Why are linear phase EQs not the standard?
Why Linear Phase EQs Are Not the Standard
When it comes to equalization in audio production, there are various types of EQs available, each with its own characteristics and advantages. Linear phase EQs, in particular, have distinct qualities that set them apart from other EQ types. However, despite their unique features, linear phase EQs are not considered the standard in the industry. In this article, we will explore the reasons behind this and shed light on the practical considerations that influence EQ choice in professional audio production.
Latency and CPU Usage
One of the primary factors that contribute to the limited adoption of linear phase EQs is their inherent latency and high CPU usage. Linear phase EQs introduce greater latency compared to other EQ types due to their processing algorithms, which can delay the signal. This latency can be problematic in real-time applications such as tracking or in large, CPU-intensive mixing sessions. The additional processing time required by linear phase EQs can cause noticeable delays, making them impractical for scenarios where immediate response is crucial.
Pre-Ringing
Another factor that affects the preference for linear phase EQs is the phenomenon known as pre-ringing. Pre-ringing is an artifact that occurs when the EQ introduces a delay to the signal and the digital audio workstation (DAW) attempts to compensate for this latency. As a result, a reverse reverberated version of the sound can be heard at the beginning of transients, leading to a loss of punch and clarity. This pre-ringing distortion is particularly noticeable on transient-rich audio material and can negatively impact the overall quality of the sound.
Sound Coloration
Linear phase EQs are often criticized for their sound coloration characteristics. They are known for imparting a cold, digital tone to the audio, which may not be desirable in all musical contexts. Unlike other EQ types, linear phase EQs are not typically designed for pleasant tone shaping or adding warmth to the sound. Their primary focus is on maintaining the phase relationship and minimizing phase distortion, which can result in a more clinical and less euphonic sound character.
Specific Use Cases
While linear phase EQs may not be the standard choice for general audio processing, they do have specific use cases where their unique properties shine. One such application is when working with sounds recorded using multiple microphones or tracks, such as drum kit recordings or stereo-tracked instruments. In these scenarios, maintaining the phase relationship between the different audio sources is crucial to avoid phase cancellation and preserve the integrity of the sound. Linear phase EQs can be valuable tools in these situations, helping to ensure accurate phase coherence and minimizing phase-related issues.
In conclusion, linear phase EQs offer distinct advantages and are particularly useful in specific audio production scenarios. However, their limited adoption as the standard EQ type can be attributed to factors such as latency and CPU usage, pre-ringing artifacts, and their characteristic sound coloration. Understanding these considerations allows audio professionals to make informed decisions when selecting the most appropriate EQ type for their specific needs.
Sources:
- Music: Practice & Theory Stack Exchange. “Why are linear phase EQs not the standard?” (https://music.stackexchange.com/questions/94939/why-are-linear-phase-eqs-not-the-standard)
- Mastering.com. “Linear Phase EQ: The Dos and Don’ts of Linear EQ” (https://mastering.com/linear-phase-eq/)
- UAD, Apollo, and LUNA Forums. “Linear phase EQ – for mastering?! Really?!” (https://uadforum.com/community/index.php?threads/linear-phase-eq-for-mastering-really.33003/)
FAQs
Why Linear Phase EQs Are Not the Standard
What is the main drawback of linear phase EQs?
Linear phase EQs have greater latency and require higher CPU usage compared to other EQ types. This makes them unsuitable for real-time applications like tracking or in large, CPU-intensive mixing sessions.
What is pre-ringing, and why is it a concern with linear phase EQs?
Pre-ringing is an artifact that occurs when the EQ delays the signal slightly, and then the DAW tries to compensate for the latency. This can result in a reverse reverberated version of the sound spliced at the beginning of the transient, which can affect the punchiness of the sound.
How do linear phase EQs affect the sound coloration?
Linear phase EQs are known for imparting a cold, digital tone to the sound. They are not typically designed for pleasant tone shaping and may not provide the same coloration as other EQ types.
In which specific use cases are linear phase EQs beneficial?
While linear phase EQs have their advantages, they are not necessary for every situation. They are particularly useful when preserving the phase relationship of sounds recorded with multiple microphones or tracks, such as drum kit recordings or stereo-tracked instruments. In these cases, linear phase EQs can help avoid phase cancellation and maintain the integrity of the sound.
Are linear phase EQs suitable for real-time applications like tracking?
No, linear phase EQs introduce greater latency, which can be problematic in real-time applications where immediate response is crucial. They are not recommended for tracking or any scenario where low latency is required.
Do linear phase EQs affect the transient response of the audio?
Yes, linear phase EQs can affect the transient response due to pre-ringing artifacts. The reverse reverberated version of the sound introduced by pre-ringing can impact the punch and clarity of transients.
Are there any benefits to using linear phase EQs despite their drawbacks?
Linear phase EQs excel in situations where maintaining the phase relationship of multiple audio sources is critical. They can help avoid phase cancellation issues and ensure accurate phase coherence in recordings with multiple microphones or tracks.
What are the alternatives to linear phase EQs?
Other EQ types, such as minimum phase EQs, offer different characteristics and may be preferred for their lower latency, lower CPU usage, and more pleasing tone shaping capabilities. The choice of EQ type depends on the specific requirements and goals of the audio production.