Audio Formats: WAV, MP3, FLAC, AAC — Which Should You Use for Mastering?

Audio Formats: WAV, MP3, FLAC, AAC — Which Should You Choose?

Overview of audio formats

Lossless

Format	Compression	Quality	File size
WAV	None	Perfect	Large
FLAC	Yes (lossless)	Perfect	Medium
AIFF	None	Perfect	Large

Lossy

Format	Compression	Quality	File size
MP3	Yes (lossy)	Good	Small
AAC	Yes (lossy)	Better than MP3	Small
Opus	Yes (lossy)	Best	Smallest

WAV: the studio standard

What is it?

WAV (Waveform Audio File Format) is an uncompressed format and the standard in studio recording.

Parameters

• Bit depth: 16-bit (CD), 24-bit (studio), 32-bit float (processing)
• Sample rate: 44.1 kHz (CD), 48 kHz (video), 96 kHz (Hi-Res)
• Channels: mono, stereo, multichannel

When to use it

• ✅ Recording and processing in a DAW
• ✅ Mastering and mixing
• ✅ Uploading to a distributor (16-bit, 44.1 kHz)
• ❌ Casual listening (file size is too large)

FLAC: the ideal balance

What is it?

FLAC (Free Lossless Audio Codec) is lossless compression. Quality is identical to WAV, but the file is 2–3 times smaller.

Advantages

• Lossless — perfect quality
• Metadata — supports tags (title, artist, cover art)
• Open format — free, no licensing

When to use it

• ✅ Archival music storage
• ✅ Uploading to a distributor (an alternative to WAV)
• ✅ Hi-Res audio (24-bit, 96 kHz)
• ❌ Some players don't support it

MP3: the universal format

What is it?

MP3 (MPEG-1 Audio Layer 3) is the most widely used lossy compression format.

Bitrates

Bitrate	Quality	Use case
128 kbps	Basic	Podcasts, speech
192 kbps	Good	Everyday listening
256 kbps	Excellent	Music
320 kbps	Maximum	Critical listening

When to use it

• ✅ Listening on any device
• ✅ Podcasts and spoken-word content
• ❌ Mastering (re-compression degrades quality)
• ❌ Uploading to a distributor

AAC: the successor to MP3

What is it?

AAC (Advanced Audio Coding) was developed as a replacement for MP3. It delivers better quality at the same bitrate.

Where it's used

• Apple Music — the primary format
• YouTube — AAC for video
• Spotify — Ogg Vorbis (a similar algorithm)

When to use it

• ✅ Exporting for Apple/iTunes
• ✅ Video content (YouTube)
• ❌ Mastering (use WAV/FLAC instead)

Opus: the best lossy format

What is it?

Opus is a modern compression format that performs best at low bitrates.

Advantages

• Best quality at 64–192 kbps
• Low latency — ideal for streaming
• Open format — free

When to use it

• ✅ Streaming and VoIP
• ✅ Web applications
• ❌ Not all players support it

What should you use for mastering?

Uploading to a distributor

Format: WAV 16-bit, 44.1 kHz
Or: FLAC 16-bit, 44.1 kHz

Listening

At home: FLAC or WAV 24-bit
On the go: MP3 320kbps or AAC 256kbps
On headphones: AAC 256kbps (Apple) or Ogg 320kbps (Spotify)

Podcast

Export: MP3 128kbps (mono) or 192kbps (stereo)
Upload: WAV 16-bit (the distributor will transcode)

Archive

FLAC 24-bit, 96 kHz (Hi-Res)
Or: WAV 24-bit, 48 kHz

Bit depth: 16 vs. 24 vs. 32-bit

16-bit (CD quality)

• Dynamic range: 96 dB
• Sufficient for: the final master
• Quantization noise: audible during quiet passages

24-bit (studio standard)

• Dynamic range: 144 dB
• Sufficient for: recording, mixing, mastering
• Quantization noise: inaudible

32-bit float (processing)

• Dynamic range: ~1500 dB
• Used for: internal processing inside a DAW
• Advantage: clipping during processing is essentially impossible

Sample rate: 44.1 vs. 48 vs. 96 kHz

44.1 kHz (CD standard)

• Nyquist frequency: 22.05 kHz
• Sufficient for: music (audible range 20 Hz–20 kHz)

48 kHz (video standard)

• Nyquist frequency: 24 kHz
• Used for: video, film, TV

96 kHz (Hi-Res)

• Nyquist frequency: 48 kHz
• Advantage: cleaner processing (less aliasing)
• Size: 2x larger than 48 kHz

Magic Master's recommendations

Magic Master supports all major formats:

Format	Export	Bitrate
WAV	16-bit, 44.1 kHz	—
FLAC	24-bit, 44.1 kHz	—
MP3	16-bit → MP3	128/192/256/320 kbps
AAC	16-bit → M4A	192 kbps
Opus	16-bit → Opus	128/192 kbps

Dithering: TPDF or noise-shaped (E-weighted) for 16-bit exports.

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Try exporting in any format: magicmaster.pro/app