OP-AMP EQ · FOUR BANDS, TWO TRANSFORMERS

P422 FAIRUZ

Two pieces of console history in one EQ, pushed further than the hardware ever went.

Every band runs through a discrete op-amp stage in the lineage of the API 2520. Push it and it gives back density and harmonic weight; switch the band off and the stage stays in circuit as pure color. The Contour shapes boost and cut the same frequency in one move, VOICE drives the input transformer, the Hammer drives the output one, and TREMOR feeds the whole chain from below. Zero latency, on macOS, Windows and iOS.

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AU, VST3, AAX, iOS Zero latency
P422 Fairuz: the graphite panel between two turquoise stones, with VOICE, MIX, OUT and TRIM, the four bands HIGH, HI-MID, LO-MID and LOW with their glowing gain sliders, TREMOR and the two shelves

Sculpting, not boosting.

Fairuz does not emulate a piece of hardware. Every frequency point, every gain step and every curve was chosen by ear to make an instrument sound more like itself.

Four bands, LOW to HIGH, each with three shapes: a proportional-Q bell, Contour and Contour X2. Contour is the old two-filter trick, a boost with a complementary dip around it, built into one band and tuned separately for each region, so a 3 kHz boost behaves differently from an 80 Hz one. Frequencies come stepped, at points picked for where instruments actually live, or continuous when you are chasing a resonance. The shelves work the same way: the LO SHELF adds weight and clears the low mids above it, the HI SHELF adds air and cushions the presence below it.

Switch a band off and its op-amp stage stays in the circuit. The gain slider then biases the harmonic character around that frequency instead of drawing a curve: green glow for EQ, red glow for color. VOICE drives the input transformer, the Hammer drives the output one, with OUT setting the drive and TRIM bringing the level back so you judge the change honestly. TREMOR adds infrasonic weight that excites the bands above it, and MIX blends the whole result against the dry signal.

THE BANDS AND THEIR RANGES
LOW20 to 400 Hz
LO-MID70 Hz to 1 kHz
HI-MID800 Hz to 11.5 kHz
HIGH2.5 to 18 kHz
LO SHELF20 Hz to 5 kHz
HI SHELF60 Hz to 18 kHz
CONTOUR · CONTOUR X2
A boost with its complementary dip, in one band; Contour X2 goes deeper. Above 6 dB the curves open up instead of cramping, so a bold move stays focused and the mix stays uncongested.
BAND SATURATION
Band off, op-amp on. The gain slider biases the stage toward color above the dot and toward a cleaner, hi-fi state below it, down to the minimum at -12 dB. No curve is drawn.
VOICE · HAMMER
VOICE sets how hard the input transformer is driven, from relaxed and deep to forward and firm. The Hammer is the output transformer: OUT drives it, TRIM compensates. Push-pull, starve or drive both, three ways to stage the same EQ.
TREMOR · MIX
TREMOR sits first in the chain and adds infrasonic energy that the bands above it feel. MIX blends the processed signal with the dry one without extra routing, and the visualizer keeps showing the processed path.

From the pros.

1 / 2
Pablo Governatori

“Fairuz isn't an EQ. It's a sound sculptor. The 3D depth it adds to the midrange is what separates a common plugin from a mastering-grade tool.”

Pablo Governatori
Multi-Grammy and Latin Grammy winning mixing and recording engineer
Rubén Blades · Juanes · Joan Manuel Serrat
Brian Vibberts

“I instantly loved the sound. It sounds very analog to me, without the analog hiss. With a smooth low end and a clean high end, it's everything you want in an EQ.”

Brian Vibberts
Seven-time Grammy Award winner, producer and engineer

What owners say.

5.0
★★★★★
Based on 27 reviews
5
96%
4
4%
3
0%
2
0%
1
0%
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HE
HIROKAZU ENDO
August 19, 2026
★★★★★

P422はとても素晴らしいEQです。特性を知れば知るほど驚きを与えてくれます。オペアンプの存在はP422の中核を担うと言ってもいいでしょう。魔法のようにアナログサウンドへ導きます。温かみと明瞭感そしてパンチのある見事な音です。もはやプラグインの域を超えてます。そしてバンドをバイパスしたときのクリーンでハイファイな音はP422の特徴のひとつでしょう。Pulsar Modular得意のサチュレーションで輪郭とエッジを与え倍音豊かなサウンドに変身します。私の使ってきたプラグインの中では最強と言えるでしょう。

YH
Yuta Hatanaka
Verified Owner
July 3, 2026
★★★★★

P422 Fairuz is a very interesting and inspiring plugin.

Although it is an EQ, I have been using it more as a way to give expression, shape, and character to the master rather than simply correcting frequencies. What I like about it is how naturally it seems to become part of the sound. It does not feel like an obvious layer of processing placed on top of the mix. Instead, it subtly makes the master feel as if it had always been meant to sound that way.

There is a sense of shade, depth, and contrast that appears almost effortlessly. The sound image becomes more confident, more sculpted, and more charismatic, but without becoming exaggerated or artificial. It adds a kind of handsome dimensionality to the master — subtle, but definitely present.

I have only spent a short time with it so far, but I already find myself drawn to it. When I bypass P422 Fairuz, the unprocessed version can suddenly feel flatter and more ordinary, as if something important in the expression of the music has disappeared. That is usually the sign of a plugin that is doing something truly musical.

I am still exploring what it can do, but I can already tell that this is not just another EQ. It feels like a tone-shaping instrument for the master bus, capable of adding personality, contour, and emotional weight while still preserving the natural identity of the track.

I have a feeling P422 Fairuz may become one of those plugins I reach for again and again.

HH
Henrik Hjortnaes
Verified Owner
May 15, 2026
★★★★★

Beautiful Fairuz is loaded with functionality, yet the thing that immediately grabbed my attention was its resonant EQ. Smooth, musical, and genuinely lovely to work with.

TH
Tommi Hartikainen
Verified Owner
October 13, 2025
★★★★

A great alternative resonant EQ! Combining transformer and voice controls with spectrum sweeping for pleasant—or ear-fatigue-inducing—frequencies often yields excellent results. I now often reach for Fairuz when traditional EQ or dynamic EQ just doesn’t do the trick. I also have a soft spot for the optional stepped controls, which is a classy addition!

R
RL
Verified Owner
September 20, 2025
★★★★★

Maybe add a horizontal version of the GUI? Otherwise - great!

MO
Matt Olsen
Verified Owner
September 17, 2025
★★★★★

What if PM made a 'character' EQ that could be many characters? As with it's older, wiser brother, the P440 Sweet Spot, the secret is in the unusual but carefully shaped curves and high and low pass filters. Unlike the P440 you have less fine grained control over every nuance, and less of a zoomed out mastering level perspective. With the Fairuz you get the curated options you get, let go of some control and are rewarded by workflow and using your ears. Trident A range users will be at home with the concept. The Fairuz can go from extreme to subtle but thrives when pushed in unusual ways, in unexpected combinations. Curve and parameter wise, there's nothing here the P440 can't also do (qualifier: each does "have a sound" and the saturation options are not quite the same), so there's a case for saving your coins. But even if you ultimately want both, the Fairuz often gets the nod on instrument level tracks. So, what about those many characters? The "voice" knob is key. Add it for some built in saturation. Remove if you want the creative workflow of those PM eq curves, while putting your own saturator or preamp plugin of choice before it. Sure, you could painstakingly recreate any curve using FabFilter or it's many imitators. And sure there's also a million and one "character EQ"s out there where you get what you get, but choose for the color. The value proposition of the Fairuz and what makes it unique is that it is something in-between: characterful curves with a slight mind of their own, that could have a color, any color, or none at all. Unlike many "character eq's" that trade on nostalgia, this sounds modern and it sounds great.

Lastly: a short mention of the presets. They're excellent. So many presets just offer the same redundant options ("drums" "more drums" ...) As if the only music ever to exist was made of drums and guitars. And you didn't have your own go-to moves for kick drum memorized. Presets should be for those things you don't always already have dialed in, but when they come up, dang it's handy to have a preset! The Fairuz has presets for cello (multiples of them!) as well as "bowed group" "plucked" various shadings of vocal options, piano, and even "lute/oud" If you mix classical, scores/soundtracks, world, folk, jazz this EQ is for you. But also it's fresh to try something left field on synth pads or that odd percussion element you can't get a handle on, having these options is refreshing and worth your time.

EP
Eduardo Poplawsky
Verified Owner
September 16, 2025
★★★★★

Very nice equalizer, with the PM magic. In addition to high, high mids, low mids and lows, you can use high pass and low pass filters, high and low shelves, tremor for frequencies around 30 Hz and below, blend with the dry signal and add a touch of color. Simple and effective eq. when surgical work is not needed.

W
Walter
Verified Owner
September 13, 2025
★★★★★

I love the voice knob. Nice for enhancement.

T
TAIGA
Verified Owner
September 12, 2025
★★★★★

High shelf is very sweet

ML
Mike Lawetto
Verified Owner
September 11, 2025
★★★★★

P422 Fairuz EQ
I’m always on the hunt for color EQs that are truly vibrant, packed with features, and easy on the CPU. Surprisingly, there aren’t many that check all those boxes. So when I discovered Fairuz, it was an instant buy.
Fairuz does it all—it can be pristine and transparent, or richly colored when you need that extra character. It offers features you won’t find in other EQs, and its efficiency is remarkable. One standout for me is how well it performs as a mastering EQ, which is a real testament to its design and quality.
Simply put: this is an EQ you can use on everything.

HA
Han Allred
Verified Owner
September 10, 2025
★★★★★

Another hit by PM.

JS
Jerry Svensson
Verified Owner
July 1, 2025
★★★★★

This EQ is highly versatile, and the saturation sounds excellent to my ears.
I especially appreciate the ability to bypass the EQ section while still using the saturation—such a useful feature.
Since the EQ curves can be quite unconventional, the addition of graphical displays was a very welcome update. It really helps you understand how each band is shaping the sound.

Y
Yukinocomic
Verified Owner
December 31, 2024
★★★★★

エミュレート元が無いPulsar modularオリジナルのトラックEQです。
中央のノブが周波数、ノブ右横のカーブスライダーがゲインになっています。
ゲインスライダーのステップ入力ランプを消すと、周波数を細かく設定できます。P450やP915より自由な点です。
P422はVOICEノブが特徴的で、一通り各周波数のゲインのし終えてから、VOICEノブを右に回すか左に回すかで、全体の印象を固くするか柔らかくするかを調整することが出来ます。再び各周波数のゲインを触ることなく音色を変えられるのがとても良いです。

JF
Jerome Fernandez
Verified Owner
December 27, 2024
★★★★★

What I like:
* It has a smooth, pleasing character that enhances the overall sonic quality without sounding harsh or artificial.
* The push/pull ear-tuned stepped frequencies are excellent. 
How I use it:
* Vocals: I find the Fairuz particularly effective on vocals. It adds a pleasant warmth and presence, making them sit well in the mix. The EQ is gentle and musical, allowing for subtle tonal shaping.
* Acoustic guitar: It can enhance the natural warmth and body of acoustic guitar recordings. A touch of saturation can add a nice vintage vibe.
* Electric guitar: It works well for adding warmth and subtle grit to electric guitar tracks, especially for cleaner tones or bluesy overdrive.
* Bass: The Fairuz can also add some warmth and subtle harmonic richness to bass lines.

JH
justin hoyuela
Verified Owner
December 25, 2024
★★★★★

Perfect EQ to use if your looking for the feeling of an Analog console, you can use it to confidently boost frequencies and still sound natural and organic.

EB
Ephraim Berkowitz
Verified Owner
October 10, 2024
★★★★★

This EQ helps me across my whole mix - from the little touch ups to greater EQ shaping, it always sound soo 'right' to my ears.
This EQ is unbelievable!

MS
Michael Seaton
Verified Owner
October 10, 2024
★★★★★

I really love the sounds this EQ can produce. it is a gemstone!
The power of an Infinity Stone on any Track & Song the P422 Fairuz!  
It is Top Quality & Sounds & Feels like Alchemy!

PM
Paul Macdonald
Verified Owner
September 22, 2024
★★★★★

One of the best EQ plug ins available, can be surgical and musical. I thought I was over buying EQs until I tried this one. its truly special.

DO
David OFarrell
Verified Owner
September 13, 2024
★★★★★

P422 is a terrific tool to have in the arsenal.
It excels on acoustic sources, as you can sculpt or enhance them without warping the spirit of their sound. The hammer circuit adds a very unique, almost mysterious flavor. It is subtle but it has this lovely grit and a helpful tightening effect. I really like pushing the midrange into it.

NK
Nick Kramer
Verified Owner
August 12, 2024
★★★★★

This EQ is truly extraordinary. Its combination of warm musicality and subtlety captures the magic of Pultecs in a totally parametric design. This really is one of those IQs where you con't realize how much better it makes things sound until you bypass and reengage it. And I say "things" because it works on everything! Pulsar Modular makes the best plugins I've heard and this is at least tied for the best. I don't know how this EQ came to pass but I love everything about it.

RB
Ronald Butler
Verified Owner
June 30, 2024
★★★★★

Another great tool from Ziad that allows me to get inside the mix and sculpt to achieve the sounds I hear in my head. Love it.

JK
Justin K.
Verified Owner
June 30, 2024
★★★★★

Love using this EQ for Vocals and everything else to bring out the best possible sound of what I'm working with. Using this with other PM plugins I couldn't ask for more. Just try it out yourself and see. Great work.

H
Han
Verified Owner
June 29, 2024
★★★★★

In my experience, PM plugins live up to the hype. The P422 deserves all the praise I’ve read on gearspace. It’s good, really good. I’ve used it everyday since becoming a day one early leaper and it’s been a joy to work with.

CV
Craig Voelker
Verified Owner
May 22, 2024
★★★★★

This is the only EQ I can remember that makes everything sound more "real" and more solid. Yes, other EQs make things sound good but on guitar or bass, P422 reminds me of having my ears down by the speaker; naked but better. A 9 dB of gain isn't harsh or even too much. Everything seems closer. If the sound you want is rude and raucous, this makes it stunningly more so. Amazing!

KK
KENNETH KINYERA
Verified Owner
May 18, 2024
★★★★★

This EQ is really incredible. My favourite EQ from Pulsar Modular or any manufacturer for additive. I am pairing this with MDW-eq6, but if I had to only choose 1 EQ as my only one, it would be this EQ.

Congrats Ziad, I thought I was set with the P450, but I feel more connected to the P422.

IT
illicit tsuboi
Verified Owner
May 16, 2024
★★★★★

great! great! great!
This is one of the easiest to use and musically superior EQs you've ever made.
In particular, LOW & HIGH SHELF works very well.

B
BSA
Verified Owner
May 16, 2024
★★★★★

A very welcome addition to the Pulsar Modular toolkit. Can't wait to have the final version with the final GUI!

Downloads.

P422 installer · v2.1.0
macOS ZIP
Windows ZIP
User guide · v2.1.0
English DARKPRINT
German DARKPRINT
Japanese DARKPRINT
Quick guide

Hover any control to learn what it does: every parameter, with visual references and detailed explanations.

iOS · AUv3 AND STANDALONE

Fairuz on iPhone and iPad

The same plugin, rebuilt for iOS. The QR code takes your phone straight to the App Store page.

Open in App Store
Opens the App Store
VERSION HISTORY
v2.1.0
August 21, 2026
  • EQ engine: improved HIGH and HI-MID accuracy and consistency across sample rates
  • TREMOR: smoother, more organic analog movement
  • Engine: performance and CPU optimizations
  • Stability: improved overall stability across DAWs and standalone
  • Presets: improved preset browser, saving and compatibility
  • Visualizer: improved preset recall, performance and display quality
  • Window: improved resizing and multi-monitor support
  • Workflow: improved keyboard focus, undo and redo, automation and UI behavior
  • Licensing: improved license activation and demo handling
v2.0.4
May 14, 2026
  • Optimized CPU performance for lower system load on dense sessions
  • Optimized spectrum visualizer for a smoother frame rate
v2.0.0
April 8, 2026
  • Redesigned GUI with an expanded spectrum visualizer
  • 278 presets, organized by instrument and application, from individual tracks to the mix bus
  • Op-amp circuit refined for deeper analog character and improved stereo imaging
  • HPF revoiced at 20 and 30 Hz for a smoother, more musical low end
  • Oversampling rebuilt from the ground up for truer transient preservation
  • Contour and Contour X2 curves recalibrated above 6 dB: deeper boost and cut, no cramping at high gain
  • Dual Mono mode: L/R randomization for true stereo hardware behavior on buses and groups
v1.6.4
March 26, 2025
  • Frequency analyzer IN and OUT can be selected individually for display
v1.5.9
March 7, 2025
  • Fixed GUI resizing when opening and closing the visualizer, and during session recall
v1.5.3
February 7, 2025
  • Frequency spectrum analyzer
  • EQ bands visualizer
  • Additional presets, code optimization and GUI update
v1.0.7
September 17, 2024
  • Knobs use smoothing for rapid automation without artifacts
v1.0.3
July 13, 2024
  • Modifier keys to bypass parameters for a quick A/B
  • German and Japanese user guides added
v1.0.0
June 27, 2024
  • Official release

The technical bits.

FORMATS
AU, VST3 and AAX on macOS, Apple Silicon and Intel in one universal binary. VST3 and AAX on Windows, x64. AUv3 and a standalone app on iOS 15 or later.
SYSTEM
macOS 10.13 or newer, Windows 10 or newer. 2 GB RAM, a display of 1440 × 900 or 1280 × 960 or larger.
BANDS
LOW 20 Hz to 400 Hz, LO-MID 70 Hz to 1 kHz, HI-MID 800 Hz to 11.5 kHz, HIGH 2.5 kHz to 18 kHz. Bell, Contour or Contour X2 per band, ±12 dB, stepped or continuous frequency, band off for saturation mode.
SHELVES
LO SHELF 20 Hz to 5 kHz and HI SHELF 60 Hz to 18 kHz, each with a complementary dip on the far side of its corner.
FILTERS
12 dB per octave. HPF 20 Hz to 400 Hz with a resonant peak riding the cutoff, LPF 800 Hz to 20 kHz, HPF before or after the output stage.
TRANSFORMERS
VOICE input transformer, -100 to +100. Hammer output transformer with OUT as the drive and TRIM OUT as the compensation.
TREMOR · MIX
Infrasonic TREMOR ahead of the bands. MIX for parallel processing, force mono, dual mono with L/R randomization, polarity, A/B with copy.
METERING
Peak or RMS input and output. Spectrum visualizer with the EQ curve and IN/OUT overlays. 278 presets.
LATENCY
Zero. Oversampling at 88.2 kHz and below for the Hammer and for hot high-band settings.
LICENSE
One-time challenge and response, up to 2 machines. Demo: thirty days, fully functional, on two computers.

Thirty days on two computers.

Fully functional, no credit card needed. Start the demo, complete the checkout and your authorization code arrives by email.

Already tried Fairuz and ran out of time? Email us through the support page and we will reset your trial.