The Classic Master Limiter plugin is specially designed to boost the overall level of your final mixes, but can also be used on very dynamic instruments. Features: Loudness maximizing. Brick wall limiting. Automatic makeup gain. Very low CPU usage. Supports sampling rates up to 192kHz. Full VST automation. Kjaerhus Audio Classic Series is a collection of free VST audio plugins made by Kjaerhus Audio. The Audio Classic Serie is a bundle of Kjaerhus 9 Classic Serie mixing and mastering audio plugins.
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As I cover in my new course Mastering in the Box, there are some incredible plugins available for anyone interested in computer-based mastering. Although nothing can replace an experienced engineer, working in an expertly designed room, on high-end equipment, there are some fantastic free tools available online that will aid engineers working on projects with limited budgets.
Here are some completely free plugins that you can work into your in the box mastering workflow …
1. Voxengo SPAN
As I cover in the course, Metering is absolutely essential to mastering, and SPAN is a versatile and free utility plugin.
It provides spectral analysis, correlation metering and clipping detection, as well as displaying RMS and max crest factor. The interface is simple, clear, and even somewhat customizable. It’s a truly deep, accurate and useful metering plugin, which is refreshing considering that it’s free. It’s also compatible with virtually every DAW.
2. LoudMax by Thomas Mundt
Described as “a look-ahead brickwall loudness maximizer plugin with a clean transparent sound, designed to retain the original character of the music as much as possible even at high compression levels,” LoudMax is a wonderfully simply tool. It has two sliders: threshold and output — and that’s all it needs.
If you’re interested in learning how a limiter works and affects your material, LoudMax boils the concept down to its most basic elements, all while providing a mostly transparent sound.
3. Limiter №6 by Vladg Sound
This is a more complex and versatile take on limiting. It offers more control than LoudMax, which can be helpful if your program material requires detailed tweaking.
Its five modules include: RMS compressor, peak limiter, high-frequency limiter, clipper, and true peak limiter.
Each of these modules have extremely flexible controls. There are some expensive and well-known limiter plugins that don’t come with features like mid-side processing, oversampling and true peak detection. The fact that these features come included with Limiter №6 makes it even more special.
4. mvMeter from TBProAudio
I’m still pretty shocked that this plugin is free. It looks great, it’s easy to use, and it’s deeper than some metering tools that cost hundreds of dollars more. It allows you to measure PEAK, RMS, EBU R128, VU and PPM. Additionally, it has multi-channel metering so you can see what’s happening on the stereo, left, right, mid, or side channels.
The five different themes allow the user to change the look to various classic VU and PPM Meters, which is a nice touch. (It doesn’t improve the sound quality — I prefer the sleek look of the retro skin.)
5. Stereo Tool v3 by Flux
Some mixes require a bit of balancing the information spread between the channels, and Stereo Tool v3 is prefect for this application. It includes panning controls for the left and right channels, a vector scope display, global stereo width and pan controls, PPM Input and Output meters, a phase correlation meter, and a variety of other useful features.
If the content you’ve been delivered has balance and phase issues, this is an excellent free plugin.
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6. Voxengo Marvel GEQ
Being able to sculpt your signal using an equalizer is essential for a mastering engineer. This linear-phase 16-band graphic equalizer is impressive in both functionality and sound.
I’m not sure why every plugin doesn’t have an “undo/redo” function, because after using this equalizer, I find it to be quite helpful. Being able to work in mid-side mode allows the user to treat information in the center separately from the sides, which, when used properly, can result in a much clearer stereo spread, and a more defined space amongst individual elements.
As with each of the great tools on this list, it’s surprising that such a useful tool is free.
I generally believe that in audio, you get what you pay for, but each of the aforementioned plugins are exceptions to this rule.
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As I cover in my new course Mastering in the Box, there are some incredible plugins available for anyone interested in computer-based mastering. Although nothing can replace an experienced engineer, working in an expertly designed room, on high-end equipment, there are some fantastic free tools avai
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Let’s get your mixes sounding loud and clear with the best mastering limiter plugin software.
While practically any limiter could do for mastering purposes, professionals and “those in the know” tend to rely one or another to get the sound right.
We’ll list of the 5 that are most in demand, and pick the top choices for you.
Quick answer: PSP Xenon is our top pick, but the super popular Fabfilter Pro-L is also a great option to get (it’s also cheaper).
The rest of this article goes into each plugin more in-depth, listing the features, the good, the bad, and the ugly.
Now let’s take a closer look 🙂
Table of Contents
Find more great gear here:
Mastering Limiter Plugins Buying Guide
What is a limiter?
A limiter, like the compressor, is another one of those plugins that many attribute a lot of mystery to. Primarily because, to some, it’s a mystery how they work.
If you looked at the compressor plugin guide, or the post on how compressors work, you will come to much of a similar definition of how a limiter works…
Definition:
A limiter plugin is a dynamics processor that restricts or “limits” the level of a signal to a specific threshold. Essentially a type of compressor, a limiter prevents the signal from exceeding the predefined threshold entirely.
So in contrast, compressors will reduce the dynamics range of the signal gradually when it exceeds the threshold, while a limiter says “you shall not pass” once the signal reaches that threshold.
It’s like the difference between keeping your audio signal on a leash (compressor) and shutting the gate entirely (limiter) so nothing gets beyond a set boundary.
This makes the compressor good for controlling unruly dynamics, and limiters good for squeezing as much dynamics as possible into a track without clipping.
They may be used to limit individual instruments or tracks during the mixing stage, or entire stereo mixes during the mastering stage. You can read more on how on applying the right limiter settings to your songs for the best results.
Features to look for in a mastering limiter
Some of the features that come with mastering limiters may not have much use in more general studio applications.
But given the unique requirements of audio mastering (Wiki article), features that can be superfluous–and even unnecessary–for mixing may be indispensable for mastering.
For instance, limiters employed in mixing typically have compression ratios of about 1:10. This is usually sufficient for individual instruments. But for mastering purposes, you want a limiter with precise output limiting and higher ratios than that which general-purpose compressors and limiters are able to provide.
Limiters with precise output level control and high ratios are often referred to as “brick wall” limiters.
Mastering limiters may also include additional tone shaping features, typically at the end of the signal path.
Common additions are soft saturation and/or soft clipping algorithms, which are useful for imparting warmth and extra harmonics reminiscent of the sound recorded ‘hot’ onto an analog tape.
How to choose a mastering limiter
One of the most common criteria for choosing a mastering limiter is transparency.
Because mastering limiters will be called upon to process the entire mix, you will want a unit that provides as little coloration as possible.
Perceivable distortion, shrillness, harshness, and pumping are all generally considered undesirable qualities in a mastering limiter…
… so you will want one that processes your audio according to your needs without imparting its own ‘color’ or tonal imprint, which is what a general purpose limiter, great of individual tracks, may do.
That being said, you also don’t want a mastering limiter that tames your mix to the point of lifelessness.
There is such a thing as too much of a good thing, and your effort to avoid harshness and excessive coloration could very well push your mix the other way. The result: a bland and forgettable mix with a distinct lack of punch or impact.
Now let’s take a look at the limiter plugins that you can use for mastering your tracks.
Best Mastering Limiter Plugin Software
Remember to take a look at the “Final Thoughts” section for the comparison and consensus on these plugins.
1. PSP Xenon
PSP Xenon is a full-band, dual-stage limiter with a great set of cutting-edge features great for crunching your tracks.
It employs a two–stage process for limiting signals, the first of which applies gain reduction while allowing transients to pass through. Once they get to the second stage, the transients are processed separately via look-ahead and envelope detectors.
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A ‘leveler’ control then applies gain reduction on louder passages before applying limiting, resulting in a rich and full sound without introducing distortion.
Specs and features
- Two–stage limiting process: First stage applies gain reduction while letting transients through. Second stage processes transients separately with look-ahead processing and envelope detectors
- Leveler control applies a gain reduction on louder passages before applying limiting
- Auto output mode lets you compare input/output signals while adjusting settings
- Easy-to-use interface.
- K–system loudness metering with pink-noise generator
User impressions
PSP Xenon is frequently praised for being clean and transparent, and its ability to preserve the most delicate elements of a mix. It is also lauded for its intuitive design, which shares many of the same features and functionalities as other PSP products.
Xenon is so transparent that it is frequently used in productions wherein maintaining the integrity of the source audio is of utmost priority, such as in jazz or classical music recordings.
Bottom-line
PSP Xenon has a serious combination of features and functionality that makes it a standout among the current crop of limiter plug-ins. We were especially impressed with the leveler and stereo unlink controls that allow the signal to be cranked without introducing distortion.
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The transient stage is also among the most flexible we’ve seen, enabling percussive elements to retain their punch. In terms of transparency, Xenon is pretty much the one to beat.
Demonstraton
2. FabFilter Pro-L
Fab-Filter’s Pro-L is perhaps the first choice that comes to mind of anyone looking for an innovative true peak limiter. It’s suitable for a wide variety of mastering and mixing applications. It has features like precision controls and an intuitive user interface, so the Pro-L manages to sound great regardless of the source material.
Set your VST Plug-ins path, and click 'Re-scan' or 'Clear cache/re-scan'. Audio Unit plug-ins (Mac Only) are scanned by default on launch. Reboot Reaper and your plug-ins will be re-scanned. Confirm you now have the plug-in correctly listed in your FX List. If the VST path in Reaper is correct, folder and file permissions are usually the culprit (I gave my user account full permissions to my VST folders). Reaper can blacklist plugins if they can't load upon first detection, and it may interrupt the new plugin scan altogether (especially since the Waveshell is technically one plugin). I'm using Komplete 11 via Reaper. Some of the plugins won't show up via the search in Reaper eg Form or Massive. I can access them in Komplete Kontrol but not the Reaper search or even when I search for the stand alone product on my PC. Vst plugin not showing up reaper free.
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Specs and features
- Precise true peak level meters
- Versatile loudness metering supports most common standards
- Real-time level display
- Advanced algorithms
- Linear-phase oversampling
- Professional dithering
- Noise shaping
- Surround support
- Intelligent channel linking
User impressions
I’ve seen the FabFilter Pro-L called a “game changer” in some parts of the internet. Some people consider the user interface “revolutionary,” and the metering feature is pretty much untouchable. “Intuitive” is a word that frequently comes up in reviews, with both pro and hobbyist users praising its unique algorithms and versatile controls as well.
Bottom-line
There are many reasons why the FabFilter Pro-L could deserve a spot on your mastering toolbox. It’s rich, loud, and totally satisfying, so it delivers good value in terms of sonic quality alone. The metering is also a great addition, providing much more effective average loudness readout than most other limiters.
That said, it may not be the most transparent limiter out there, but as a mastering plugin, it is sufficient. The Pro-L definitely packs a solid punch.
Demonstration
3. Sonnox Oxford Limiter v3
Sonnox Oxford Limiter is a peak limiter plug-in that will preserve the transients of your source material while maximizing volume and clarity. It delivers a good level of detail that few other brick wall limiters are able to provide, so it’s versatile enough for nuanced limiting as well as more creative limiting applications.
Now on version 3, Oxford Limiter uses a system of four processes: preprocessing gain control, program enhancement and overshoot control, reconstruction metering and compensation, and dithering and noise shaping.
Limiter 6 Plugin
Specs and features
- True peak limiting with attack, release, and variable soft knee
- Loudness maximization preserves transient details
- Recon meter shows actual signal instead of sampled signal
- Auto Comp fixes reconstruction errors without losing loudness
- Accurate side-chain processing
- Adaptive timing utilizes look-ahead
- Four noise shaping modes
User impressions
Most users rely on Sonnox Oxford Limiter to deliver its trademark transparent quality. But the plug-in has also won many users over for its ability to shape audio into more creative directions.
Regardless of approach, most users of Sonnox Oxford Limiter acknowledge its excellent sound and simple and straightforward, yet elegant performance.
Bottom-line
A great peak limiter in the classic style, Sonnox Oxford measures up admirably to most every limiter in this roundup. The enhance section adds a certain ‘exciter’-like quality to source audio that isn’t at all harsh or overbearing.
It definitely adds a welcome touch of intensity and loudness to any signal without introducing perceivable ‘pumping.’
Demonstration
4. Dynamics and Vintage Limiter (in iZotope Ozone 8)
Dynamics and Vintage Limiter are two modules in the popular mastering suite that everyone wants to get these days, iZotope’s Ozone. Now on version 8, Ozone has grab bag full of signal processing goodies mashed with an AI. The result is a package most every studio engineer or producer will find indispensable (or irresistible).
As for the limiters, Dynamics is basically a “frequency-conscious” dynamics module that enables the dialing out of harshness and other unwanted high-end artifacts. Vintage Limiter for its part is a compressor/limiter inspired by the legendary Fairchild 670 Compressor/Limiter with some modern features added. (You can learn more about the original hardware unit from this article).
Specs and features
Dynamics:
- Adaptive release mode intelligently automates release times
- Interactive threshold control sets threshold points for the limiter and compressor stages with.
- Learn mode for setting crossover frequencies automatically
- Mid/side processing mode
- Detection Filter with high-pass and tilt modes
- Advanced detection circuit modes
Vintage Limiter:
Vst Plugin Classic Master Limiter Download
- Inspired by the Fairchild 670 hardware limiter
- Character control allows fine tuning of response to suit source material
- Scrolling waveform display for visual feedback
- Backwards-compatible with “Tube” mode Maximizer presets in Ozone 6.1
User impressions
Most comments on the Dynamics and Vintage Limiter modules highlight how easy it is to use (even for beginners) as well as the top notch sound quality. Many producers also appreciate the ability to handle most any type of mixing and mastering projects with just these two tools.
Admittedly, the ease of use of these and the other modules in the Ozone package means that it is easy to go overboard and ruin your mix (raise your hand if you’re guilty of this). Nevertheless, the power and flexibility that these two provide are undeniable, and the other modules are simply the icing on the cake.
Bottom-line
Between the Dynamics and Vintage Limiter modules, you are packing enough firepower to get you through most every conceivable scenario. Covering a broad range of dynamics processing and mastering needs, these two are a great step up from the native dynamics suite that comes with your DAW. Also, if you’re new to mastering, the suite has the ability to do the work for you.
Perhaps the only thing we could say against the Dynamics and Vintage Limiter is that it is quite easy to go overboard and ‘overcook’ your mix with them if you aren’t careful. That, and the only way to get these limiters is if you buy the whole Ozone suite. Great suite to have as a “one stop mastering tool,” but may be much if all you want is a limiter plugin.
Demonstration
5. Waves L2
Waves L2 is an undeniably classic piece of software that has become something of an industry standard among peak limiting plug-ins. Also known as the “Ultramaximizer”, it has found a home in many producers’ mixing and mastering toolkits, due to its simplicity, straightforwardness, and reliable results.
Despite its seeming simplicity, L2 actually has some pretty sophisticated features under the hood, including look-ahead functionality, level maximization, and high-resolution capability. Nevertheless, it remains remarkably easy to use, and it is pretty much a studio essential regardless of your level of knowledge and expertise.
Specs and features
- Look-ahead brickwall peak limiting and level maximization
- Manual and Automatic Release Control (ARC)
- Increased Digital Resolution (IDR)
- Bit re-quantization and 9th-order dithering with noise-shaping filter
- Double-precision bit resolution processing
- Mono and Stereo components
Free Mastering Limiter Plugin
User impressions
The L2 has achieved quite a following over the years, with many users attesting to its simple and straightforward performance and its distinctive sonic character. True, the L2 may not be for everyone, but for every user that is turned off by its grungier and less pristine qualities, there are many more that find it an essential mixing and mastering tool.
Bottom-line
Limiter 6 Free Vst
Waves L2 is a classic for good reason. Even with so many limiter plug-ins having come and gone over the years, L2 remains a popular choice for its simplicity, boldness, and undeniably characterful tonal imprint.
Obviously, the L2 isn’t the cleanest and most transparent mastering limiter around. Even so, its quick and dirty operation and its unique tonal signature make it an indispensable part of any producer’s mastering toolbox. Simply put: you can always count on the L2 to deliver.
Demonstration
Final Thoughts
The truth is, you could very well handle most any type of limiting related task with any one of these plug-ins. Even the venerable Waves L2 is just as useful and practical now as it was when it was first released, and there is no reason why you still can’t use it in a modern production today.
That being said, FabFilter’s Pro-L and PSP’s Xenon are noticeable steps up from the L2–and indeed, from the rest of the pack. With their cutting-edge features, innovative functionalities, and unbeatable sound, the Pro-L and Xenon make’s really convincing just how much plug-in technology has advanced in the years.
We’d also have to give props to Sonnox Oxford Limiter and the Dynamics and Vintage Limiter modules in Ozone. The Vintage Limiter is an especially wonderful recreation of the classic Fairchild 670 limiter, and Sonnox Oxford’s offering is no slouch either.
But we have to make a decision and so we shall…
Vst Plugin Classic Master Limiter (vst)
Top choice: PSP Xenon
Between the top two contenders for mastering– FabFilter Pro-L and PSP Xenon–we would have to give the slight advantage to PSP Xenon.
Best Free Limiter Vst
Now, don’t get us wrong: the Pro-L is every bit a world-class limiter plug-in and we definitely would be happy to have it handle all our limiting tasks when mastering our tracks. Even so, the acoustic transparency of the Xenon and its ability to preserve the most detailed transients won us over in a big way.
Best Limiter Plugins
For our money, when it comes to mastering, Xenon is pretty much the pinnacle of software limiting technology when it comes to crunching out transparent and clean tracks.