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FabFilter Pro-L 2 – Limiter Plug-In Review




2018 01 05 0001

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FabFilter Pro-L 2 – Limiter Plug-In Review

FabFilter released in early December 2017 a new version of their already famous and widely used professional Limiter Plug-in. FabFilter Pro-L 2 is an endorsed true peak limiter. The previous version has been commonly used in the professional space. FabFilter Pro-L2 supports true peak level meters and extensive loudness metering with support for current standards like EBU R128, ITU-R BS.1770-4, and ATSC A/85. FabFilter granted a review copy with no strings attached.

About FabFilter

FabFilter is continually challenging and rethinking industry standards, FabFilter creates audio plug-ins with superb sound quality and innovative interfaces. FabFilter was founded in 2002 by Frederik Slijkerman and Floris Klinkert, based in Amsterdam, The Netherlands.


You install the filter and register the plugin by registering a specific code within the plugin. It is easy and straightforward.


The Pro L2 compared to the old version does improve the experience of using the limiter. The key features of the second version of FabFilter Pro-L 2 are the included four limiting algorithms, true peak limiting, new metering options, and a sidechain input.

FabFilter Pro-L 2 is an excellent limiter for transparent sound with the needed loudness depending on the source material or where you want to publish the music. New features include oversampling which has been increased from 4 times up to 32 times oversampling. The included loudness metering with support now EBU R128, ITU-R BS.1770-4, and ATSC A/85 standards.

FabFilter Pro L 2 80s mix

FabFilter Pro-L 2 adds four new limiting algorithms:

  1. Modern is the new ‘best for all’ algorithm that produces even better results than the Transparent and Allround algorithms from the first version of FabFilter Pro-L. It is a tremendous sounding mode.
  2. Aggressive is excellent for maximum loudness — operates very well for EDM, Hip-hop, Pop or rock music. This mode puts the track really in your face.
  3. A bus has been designed specifically for drums and limiting of individual tracks. It does color the sound; it is not clean or transparent.
  4. Safe’s goal is not maximum loudness, but to avoid distortion at all times.

Next new feature is accurate peak limiting, this Pro-L 2 feature detects true peaks in the input signal, and reduce them correctly.

For film scoring or any music/sounds that need to go on the big screen, FabFilter Pro-L 2 supports various surround audio including Dolby Atmos 7.0.2 and 7.1.2 formats.

The new audition limiting feature enables you to solo the real gain reduction signal that Pro-L 2 stamps on the master track. With this feature you can for example here how much Pro-L 2 changes the mix.

FabFilter Pro-L 2 on Film Score / Trailer

A composer who would need to master and mix their tracks can use FabFilter Pro-L 2 to get the right mastered track for the required media, for example, Vimeo or youtube.

FabFilter Pro-L 2 on Dance Music

To show off the different modes on a dance track. The LUFS in the Loudness meter was set to the targets -14 LUFS for streaming mastering as this video was planned to be released on YouTube.

FabFilter Pro-L 2 on extreme distorted Music.

This is not the typical use case, you would have the right mix to start with and need FabFilter Pro-L 2 to make sure your master is right for the platform which is streaming it. I did do this “strange” test to see what FabFilter Pro-L 2 can do with a crappy mix!

 FabFilter Pro-L 2 features:

  • Eight sophisticated, carefully tuned limiting algorithms, all with their character and purpose.
  • True peak limiting.
  • Up to 32x linear-phase, I am oversampling to minimize aliasing and inter-sample peaks.
  • Low CPU usage.
  • Highly accurate output and gain reduction metering, including accurate peak metering.
  • Extensive loudness metering with support for the EBU R128, ITU-R BS.1770-4, and ATSC A/85 standards.
  • Various meter scale settings, including K-System support.
  • Surround support, including Dolby Atmos 7.0.2 and 7.1.2 formats with flexible surround channel linking.
  • Unique, highly informative real-time level display, showing input, output, gain change, and loudness levels over time with critical gain reduction readings and four different display modes.
  • Optional DC offset filter.
  • Unity Gain option to easily listen to the effect of the current limiting at unity gain level.
  • Audition Limiting option to listen to the difference between the input and output signal.
  • Separate, freely-adjustable channel linking for both the transient and release stages.
  • Professional dithering with three different noise shaping algorithms.
  • Easy to set up for every day limiting situations with the included factory presets.
  • Adapts automatically to stereo, mono, and surround channel layouts.
  • Full-Screen mode for precise adjustments and insightful metering.
  • Multiple interface sizes: Small, Medium, and Large, as well as a separate Compact mode.
  • Retina support on OS X and High DPI support on Windows.
  • GPU-powered graphics acceleration.
  • Supports joint Pro Tools hardware control surfaces.

User interface & Usability

Fabfilter plugins are generally speaking all visually pleasing and come with and UI that supports you in your mastering or mixing task. The UI of FabFilter Pro-L 2  falls right into the category of offering a great UI that makes sense from a feature point of view and is delightful to work with. Retina resolutions are supported on OS X and High DPI support on Windows.

Fabfilter displays functionality instead of old hardware that is sometimes emulated in a plugin, a great approach and much more useful than showing an old equipment rack-mountable front end.

Rating:  Five out of five stars

FabFilter Pro-L 2 is the new standard Limiter Plugin and for many professionals the number one choice. The new features (compared to the first version) are advantageous and help you to master quicker in today’s changing environment where you have to deliver a master for a streaming, CD or meet another requested loudness standard.

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