To create an HD WAV Master, your original unmastered audio file must be rendered at 24 bits or higher.
If your file was rendered at 16 bits, you’ll just need to render a 24 bit version from your DAW. This is because our engine can’t recover or create information that’s not included in your file!
HD WAV Masters will be provided to you at 24 bits, and will keep the same sample rate as your original file.
You can read more about audio file formats here.