The IQ-Series Limiter is, hands down, the most transparent yet powerful limiter I’ve ever used — nothing else comes close.
Daniel Wehr
Tutor at Berklee College of Music
Composer, Producer, Music Sound Designer
IQ-Series Limiter V2
Next generation true peak mastering limiter
The HOFA IQ-Series Limiter V2 is the mastering limiter that allows you to achieve maximum transparency even when going for high loudness. It can also be used effectively as a sound design tool to add more punch, saturation and musical pumping.
- Maximum transparency. Maximum loudness. Maximum sound.
- Six algorithms: Transparent, Hard, Electronic, Fast, Med, Slow
- XY pad to enhance the sound with harmonics and musical pumping
- Complete control with real-time visualization of signal changes and detailed LUFS metering
- Developed in one of Germany's most renowned studios
6 outstanding algorithms
The name says it all: in Transparent mode, the limiter works almost inaudibly and prevents distortion efficiently. This mode is ideal for all genres in which natural sound is more important than maximum loudness.
Hard mode, on the other hand, was developed for maximum loudness. It makes transients sound very direct, and harmonics intensify the sound in any way you like – perfect for heavy genres.
Bass-heavy music needs its own mode. The IQ-Series Limiter V2 offers the Electronic mode especially for this. With low-frequency audio, it delivers a particularly powerful sound without interfering artifacts.
You can also choose from the award-winning Fast, Med and Slow algorithms from the previous version. This means that the limiter is fully downward compatible.
Innovative user interface
Shape the limiter’s sound by simply using the XY pad, without worrying about countless technical parameters.
Moving on one axis, you can change the sound more towards clipping. Adding more harmonics results in a squarer visualization.
The other axis softens the sound and modifies it towards “musical pumping”. Here, too, the visualization in the background provides you with visual control.
By combining the two parameters in the XY pad, you can quickly achieve the optimal setting for your production – from perfectly transparent to extremely heavy or somewhere in between.
Precise metering
An informative metering section lets you always keep an eye on the loudness. You can see the level reduction, output level, loudness, loudness range and true peak. Clicking on these values resets the displays.
The time chart shows you many of the values in the timeline. This allows you to see exactly how the limiter is processing the signal.
Channel link
Use the channel link slider to specify how much the channels influence each other. The default setting is 100%, which means that the left and right channels are always processed simultaneously. This ensures a stable stereo image but can cost some loudness. At 0 %, the channels are processed completely independently of each other.
Additional features
The DC cut removes frequencies below 5 Hz to filter inaudible signal components and create more headroom for limiting. The phase shift up into the bass range can colour the sound and increase the loudness.
Depending on the playback device, intersample peaks can lead to unwanted distortion. Activating the True Peak function helps to avoid this.
Dither adds a low-level noise to avoid quantization errors when exporting at lower bit rates. For this purpose, the limiter should be the last link in your mastering chain.
Oversampling reduces aliasing effects by processing the audio signal at higher sampling rates. Values between 2x and 8x are recommended to keep the CPU load in check.
FAQ
What is the HOFA IQ-Series Limiter V2?
The HOFA IQ-Series Limiter V2 is a professional true-peak mastering limiter from HOFA-Plugins. It is an audio plugin designed for mastering and mixing that uses six different algorithms to ensure maximum transparency even at high loudness levels. The plugin features an innovative XY pad for intuitive sound shaping, high-precision LUFS metering, and a time chart for real-time analysis of signal processing.
What is the purpose of the IQ Limiter V2?
The IQ-Limiter V2 has a clearly defined task: to achieve maximum loudness without audible artifacts – and it can do this in two different ways, depending on the nature of your production.
Option 1: Absolute transparency
When it is about getting a song as loud as possible without any audible limiting, the IQ-Limiter V2 delivers exactly that. Its intelligent algorithms—particularly the Transparent Mode and Electronic Mode – have been optimized to actively prevent distortion, pumping effects, and intersample peaks. The result: your music matches the loudness of modern production standards while retaining its dynamics, punch, and sonic integrity. Features like 32x oversampling, true peak limiting, and DC cut additionally prevent unwanted side effects.
Option 2: Creative Sound Design with the XY pad
Not every production needs the most discreet limiting possible. Modern pop, rock, and electronic productions often benefit from the character a limiter adds to the master – from the direct punch of transients to the musical pumping of electronic tracks. This is exactly where the XY pad comes into play with the Transparent and Hard algorithms: Use the Clip parameter (for harmonics, saturation, and impact) and the Pump parameter (for smooth dynamic modulation and musical breathing) to transform the limiter from a mere loudness booster into an active sound design tool. You decide whether you want completely transparent limiting or to consciously add character to your production – with no complicated technical parameters.
In this way, the IQ-Limiter V2 covers both ends of the scale: from an invisible mastering tool to a creative effects plugin – and often even on different buses within the same production.
For whom is the IQ Limiter V2 recommended?
The HOFA IQ-Limiter V2 is suited for both beginners and professional audio engineers. Beginners benefit from numerous presets and the intuitive user interface, whilst more experienced users can apply the six algorithms, the XY pad and the detailed metering functions to achieve their specific mastering goals. The plugin is suitable for a wide range of genres – from classical music and pop/rock to electronic and bass-heavy music.
What makes the IQ Limiter V2 stand out from other limiters?
The HOFA IQ-Series Limiter V2 offers three unique features that set it apart from all other mastering limiters:
- Sound shaping with a two-dimensional XY pad
Instead of fiddling with dozens of technical parameters such as attack, release, knee or threshold, you shape the limiter’s sound using an intuitive XY pad with two musical parameters:
- Clip (Y-axis): adds harmonics and saturation – the sound becomes more aggressive and prominent
- Pump (X-axis): alters the sound towards a ‘musical pumping’ effect – softer, more dynamic, more lively
Within the algorithm, the character can be shaped seamlessly – from completely transparent limiting to an extremely aggressive sound, with every intermediate stage available at the touch of a button. This approach is unique in the world of mastering limiters.2. Live-Visualisierung der Klangveränderung in Echtzeit
- Real-time visualisation of signal changes
While typical limiters only let you hear the effect, the IQ-Limiter V2 also visualises the changes: More clip means more edgy and jagged visuals in the background of the XY pad – a direct indication of additional harmonics. More pump results in wider gaps between the circles that graphically represent the dynamic processing.
- Developed in one of Germany’s most renowned recording studios
The IQ-Limiter V2 was not designed on a drawing board but developed as part of everyday work at the HOFA-Studios in Karlsdorf – one of the leading recording studios in Germany with decades of experience. The algorithms are built directly based on professional studio practice and tested on real productions.
More highlights:
- Six algorithms in one plugin: Transparent, Hard, Electronic, plus the legacy modes Fast, Med and Slow – suitable for use across all genres
- Full backward compatibility: As the original algorithms are still included, older projects created with the IQ-Limiter V1 will sound identical
- Comprehensive documentation, including a manual, tutorials and support
- Excellent value for money compared to other professional mastering limiters in this class
What is true-peak limiting?
True-peak limiting means that so-called intersample peaks are also dealt with. These are level peaks that occur between digital samples and can cause distortion when converting the signal from digital to analog. The IQ Limiter V2 is a genuine true-peak limiter and actively prevents such intersample peaks by activating the true-peak function.
How does the XY Pad work?
The XY Pad is one of the most innovative features of the IQ Limiter V2 and is available in Hard and Transparent modes. It combines two parameters:
- Y-axis (CLIP): Adds harmonics and shifts the sound towards clipping for more punch and presence
- X-axis (PUMP): Shifts the sound towards a ‘musical pump’ for a softer, more dynamic character
The combination of both parameters allows you to shape the sound intuitively – from perfectly transparent to extremely aggressive.
What are the metering options in the limiter?
The IQ Limiter V2 features comprehensive metering in accordance with EBU R 128:
- Short Term LUFS – loudness measurement at short intervals
- Integrated LUFS – loudness of the overall signal
- Loudness Range (LRA) – dynamic range
- True Peak – true level peaks including intersample peaks
- Time Chart – visual representation of input, output, gain reduction and short-term loudness in a timeline
What is a DC cut and why is it useful in limiting?
A DC cut function removes extremely low frequencies that are inaudible but reduce headroom. The phase shift in the bass range can colour the sound and increase its loudness. When you activate the DC cut on the IQ-Series Limiter V2, it is set at 5 Hz.
Does it have a sidechain input?
Yes, the IQ-Limiter V2 features an external sidechain input. This allows you to use an external signal to control the limiter – useful for creative mixing effects or specific processing of dynamics.
Which mode for which genre?
| Genre | Recommended mode |
|---|---|
| Classical music, jazz, acoustic music | Transparent |
| Pop, rock | Hard |
| Metal, Hard rock | Hard with Clip |
| EDM, techno, trance | Electronic or Hard |
| Hip-hop, bass music | Electronic |
| Ambient, chillout | Transparent or Slow |
What can you do with the Channel Link feature?
The Channel Link function controls the extent to which the left and right channels influence each other:
- 100% (default): Both channels are processed simultaneously – consistent stereo image, the mono centre is always perceived exactly in the middle of the panorama
- 0%: Channels are processed independently of each other – maximum loudness
- Intermediate values: proportional effect
For surround productions, stereo pairs (L/R, LS/RS) are coupled; at values above 100%, they are also linked to the centre channel.
How do you use the limiter in mastering?
- Insert the IQ Limiter V2 as the last plugin in your mastering chain
- Select a suitable mode depending on the genre
- Adjust the input gain to achieve the desired loudness
- Enable True Peak to avoid intersample peaks
- Keep an eye on the LUFS values in line with your vision for loudness and dynamics
- Use dithering when exporting to lower bit rates (e.g. 16-bit for CD)
Feedbacks
“Choosing the HOFA IQ-Series Limiter V2 gives you a limiter that meets every possible requirement.”
“The XY pad offers unprecedented options that make it stand out from other limiters.”
“[…] Highly recommended for both entry-level and advanced producers”
Test rating: Top of the range – Excellent
+ Six different algorithms
+ Can be used universally
+ Clear layout of the interface
+ XY pad for individual settings
+ Limiter and metering tool in one
+ Many useful presets for beginners
Delamar – magazine for musicians
“Whether transparent limiting or maximum loudness is required, the IQ-Series Limiter V2 delivers very impressive results.”
“[…] an excellent tool for the final polish, allowing you to reach your desired target quickly”
“IQ-Series Limiter V2 impresses with its intuitive operation and enormous versatility”
“The different modes allow precise adjustment to a wide variety of musical styles”
Rating: 6 out of 6 points
BEAT magazine
Read the full article ›
„The new art of limiting”
“Guaranteed maximum loudness”
“IQ-Series Limiter V2 helps mixes achieve the necessary loudness in a very transparent way”
“The IQ-Series Limiter V2 retains the top spot […] and tops it all off with the ability to control clipping and pumping”
“… apart from the excellent basic sound, there are also sound design options […] that are addictive”
Test rating:
Top class – Excellent
+ Crystal clear, vibrant and transparent basic sound
+ XY Pad for distinctive sound shaping
+ Dynamically scalable interface
+ New professional metering tools integrated
Professional audio magazine
“With the IQ-Series Limiter V2, HOFA-Plugins has developed a true-peak limiter that achieves excellent results in mastering and mixing.”
“… an all-rounder whose versatility makes it suitable for any genre.”
“Seamless workflow guaranteed.”
„The IQ-Series Limiter V2 allows you to create the perfect master.”
Awarded “BEST PRODUCT” in the test:
+ Easy to use
+ Innovative features such as XY Pad and Time Chart
+ Excellent sound
KEYS & Recording magazine
Formats: VST3, AU, AAX
Operating System: macOS 10.13 or later, Windows 10 or later
HOFA plugins are continuously tested on the following DAWs:
Ableton Live, Apple Logic, Avid Pro Tools, Bitwig, Cockos Reaper, Image Line FL Studio, Magix Samplitude/Sequoia, Presonus Studio One, Steinberg Cubase/Nuendo/Wavelab
You have two licenses available. These are managed via the HOFA Plugins Manager, where they can also be deactivated and transferred to other computers.
It is also possible to activate and use HOFA plugins offline. Licenses on USB sticks can be used alongside USB licenses from other plugin manufacturers without any issues.
You can read the detailed manual here:
You will find helpful answers to many questions in our support center:
You can also reach us on weekdays at plugins@hofa.de and +49 7251 3472-444
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