This is achieved by the peak limiter at the end of the mastering chain working in a specific way. This can cause clips that may go unnoticed while mixing and mastering with regular sample peak meters.
It offers an additional layer of protection against peak overshoots that could be generated by the AAC compression and decompression process. This is where the new Digital Delivery Mastering option for Lurssen Mastering Console comes in. When checked with Apple’s tools specifically made for this purpose, masters with digital overs may be rejected. Apple’s Mastered for iTunes® criteria states that no clipping at or over 0.0dBFS should be present in the digital master to be submitted. Even though the file’s maximum peak level is not exceeding 0.0 dBFS, digital overshoots will still occur when the file is de-compressed back to PCM format for playback. As the tendency in contemporary digital music production is to go for super loud masters, distortion is created as a by-product of extreme use of digital peak limiters pushing up the level. Technically, files have to comply with high-resolution sample rate and bit depth requirements, but the most important aspect is peak level. Lurssen Mastering Console has a new Digital Delivery Mastering feature that provides you with mastered audio files that comply with Apple’s “Mastered for iTunes” specifications for sample rate, bit depth and peak levels, ensuring that your audio translates perfectly for compressed formats like AAC.ĭigital distribution and streaming services have become the current de-facto standard of music delivery to consumers, and engineers have started to put more care into the production of the final master to ensure that the quality of the audio, when compressed to AAC or other formats, is as close as possible to the original source file.įor this reason Apple has developed a set of best practices and tools that should be used for compliance to what has been labeled as “Mastered for iTunes®”.
If you are mastering your music for digital distribution and streaming services like iTunes®, Pandora® and Spotify®, Lurssen Mastering Console can ensure your music gets heard. Digital Delivery Mastering “Mastered for iTunes”
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