Move to trash"

Order AuI ConverteR optimal for you






Output DSF D64/128/256/512 2 sec silence in middle file
≥ 3 min
Input DSF, DFF, ISO 2 sec silence in middle file
≥ 3 min



True Gapless Conversion        
FLAC/AIFF 32 bit        
Lossless formats WAV, FLAC, AIF, AIFF, AIFF/sowt, m4a (ALAC), APE
Lossy formats mp3, WMA, m4a (aac), mp4 (aac), ogg, DTS, ac3
CD ripper get CD info from Internet 1 track
Input CUE + file    
Support meta tags (album and track name, artist, etc.)  
+DSF, FLAC tag editor
Batch processing of group of files  
Multiple files in parallel
Multichannel files (more 2 channels) output
≤ 3 min
Output volume adjust      
Inverting phase audio      
Input / output sample rates 352, 384 kHz
Input / output sample rates 22, 44, 48, 88, 96, 176, 192 kHz
Bit-depth samples of input files: 16, 24, 32, 64 integer and 32, 64 floating point
Bit-depth samples of output files:  
        16 and 24 bit
        32 bit     
        32 bit (floating point)
        64 bit and 64 bit (floating point)      
alphaC sample rate and bit-depth conversion algorithm
alphaD dithering algorithm
Audio processing 64-bit floating point
External format converters of files (download codec by demand, user can add own extensions) 9 only 9 only
Support extensible WAV-file's formats (sampler's notes, BWF - Broadcast Wave Format etc.)      
Support WAV 64-bit (RF64) format (size more 2 gigabyte)  
Search files by sample rate, bit-depth, format
No pre-ringing (minimum phase filter)
Launch via command Line    
Possible start more one instance of application simultaneously    
Additional skins, editing and creating custom skins  
Count skins   10 10 10
Commercial using  
Extra Warranty    

All prices without VAT


Feedback form. You can seek answer your question here (F.A.Q.).

Write your questions, suggestions and other here anytime, please. Also contact e-mail

We processing and answer your posts during 5:00 ... 20:00 GMT everyday.

Thank you for understanding.

Your name:

Text of message:


How fully reset AuI Converter?

Under Windows

1. Login under your user (where you install and use AuI ConverteR)

AuI ConverteR must be stopped.

2. Turn ON in Explorer (or your file manager) show hidden paths and files.

3. Delete directory:

     <CURRENT USER NAME> - name of logged user

    C:\Users\<CURRENT USER NAME>\AppData\Local\ConvProQT

 4. Empty the Windows Recycle bin



Under Mac OS X

1. Login under your user (where you install and use AuI ConverteR)

AuI ConverteR must be stopped.

2. Turn ON in Finder (or your file manager) show hidden paths and files.

3. Delete directories:

     <CURRENT USER NAME> - name of logged user

    3.1. /Users/<CURRENT USER NAME>/Library/Caches/com.audiophile-inventory/AuIConverteR48x44

    3.2. /Users/<CURRENT USER NAME>/Library/Application Support/com.audiophile-inventory/AuIConverteR48x44

    3.3. /Users/<CURRENT USER NAME>/Library/Saved Application State/com.audiophile-inventory.AuIConverteR48x44.savedState

4. Delete file:

    /Users/<CURRENT USER NAME>/Library/Preferences/com.audiophile-inventory.AuIConverteR48x44.plist

5. Secure empty the Mac's Trash via menu of Finder

6. Restart Mac OS X.

How reset codecs?

Reset input decoders

1. In AuI Converter's main window push button Settings. Appeared Settings window.

2. In Settings window click to Input Formats tab.

3. Click Default button.

4. Click OK button at bottom of Settings window.

5. Restart AuI ConverteR 48x44.



Reset output encoders

1. In AuI Converter's main window push button Settings. Appeared Settings window.

2. In Settings window click to Output Formats tab.

3. Click Default button.

4. Click OK button at bottom of Settings window.

5. Restart AuI ConverteR 48x44.



How re-enter license key?

Note: works only for non-free versions


1. Start AuI ConverteR 48x44.

2. Push key sequence <Ctrl>+<F11> (under Windows) or <Ctrl>+<fn>+<F11> (under Mac OS X). Appear license key window.

3. Input license key or select licens key file.

5. Push OK button.

6. Restart AuI ConverteR 48x44.

Converted WAV isn't opened via my software

1. Check size of output file.

1.1. If size more 2 GB - AuI ConverteR default assign to file format WAV RF64.

Warning: next recommendation does not correspond WAV specification. Possible some troubles. Also possible appear bugs in external command line output encoders linked with AuI ConverteR (mp3, alac, wma, etc.)

1.1.1. In AuI ConverteR's main window push Settings button.

1.1.2. In Settings window click General tab.

1.1.3. Turn ON checkbox "Force 32-bit WAV (ON - long files possible truncated, not recommended)".

1.1.4. Push OK button.


1.2. If size less 2 GB - AuI ConverteR assign tragitional file format WAV.

1.2.1. Push Settings button in AuI ConverteR's main window.

1.2.2. In Settings window click General tab.

1.2.3. Turn one (or all) checkboxe(s) ( a. is most important )

    a. OFF - "Force unknown chunks or tags (for some software possible troubles)".

    b. ON - "No markers RF64".

    c. ON - "No id3 metadata (track name, album, performer, etc., not recommended)".

1.2.4. Push OK button.


2. Contact us, please.

Describe in request:

What playback software you use.


Converted file is quiet or has no sound

1. Check volume correction value.

1.1. In AuI ConverteR's main window (left upper part) click Parameters tab.

1.2. Click Reset button.

1.3. Try convert.


2. Contact us, please.

Describe in request:

a. Input file format: file extension (type), sample rate, bit depth.

b. Output file format: file extension (type), sample rate, bit depth.

c. What playback software you use.


Progress of conversion at zero during long time

1. In AuI ConverteR's main window (left upper part) click Log tab.

2. If in log panel runs rows, wait (up to 1 hour and more for large files) for begin of progress growing.

3. If in log panel no changes during several munutes:

3.1. Reset AuI ConverteR (see below).

3.2. If after reset conversion fault, copy log panel content and send us.


Reset AuI ConverteR for checking malfunction

1. Reset input codecs. Restart AuI ConverteR.

2. In AuI converteR's main window push Open button, select file, click Open (in open file dialog), wait appearing of download codec request window.

Download codec request window

3. If you use format other then WAV, FLAC, AIFF, DSF and download window isn't appeared contact us (let us know what input format you use).

4. Click OK. Wain for end of downloading and installing. Open log panel, copy its content (installing log) and send us (if will converion bug in next steps).

5. Start conversion.

6. If progress in zero again, copy log panel content (converting log) and send us.

7. Restart AuI ConverteR 48x44. Warning: don't start conversion (start log will eliminated)!!!

8. Open log panel, copy its (launching the software log) content and send us.
In general we must send us: a. Installing log (goal 4.) b. Converting log (goal 6.) c. Launching the software log (goal 8.)


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