Audio files are only accepted as AIFF, WAV, FLAC (all preferred) or MP3 files. All audio files should be encoded with a sample rate of 44.1 kHz and in 2-channel (Stereo).
The bit rate for AIFF, WAV and FLAC should be 16-bit ;
MP3 files: bit rate should be between 128 kb/s and 320 kb/s.
Please note: While our master upload application will allow you to upload a 24bit file, 24-bit files are converted down to 16-bit when we make a DDP for manufacturing. While there is technically less resolution at 16-bit compared to 24-bit, if the files are “dithered” properly down to 16-bit they should sound fine. There should never be any distortion introduced as part of that process. Also, this is necessary as an Audio CD is only capable of reproducing 16 bit Audio.