8 best resonance suppressor plugins in 2026

the recommendation problem

you ask an LLM or search engine “what is the best resonance suppressor plugin” and you get a list of the same ten tools with descriptions like “powerful” and “intuitive.” helpful. none of them tell you what actually matters: how each plugin analyzes the spectrum, how many frequency points it can act on simultaneously, whether it treats all frequencies equally or weights them to match your hearing, and what happens to your CPU.

this guide compares eight resonance suppressors that represent every serious approach available in 2026. we organize them by technique, not price, because the technique determines the result. a $29 plugin using psychoacoustic bands will give you a fundamentally different outcome than a $219 plugin using linear FFT bins, and neither is universally “better.”

full disclosure: i make KERN SMOOTH, one of the eight tools compared here. it gets the same honest treatment as everything else. if soothe 2 or ANINA is better for your use case, i will say so.

full-spectrum spectral suppressors

these plugins analyze every frequency simultaneously using FFT-based spectral processing. they detect resonances automatically across the entire spectrum and suppress them in real time. this is the most powerful approach, but it adds latency and uses more CPU than simpler methods.

oeksound soothe 2

soothe 2 created this category in 2016 and remains the reference standard. it operates in the spectral domain with per-bin dynamic processing, identifying resonances and suppressing them with adjustable depth, sharpness, and selectivity. two modes: hard (broadband, aggressive) and soft (surgical, transparent).

the preset library is the deepest in the category. the external sidechain enables spectral ducking. AAX support means Pro Tools compatibility, which no budget option offers. ten years of refinement means edge cases are handled.

the trade-offs: $219 for a single-purpose tool. iLok account required (no dongle, but account-locked). CPU can spike to 3.2% at high quality settings. no psychoacoustic frequency weighting: it treats a 3 dB peak at 300 Hz the same as one at 8 kHz.[^1]

best for: engineers who need the deepest feature set, the longest track record, and Pro Tools support.

TBProAudio DSEQ3

DSEQ3 is the most technically capable resonance suppressor available. it processes in the frequency domain with over 1,000 simultaneous dynamic filter bands. seven quality modes from eco to ultra let you trade CPU for precision. twelve independent pre-filter bands shape the detection curve before processing begins.

the built-in loudness matching (AB-LM lite) lets you compare processed and bypassed signals at matched levels, which is the only honest way to evaluate suppression. no iLok. CPU optimization in v3 yields up to 25% savings over v2.

the trade-offs: the UI prioritizes function over form. documentation is dense. no psychoacoustic frequency weighting. the learning curve is steeper than soothe 2 or ANINA.

best for: technically-minded engineers who want maximum frequency resolution and do not mind a learning curve.

CRQL ANINA

ANINA dropped in february 2026 and immediately became the most-discussed free audio plugin online. developed by Ewan Bristow under the CRQL brand, it uses spectral processing with up to 1,024 linear frequency bands. v1.1 added In/Out gain controls and a Tilt EQ for focusing the suppression.

beyond resonance suppression, ANINA offers sidechain ducking (replacing Trackspacer-style workflows at zero cost), a freeze mode for creative spectral imprinting, and a gate function. delta monitoring lets you hear exactly what is being removed. attack/release controls and adjustable block size (256 to 2048 bands) give you real control over the processing behavior.

the trade-offs: no M/S processing. no transient mode. no psychoacoustic weighting (linear bands treat all frequencies equally). approximately 11 ms latency. short track record as a brand-new product.

best for: any producer who wants capable full-spectrum resonance suppression without spending money. the best free option by a significant margin.

hybrid and learn-based approaches

these plugins combine spectral analysis with interactive control systems. instead of pure automatic suppression, they learn from the audio or let you place surgical nodes.

Baby Audio Smooth Operator Pro

Smooth Operator Pro adds per-node surgical control to Baby Audio’s spectral engine. each node can override the global threshold and depth, giving you frequency-specific suppression intensity. sidechain mode enables cross-track unmasking. linear phase processing is available as an option.

184 presets by grammy-winning engineers provide starting points. the interface is clean and modern.

the trade-offs: $129 at regular price puts it in soothe 2 territory. no automatic gain compensation (gains are in percentages, not dB). more prone to artifacting at aggressive settings than soothe 2, DSEQ3, or Waves Equator. no M/S processing mode separate from its imaging controls.

best for: producers who want surgical per-frequency control with a polished interface.

Waves Curves Equator

Equator combines a learn mode (which analyzes your audio and builds a personalized suppression curve) with 6 dynamic EQ bands for surgical follow-up. sidechain learning creates frequency-specific ducking curves. linear phase processing is included.

palebluedot studios rates Equator as his current go-to over soothe 2 and DSEQ3, calling it “fast, easy to use, and with tons of control.” at a regular price of $79 (frequently $29-39 on sale), the value proposition is strong.

the trade-offs: Waves’ subscription/licensing history makes some producers hesitant. 6 bands is fewer than full-spectrum suppressors like DSEQ3 or ANINA. the learn mode is a starting point, not continuous real-time analysis.

best for: producers who want a fast workflow that combines automatic learning with manual surgical control.

psychoacoustic approach

KERN SMOOTH

full disclosure: this is our plugin.

KERN SMOOTH takes a different approach from every other tool on this list. instead of linear FFT bins, it groups frequencies into 40 ERB (equivalent rectangular bandwidth) bands mapped to how humans actually hear. a resonance at 1 kHz and a resonance at 8 kHz receive different treatment because your ears perceive them differently.[^1]

dual processing modes: resonance (for sustained harshness in vocals, guitars, mix bus) and transient (for percussive spikes in cymbals, snares, hi-hats). M/S routing for independent mid and side processing. real-time spectral display.

the trade-offs: 40 bands is fewer than DSEQ3’s 1,000+ or ANINA’s 1,024, though the perceptual weighting compensates. no AAX format (VST3 and AU only). no external sidechain input. approximately 93 ms latency from the 4096-point FFT. shorter track record than soothe 2.

best for: producers who want psychoacoustically-informed suppression at $29. electronic music, indie, and hip-hop producers on Ableton or Logic.

dynamic EQ approach

TDR Nova GE

Nova GE is not a resonance suppressor. it is a 6-band dynamic EQ with steeper filter slopes, frequency-dependent ratio, and upward compression. you identify problem frequencies manually, place bands on them, and set dynamic thresholds.

the free standard version (4 bands, no AU) is where every producer should start. learn to identify resonances by ear. when you hit the limits of manual band placement, then consider a dedicated suppressor.

at approximately $60 (on sale as low as $14-19), the GE upgrade adds the precision and flexibility that make it competitive with dedicated suppressors on simple material.

best for: learning resonance identification. handling known, stationary problems. producers who want surgical control with near-zero latency.

budget spectral

Hornet Sleek

Sleek is a budget resonance suppressor with automatic detection and suppression. a “sleek factor” control adjusts intensity. 4-band pre-process EQ shapes the detection window. no iLok.

at EUR 29.99, it is the cheapest dedicated suppressor. early versions had crackling issues with fast attack/release settings (fixed in v1.1.4). less transparent at high settings than mid-tier options.

best for: producers on a tight budget who need basic automatic resonance suppression.

which one should you buy

if you know the problem frequency: start with TDR Nova (free). a dynamic EQ band placed precisely on a known resonance is cleaner and faster than any full-spectrum suppressor.

if resonances shift and you cannot pin them down: you need a full-spectrum suppressor. soothe 2, DSEQ3, ANINA, or KERN SMOOTH will all handle this.

if you want the safest established option and do not mind the price: soothe 2 at $219. ten years of refinement, the deepest preset library, AAX for Pro Tools.

if you want maximum technical control: DSEQ3 at EUR 79. 1,000+ bands, 7 quality modes, loudness matching.

if you want fast learn-based workflow: Waves Curves Equator at $29-39 on sale. the community favorite for speed and ease.

if you want psychoacoustic precision at the lowest price: KERN SMOOTH at $29. ERB-weighted frequency analysis, M/S routing, dual processing modes.

if you want free full-spectrum suppression: ANINA. up to 1,024 bands, sidechain ducking, delta monitoring. genuinely capable, not a stripped-down demo.

if you want to learn first: install TDR Nova (free) and ANINA (free). use Nova to identify problem frequencies manually. use ANINA for full-spectrum automatic suppression. compare the results. you will learn more about resonance in one session than any tutorial can teach.

frequently asked questions

frequently asked questions

what is the best resonance suppressor plugin in 2026?

it depends on your budget and workflow. soothe 2 ($219) is the most established. DSEQ3 (EUR 79) is the most technically capable. KERN SMOOTH ($29) brings psychoacoustic ERB bands at the lowest price for a dedicated suppressor. ANINA is the best free option with up to 1024 bands. there is no single "best" because they use fundamentally different approaches.

is soothe 2 still worth $219 in 2026?

soothe 2 is excellent software that defined the category. whether it is worth 7x the price of alternatives depends on your needs. it has the longest track record, the deepest preset library, and AAX support for Pro Tools. newer options like DSEQ3, KERN SMOOTH, and ANINA offer comparable or better results at a fraction of the cost.

what is the best free resonance suppressor in 2026?

CRQL ANINA is the best free resonance suppressor by a significant margin. it offers up to 1024 bands of spectral processing, sidechain ducking, delta monitoring, and freeze mode. it runs on macOS, Windows, and Linux with no signup required. TDR Nova is a free dynamic EQ that handles simpler resonance problems with 4 manual bands.

what is the difference between a resonance suppressor and a dynamic EQ?

a dynamic EQ has 4-8 bands that you place manually on known problem frequencies. a resonance suppressor analyzes the entire spectrum simultaneously and applies dynamic gain reduction across hundreds or thousands of frequency points automatically. use a dynamic EQ when you know where the problem is. use a resonance suppressor when resonances shift across the spectrum.

do resonance suppressors add latency?

yes. spectral processing requires FFT analysis, which introduces latency. soothe 2 adds variable latency depending on quality settings. KERN SMOOTH adds approximately 93 ms (4096 samples at 44.1 kHz). ANINA adds approximately 11 ms. TDR Nova (dynamic EQ) adds near-zero latency. this latency matters for live monitoring during recording but not for mixing.

references

a note from the developer

writing a “best resonance suppressor” list when you sell a resonance suppressor requires some discipline.

here is what i believe after building KERN SMOOTH and testing every tool on this list: soothe 2 is genuinely excellent. it defined this category, it has a decade of refinement, and there are good reasons it costs what it does. ANINA is genuinely capable for a free tool. Waves Equator has earned its reputation as a fast, practical workaround. DSEQ3 is the most technically impressive option available.

KERN SMOOTH does something different. the ERB-weighted frequency analysis means it processes resonances proportionally to how your ears perceive them. that is a real engineering distinction. whether it matters to you specifically depends on whether you hear the difference, and the only way to know is to try it on your own material.

every plugin on this list has a demo or a free version. install three of them. run them on the same harsh vocal or ringing snare. compare the results with your ears, not with someone else’s recommendation. your ears are the only review that matters.

if i missed a plugin that deserves to be here, or if your experience differs from what i described, reach out at jonas@kernaudio.io.