CMP Mixing and Mastering Principles Questions and Answers 1 — Questions and Answers
Question 1: A mastering engineer is working on a dense electronic track and notices the kick drum is causing the main bus compressor to 'pump' excessively, ducking the high-frequency synths and hi-hats with every hit. Which of the following is the MOST effective technique to address this issue while maintaining overall dynamic control?
- Use a multiband compressor to apply compression only to the low frequencies. (Correct answer)
- Apply parallel compression to the entire mix bus.
- Increase the attack time on the full-band bus compressor.
- Use a de-esser to target the kick drum's transient.
Correct answer: Use a multiband compressor to apply compression only to the low frequencies.
A multiband compressor allows the engineer to split the audio into different frequency bands and apply compression independently to each. By compressing only the low-frequency band where the kick drum resides, the compressor can control the kick's dynamics without affecting the mid and high frequencies, thus preventing the 'pumping' effect on the synths and hi-hats.
Question 2: What is the primary purpose of using Mid-Side EQ during the mastering stage?
- To adjust the volume balance between the left and right speakers.
- To apply equalization to the mono (center) and stereo (side) information of a mix independently. (Correct answer)
- To automate EQ changes throughout the duration of the song.
- To correct phase cancellation issues between the kick and bass.
Correct answer: To apply equalization to the mono (center) and stereo (side) information of a mix independently.
Mid-Side (M/S) EQ separates a stereo audio signal into two components: the 'Mid' (mono sum, or what's common to both left and right channels) and the 'Side' (stereo difference, or what's unique to the left and right channels). This allows a mastering engineer to make precise EQ adjustments to elements in the center of the mix (like lead vocals, kick, and bass) without affecting the wide-panned elements, and vice-versa, providing powerful control over the stereo image and clarity.
Question 3: When mixing, a primary goal is to create a sense of depth and space. Which of the following is a common and effective technique for achieving this?
- Applying the same long-tailed reverb to every track in the session.
- Using a high-pass filter on reverb returns to remove low-frequency mud and create clarity. (Correct answer)
- Panning all instruments to the center to increase mono compatibility.
- Maximizing the gain on every channel to achieve the highest possible signal-to-noise ratio.
Correct answer: Using a high-pass filter on reverb returns to remove low-frequency mud and create clarity.
Low-frequency buildup in reverb can make a mix sound muddy and cluttered, obscuring the clarity of key elements like the kick and bass. By using a high-pass filter on the reverb return (auxiliary) channel, a producer can remove these unnecessary low frequencies, allowing the reverb to add space and depth without compromising the mix's low-end definition.
Question 4: A producer is preparing a final master for submission to major streaming services like Spotify and Apple Music. What is the primary reason for mastering to a specific integrated LUFS target (e.g., -14 LUFS)?
- To ensure the track is louder than all other songs on the platform.
- To prevent the streaming service's loudness normalization algorithm from turning the track down and potentially altering its dynamics. (Correct answer)
- To meet the technical requirements for high-fidelity audio formats like FLAC.
- To automatically add compression and limiting during the upload process.
Correct answer: To prevent the streaming service's loudness normalization algorithm from turning the track down and potentially altering its dynamics.
Streaming services use loudness normalization to provide a consistent listening experience. If a track is submitted with a much higher integrated LUFS level than the platform's target (e.g., -14 LUFS for Spotify), the platform will simply turn it down. Mastering to the platform's target ensures the track is played back at a level close to what the producer intended, preserving the intended dynamic range and impact without the service applying its own gain reduction.
Question 5: In a typical mastering signal chain, what is the logical order for the three most fundamental processors?
- Limiter -> Compressor -> EQ
- Compressor -> Limiter -> EQ
- EQ -> Compressor -> Limiter (Correct answer)
- Limiter -> EQ -> Compressor
Correct answer: EQ -> Compressor -> Limiter
The standard and most logical mastering chain order is EQ, then Compressor, then Limiter. First, a corrective EQ is used to balance the frequency spectrum and fix any tonal issues. Next, a compressor is used to 'glue' the mix together and control the overall dynamics. Finally, a brickwall limiter is placed at the end of the chain to increase the overall loudness to a competitive level and set the final output ceiling, preventing clipping.
Question 6: Which of the following describes the technique of 'serial compression'?
- Blending a dry, uncompressed signal with a heavily compressed version of the same signal.
- Using a compressor's sidechain input to trigger gain reduction from an external source.
- Routing a signal through two or more compressors, one after the other, in the same signal chain. (Correct answer)
- Applying different compression settings to different frequency bands of the audio.
Correct answer: Routing a signal through two or more compressors, one after the other, in the same signal chain.
Serial compression involves using multiple compressors in sequence on a single track or bus. This is often done to achieve smoother, more transparent dynamic control than might be possible with a single compressor working very hard. For example, a fast compressor might be used to catch sharp peaks, followed by a slower compressor to handle overall leveling.
CMP Mixing and Mastering Principles Questions and Answers 1
A mastering engineer is working on a dense electronic track and notices the kick drum is causing the main bus compressor to 'pump' excessively, ducking the high-frequency synths and hi-hats with every hit.
Which of the following is the MOST effective technique to address this issue while maintaining overall dynamic control?