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FLAC Uncompressed Converting, Sound Quality [Definitive Guide 2019]



FLAC uncompressed is file contains Free Lossless Audio Codec content without size reducing. Read about sound quality and comparison with WAV, uncompressed FLAC settings in the audiophile sound converter software AuI ConverteR 48x44.

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Uncompressed FLAC vs WAV


There is hypothesis, that Free Lossless Audio Codec uncompressing process cause additional noise. Still there isn't serious research this subject.
To avoid uncompressing WAV format may be used.

Hypothesis to explain the sound difference:

When the compressed file format is umpacked, central processor unit of computer (or processor of a music device) have higher load. Therefore noise in the system by processor is higher and sound is degrade despite binary identical data coming to digital/audio converter (DAC).

How to check it:

It may be checked via spectral comparison of analog output of DAC during playback alternative formats.

However, there are may be some details, that should be accounted to avoid wrong results. Author think, that it is sound system implementation matter rather. And for exact answer to the question, serious researches are need for number of systems/devices.

However, WAV have displaying metadata (music track information and artwork(s)) issues at some players. Because WAV have no standard meta tag implementation and use custom data block with ID3 format.

FLAC have standard meta tag implementation and must be supported any player, that comparible with the format.

Both of these alternative formats have partitial compatibility of meta data. Though some issues due implementation may happen.

WAV vs FLAC format (uncompressed)

  FLAC uncompressed WAV
Sound quality Same to WAV (binary identical sound content) Same to FLAC (binary identical sound content)
Size Depend on metadata and frame size and about packed PCM sound data Depend on metadata and about packed PCM sound data
Metadata Standard FLAC's implementation like id3 or LIST chunks (data blocks). May have compatibility and display issues with some software and firmware


Watch and share: WAV and FLAC binary content comparison



FLAC uncompressed


FLAC uncompressed vs compressed

For sound quality no difference between compressed and uncompressed FLAC. Because any lossless file contains identical unpacked binary content for single original audio stuff.

There is theory, that FLAC uncompressing cause additional noise due higher computer load. But there is no safe evidences.


FLAC compression level settings


  1. At the main window of the software push Settings button.
  2. At the Settings window select General tab.
  3. Set compression level with FLAC compressing slider (most left position).
    Free Lossless Audio Codec uncompressed is most left position.
  4. Push OK button.

Settings: uncompressed FLAC

FLAC uncompressed settings



Size and binary content of FLAC files


FLAC is divided to frames. Frames may be assigned inside a conversion software. So different conversion utilities may have slightly different Free Lossless Audio Codec uncompressed file size.

Also padding (free space reserve) may cause various file size. The reserve is used to faster metadata saving without full file re-writing.

Unpacked binary audio content don't depend on converting tool and compression level.



Read more about FLAC


Read other articles about sound issues



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