Resonance suppression explained (for producers who just want clean vocals)

If you already know what resonance suppression is, skip ahead to the alternatives. If you're newer to mixing and wondering what all the fuss is about, this section is for you.

Resonance suppression is a type of audio processing that identifies and reduces harsh, ringing frequency peaks in your audio — automatically and in real time. Think of it as a smart assistant that listens to your track and says "that frequency is sticking out too much right now" and turns it down, then leaves it alone when it's behaving normally.

Here's why that matters more than a regular EQ:

• Static EQ is a permanent cut. If you find a harsh peak at 4 kHz and cut it with a regular EQ, that cut is always active — even during moments when 4 kHz sounds perfectly fine. The result? Your vocal loses brightness and energy even in the parts that didn't need fixing.
• Dynamic resonance suppression is surgical. It only reduces frequencies when they flare up. The rest of the time, your signal passes through untouched. Vocals stay bright and present. Guitars keep their body. Mixes retain their energy.

There are a few different approaches plugins use to achieve this:

• Spectral processing — analyzes the entire frequency spectrum using FFT (Fast Fourier Transform) and applies reduction across hundreds or thousands of frequency points. This is what Soothe 2 does. It's the most comprehensive approach but also the most CPU-hungry.
• Dynamic EQ — uses a set number of EQ bands (usually 4-6) that respond dynamically to the signal level at each frequency. More manual but gives you precise control. TDR Nova works this way.
• Resonance detection — identifies resonant peaks specifically (as opposed to analyzing the entire spectrum) and reduces them dynamically. Less CPU-intensive than full spectral processing while still being automatic. RysUpSmooth uses this approach.

All three approaches can give you cleaner vocals and smoother mixes. The differences come down to accuracy, CPU usage, how much manual setup is required, and — of course — how much they cost.

1. RysUpSmooth by Rys Up Audio — free resonance suppressor

Full transparency: this is our plugin. We built RysUpSmooth because we were tired of the same conversation every producer has — "I need resonance suppression but I'm not paying $199 for it." So we made one that's free. No trial, no watermark, no limitations. Just a resonance suppressor you can download and use forever.

What it does: RysUpSmooth uses real-time resonance detection to identify harsh, problematic frequency peaks in your audio and dynamically suppress them. When resonances flare up, it reduces them. When they're not present, it leaves your signal alone. Same core concept as Soothe 2 — automatic, adaptive resonance control — without the spectral overhead or the price tag.

How it compares to Soothe 2: RysUpSmooth is not a Soothe 2 clone. It uses resonance detection rather than full-spectrum FFT analysis, which means it's lighter on CPU but less granular on extremely dense material. For vocals, guitars, synths, and mix buses, the results are genuinely close. On complex mastering chains with 50+ tracks summed together, Soothe 2's deeper spectral resolution has an edge.

Pros

• 100% free. No trial period, no feature limits, no subscription. Download it and it's yours.
• Simple interface. Three main controls — sensitivity, depth, and speed. Load it up and get usable results in 30 seconds.
• Low CPU usage. Lightweight enough to run on multiple tracks simultaneously without your DAW choking.
• VST3 and AU support. Works in FL Studio, Ableton, Logic, Pro Tools, Studio One, Cubase, Reaper — any major DAW.
• Real-time dynamic processing. Not a static EQ hack — it genuinely detects and responds to resonances as they happen.

Cons

• No spectral display (you can't visualize exactly what's being reduced like you can with Soothe 2).
• No mid/side processing mode.
• Less granular control than Soothe 2 or DSEQ3 — by design, for simplicity, but power users may want more parameters.

CPU usage: Low. Comfortable on multiple tracks in a typical session. Significantly lighter than Soothe 2 or DSEQ3.

Best use case: Vocal mixing, cleaning up acoustic instruments, smoothing out harsh recordings, mix bus treatment. The sweet spot for bedroom producers and semi-pros who want resonance suppression without complexity or cost.

Download RysUpSmooth free from our Plugin Installer Hub.

2. TDR Nova by Tokyo Dawn Records — free dynamic EQ

TDR Nova is one of the most respected free plugins in the entire audio production space, and for good reason. It's a parallel dynamic EQ with four fully configurable bands, plus high-pass and low-pass filter sections. If you know what frequencies are causing problems, TDR Nova lets you set up dynamic bands that only reduce those frequencies when they cross a threshold you define.

What it does: Each of Nova's four bands can operate as a standard EQ or as a dynamic EQ with its own threshold, ratio, attack, and release. You identify a resonant frequency, set the band to cut dynamically, and the plugin only reduces that frequency when it gets too loud. It also includes a background frequency analyzer so you can see what's happening in your signal.

How it compares to Soothe 2: TDR Nova is a manual tool. Soothe 2 automatically detects resonances across the entire spectrum. With Nova, you're doing the detective work yourself — finding problem frequencies, setting up bands, dialing in thresholds. It's more hands-on but gives you precise control over exactly what gets processed. The quality of the processing itself is excellent.

Pros

• Completely free. The standard version gives you everything you need for targeted resonance work.
• Outstanding sound quality. Tokyo Dawn's processing algorithms are genuinely top-tier for a free plugin.
• Four dynamic EQ bands. Enough for targeted resonance reduction on most material.
• Built-in frequency analyzer. Helps you identify problem areas visually.
• Very low CPU usage. Runs efficiently even on older hardware.
• VST, VST3, AU, and AAX support. Works everywhere.

Cons

• Not automatic — you have to find and target resonances manually.
• Only four dynamic bands in the free version (six in the Gentleman's Edition at ~$50).
• Steep learning curve for beginners who don't know which frequencies to target.
• Can't handle broadband resonance problems the way spectral processors can.

CPU usage: Very low. One of the most efficient dynamic EQs available.

Best use case: Producers who have ear training and know their frequencies. If you can identify that your vocal has a nasty resonance at 3.2 kHz, Nova will handle it beautifully. If you just want to throw a plugin on and have it figure things out for you, this isn't the move.

3. Smooth Operator by Baby Audio — spectral processing (paid, with trial)

Baby Audio's Smooth Operator is probably the most direct competitor to Soothe 2 in terms of approach. It uses spectral processing to analyze and reduce resonances, and it does it through a visual, node-based interface that makes it easy to see and control what's happening. Baby Audio recently released the Pro version with per-node dynamic processing, stereo/mid-side support, and a significantly upgraded engine.

What it does: Smooth Operator analyzes your audio's spectral content and applies dynamic correction across the frequency spectrum. You shape a target curve by placing nodes, and the plugin smooths your audio's spectral balance to match. The Pro version adds individual dynamic processing profiles for each node, giving you much more surgical control than the original.

How it compares to Soothe 2: The original Smooth Operator was simpler and more "set it and forget it" than Soothe 2. The Pro version closes the gap significantly with per-node controls and mid/side processing. Sonically, both produce transparent results. Soothe 2 still has deeper spectral resolution and a more mature algorithm, but Smooth Operator Pro hits different in terms of workflow speed and visual feedback.

Pros

• Excellent spectral processing quality. Transparent, musical results on vocals and instruments.
• Beautiful visual interface. The node-based EQ curve makes it intuitive to shape your target response.
• Pro version adds serious depth. Per-node dynamics, mid/side processing, and sidechaining.
• Loads of factory presets. 184 presets created by industry engineers get you started fast.

Cons

• Not free. The original is ~$39, Smooth Operator Pro is $129 (on sale for $79 through March 2026). Trial available but limited.
• Moderate CPU usage — heavier than a dynamic EQ, lighter than Soothe 2.
• The original version lacks the per-node dynamic controls that make the Pro version competitive with Soothe 2.

CPU usage: Moderate. Comparable to DSEQ3. You can run a few instances comfortably but it's not as light as TDR Nova or RysUpSmooth.

Best use case: Producers who want visual spectral control and don't mind paying for it. If you're looking for a paid Soothe 2 alternative that's cheaper and potentially faster to use, Smooth Operator Pro is worth the trial.

4. DSEQ3 by TBProAudio — dynamic spectral EQ (demo available)

DSEQ3 is the plugin that audio engineers on forums and Reddit always recommend when someone asks about Soothe 2 alternatives. And honestly? It deserves the reputation. DSEQ stands for "dynamic spectral EQ," and it works almost identically to Soothe 2 in concept — self-adjusting frequency bands that detect and reduce harshness across the entire spectrum automatically.

What it does: DSEQ3 uses self-adjusting bands across the full frequency spectrum to identify and suppress resonances dynamically. It includes a gain-reduction spectrograph so you can visualize exactly what's being processed, adaptive slope and threshold controls for "autopilot" mode, and a natural phase dynamic filter option that reduces pre-ringing artifacts.

How it compares to Soothe 2: DSEQ3 is the closest thing to Soothe 2 in terms of approach and depth. Both use spectral analysis with self-adjusting bands. Some engineers actually prefer DSEQ3 for its more surgical per-band control and its gain-reduction spectrograph. Soothe 2 generally edges out on processing transparency — especially on dense material — but the gap is smaller than you'd expect given the price difference.

Pros

• Very close to Soothe 2's approach. Full spectral processing with self-adjusting bands.
• Gain-reduction spectrograph. See exactly what's being reduced in real time.
• Adaptive threshold/slope. "Autopilot" mode that requires minimal user tweaking.
• Natural phase filter option. Reduces pre-ringing for more transparent results.
• Demo available. Full functionality with periodic audio muting — lets you evaluate before buying.

Cons

• Not truly free. The demo mutes audio every 90 seconds. Full version is ~$79 (EUR 79).
• Interface can feel overwhelming for beginners — lots of parameters and spectral data on screen.
• Moderate-to-heavy CPU usage, especially with the spectrograph active.
• Windows and macOS only (no Linux).

CPU usage: Moderate to heavy. Similar to Soothe 2. Running it on many tracks simultaneously will tax your system.

Best use case: Engineers who want Soothe 2-level spectral processing at less than half the price and don't mind a more complex interface. If you already understand spectral EQ concepts and want deep control, DSEQ3 is a serious contender. The demo lets you decide before spending anything.

5. Oeksound Soothe 2 — the $199 original

No Soothe 2 alternatives list is complete without talking about the original. We're including it here for an honest comparison because if you're evaluating your options, you should know exactly what the $199 gets you that the free and budget alternatives don't.

What it does: Soothe 2 is the original dynamic resonance suppressor. It uses high-resolution spectral processing to analyze your audio across the entire frequency range (down to 20 Hz), identify resonant peaks, and reduce them dynamically. It offers soft and hard processing modes, per-band depth control, attack and release shaping, mid/side processing, sidechain input, and a spectral delta display that shows you exactly what's being removed from the signal.

What makes it special: Nearly a decade of algorithm development since the original Soothe in 2017. Oeksound has refined the processing to be exceptionally transparent — even aggressive settings sound natural. The soft mode preserves transients better than almost any competitor, and the spectral resolution on complex material is still the benchmark.

Pros

• Best-in-class algorithm. The most refined and transparent resonance suppression available.
• Deep spectral resolution. Handles extremely complex material (full mixes, orchestral arrangements) better than any alternative.
• Advanced features. Mid/side processing, sidechain input, per-band control, spectral delta display.
• Soft and hard modes. Flexible processing that adapts to different material and use cases.
• Industry standard. Used on major label releases worldwide. Trusted by top engineers.

Cons

• $199. That's the big one. For a single plugin that does one thing, it's a significant investment.
• Moderate to high CPU usage, especially at higher quality settings.
• The interface, while powerful, has a learning curve.
• 20-day trial only — no free version, no lite edition.

CPU usage: Moderate to high. One of the heavier plugins in its category, especially when using the higher quality offline settings.

Best use case: Professional mixing and mastering studios where the marginal quality improvement over free alternatives justifies the cost. Major label projects. Engineers working on extremely dense, complex productions where every fraction of a dB of transparency matters.

Resonance suppressor comparison table

Here's every option side by side, compared on the specs that actually matter when you're choosing a resonance suppressor or free dynamic EQ for vocals:

The takeaway is pretty clear. For the two truly free options, RysUpSmooth gives you automatic resonance detection while TDR Nova gives you manual dynamic EQ control. If you're willing to spend money, DSEQ3 at ~$79 gets you closest to Soothe 2's capabilities. And Soothe 2 itself remains the benchmark — but at $199, you're paying a premium for that last 10% of refinement.

When should you actually buy Soothe 2?

Real talk. We're not going to pretend Soothe 2 doesn't deserve its reputation. It does. But there's a massive gap between "this plugin is excellent" and "this plugin is worth $199 for your specific situation." Here's an honest breakdown of when spending the money makes sense and when it doesn't.

Soothe 2 is probably worth it if:

• You're a professional mixing or mastering engineer billing clients. If resonance suppression is a daily tool in your workflow and clients are paying you for results, $199 is a business expense. The transparency and refinement of Soothe 2's algorithm on complex material is genuinely hard to replicate with free tools. It pays for itself in a session or two.
• You work on extremely dense productions. Orchestral arrangements, heavily layered pop productions, EDM masters with 80+ tracks — this is where Soothe 2's deep spectral resolution pulls ahead of alternatives. The algorithm handles harmonic complexity better than anything else available.
• You need mid/side processing and sidechain input. If you're doing advanced mastering work where you need to process mid and side signals independently, or you need to key the resonance detection from an external source, Soothe 2 is one of the few tools that offers this natively.
• You've tried the free alternatives and genuinely hit their limits. This is the most honest test. Use RysUpSmooth, TDR Nova, or the DSEQ3 demo for a month. If you consistently find yourself wishing for more control, more transparency, or better performance on your specific material, then Soothe 2 might fill that gap.

Save your money if:

• You're a bedroom producer or independent artist. For mixing vocals in your home studio, cleaning up acoustic recordings, and polishing beats, the free alternatives handle it. No cap. The difference between RysUpSmooth and Soothe 2 on a bedroom vocal recording is negligible — and the room acoustics, mic quality, and performance are going to have 10x more impact on the final sound than your choice of resonance suppressor.
• You're still learning to mix. If you're developing your ear and workflow, spending $199 on a specialized tool before you've mastered the basics (gain staging, EQ, compression) is putting the cart before the horse. Get comfortable with a free tool first — and pair it with free vocal presets to hear how resonance suppression fits into a complete chain. You'll know when and if you need more.
• You only need resonance suppression occasionally. If you reach for a resonance suppressor once every few sessions, $199 is a lot for a sometimes-tool. A free option covers those occasional needs perfectly.
• Your budget is better spent elsewhere. If $199 is a significant portion of your plugin budget, that money will make a bigger difference invested in a good pair of headphones, acoustic treatment panels, or a microphone upgrade. Improve the source, and you'll need less post-processing of any kind.

The audio industry has a habit of convincing producers they need the most expensive version of everything. You don't. Use what works. If a free resonance suppressor gets the job done on your mixes — and for most producers it will — bank that $199 and put it toward something that actually moves the needle.

How to remove harsh frequencies from vocals (step by step)

Whether you choose RysUpSmooth, Soothe 2, or any other resonance suppressor on this list, the workflow for taming harsh vocals is basically the same. Here's how to do it properly:

1. Start with a clean signal chain. If you're unsure about signal chain order, our how to mix vocals guide covers the full workflow. High-pass filter first (around 80-100 Hz for most vocals) to remove rumble and low-end buildup. This keeps your resonance suppressor focused on the frequencies that actually matter.
2. Place the resonance suppressor before compression. This is important. If harsh resonances hit your compressor first, the compressor will react to them and create pumping artifacts. Clean up the resonances, then compress.
3. Start with conservative settings. With RysUpSmooth, start with sensitivity around 40-50%, depth around 30-40%, and speed at a medium setting. With Soothe 2 or DSEQ3, use the default preset as a starting point. With TDR Nova, set up 2-3 dynamic bands in the 2-8 kHz range with gentle ratios.
4. A/B compare constantly. Toggle the plugin bypass on and off. The processed version should sound smoother and less fatiguing, but it should not sound dull, thin, or lifeless. If it does, you're overcooking it — dial back.
5. Trust your ears over the meters. Resonance suppression is about feel. If the vocal sounds smoother and more comfortable to listen to at louder volumes, you're in the right zone. Don't chase numbers on a display.

Bonus tip: Pair your resonance suppressor with the right vocal presets to get professional results fast. Our presets are designed to work alongside tools like RysUpSmooth — the preset handles the creative EQ and compression, the resonance suppressor handles the cleanup. Together, they get you 90% of the way to a polished vocal in minutes. Grab a free vocal preset and try it out.

FAQ: Free Soothe 2 alternatives