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Mastering and Loudness Standards Flashcards

6 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the Apple Digital Masters (formerly Mastered for iTunes) specification, and what does it require from mastering engineers?

    Answer: A set of guidelines requiring 24-bit or higher resolution master files delivered to Apple, which are then encoded with high-quality AAC and verified for true peak and artifact compliance

    Apple Digital Masters requires delivery of 24-bit (or higher) master files to Apple, which encodes them to AAC using a high-quality encoder. Engineers must supply high-resolution files free from true peak clipping (verified with AURoundTripAAC or similar tools) to ensure the encoded file sounds as intended.

  2. What does 'DDP (Disc Description Protocol)' image format deliver in CD mastering?

    Answer: A complete CD master package including audio, PQ subcode data (track markers, ISRC codes), and Text information, used for manufacturing CD replication

    A DDP image is the standard delivery format for CD replication. It contains all audio data, PQ subcodes (defining track start/end points, ISRC codes), and CD-Text in a complete disc image format that replication plants use to manufacture CDs without the error risks of physical disc masters.

  3. What is the purpose of 'stem mastering' compared to traditional stereo mastering?

    Answer: It provides the mastering engineer with grouped stems (drums, bass, vocals, etc.) allowing targeted processing per stem while maintaining overall control for a more refined result

    Stem mastering uses grouped audio stems (rather than a single stereo mix) as the input to mastering. The engineer can apply different EQ, compression, or limiting per stem, providing much greater ability to fix mix issues (e.g., overly loud bass, harsh vocals) than is possible from a single stereo file.

  4. What is 'harmonic saturation' or 'tape saturation' used for in mastering?

    Answer: To add subtle even and odd harmonic distortion that adds perceived warmth, density, and loudness without heavy limiting

    Harmonic saturation (from tape emulators, analog-modeled saturators, or transformer modeling) introduces soft-knee even/odd harmonic distortion that psychoacoustically increases perceived loudness and warmth without the transient destruction caused by heavy brickwall limiting. It is a common mastering tool for adding analog character.

  5. What does the 'PLR' (Program Loudness Range) metric indicate in a mastered track?

    Answer: The peak-to-loudness ratio: the difference between the maximum true peak level and the integrated loudness, indicating the remaining dynamic headroom

    PLR (Peak-to-Loudness Ratio) = maximum true peak (dBTP) − integrated loudness (LUFS). It indicates how much dynamic headroom exists between the loudest peak and the average program loudness. A PLR of 1 dB indicates a heavily limited, crushed master; 10+ dB indicates good dynamic preservation.

  6. What is the purpose of 'mid-side stereo enhancement' in mastering, and what are the risks of overuse?

    Answer: It boosts or manipulates the side channel to increase stereo width; overuse can cause phase problems and an unnatural stereo image that collapses to mono poorly

    M/S stereo enhancement boosts the side (L−R) channel to artificially widen the stereo image. While subtle widening can add openness, aggressive side boosting creates phasiness, unnatural widening with instruments that appear outside the speaker boundaries, and poor mono compatibility — sounding hollow or losing elements when summed.