PRE-MASTERED FILE REQUIREMENTS
- Full-resolution WAV or AIFF files
- Sample rate: 44.1 kHz minimum, 96 kHz maximum
- Bit depth: 16-bit minimum, 32-bit maximum
- Submit a 24-bit minimum file if you are seeking “Mastered for iTunes” branding (see below).
- No compression or peak limiting on master fader
- If you would like to submit a compressed/limited version so I can get an idea of your vision, please do so. Please clearly label which is which. The example file does not have to be a full-res.
- Maximum -3 dB peak
- Notify me of your intended release platform(s)
Mastered for iTunes (MFiT)
Because it provides for better sound, I will do the steps on your master to make sure that your files would qualify for the MFiT label. iTunes has provided tools to verify what files will sound like after being converted to “lossy” formats like AAC/M4A and MP3.
Below are some guidelines copied directly from the MFiT Technology Brief.
- An ideal master will have 24-bit 96kHz resolution. These files contain more detail from which our encoders can create more accurate encodes. However, any resolution above 16-bit 44.1kHz, including sample rates of 48kHz, 88.2kHz, 96kHz, and 192kHz, will benefit from our encoding process.
- Don’t upsample files to a higher resolution than their original format. Upsampling won’t recover or add information to an audio file. Don’t provide files that have been downsampled and dithered for a CD. This degrades the file’s audio quality.
- Although iTunes doesn’t reject files for a specific number of clips, tracks which have audible clipping will not be badged or marketed as Mastered for iTunes.
- Sound Check is a feature in iTunes and all iOS devices that lets listeners hear all their songs at approximately the same volume. Because many such technologies are available to listeners, you should always mix and master your tracks in a way that captures your intended sound regardless of playback volume.