AHFSC
Adaptive High Frequency Spectral Control
An adaptive multiband de-esser and resonance controller. AHFSC learns the source, proposes up to four reduction bands — sibilance, harshness, nasality, boxiness — and cuts each one in the spectral domain, only when and where the problem appears. Drag bands directly on the display; every band has its own Amount, Harmonics and self-ducking Air.
Or get all six plugins in the Complete Bundle — €179 (save €136)
Automatic when you want it. Multiband when you need it.
Drop it in and AHFSC works like a smart one-knob de-esser — the engine learns the source and places the reduction itself. The moment a track needs more, press ANALYZE or double-click the display and it becomes a full multiband problem-solver. Same learned model, same window, no mode switch to hunt for.
Zero-setup de-essing
- The engine learns the source and places the reduction region itself (AUTO)
- One Amount slider; Tone Shift and Precision shape the character
- Reduction happens in the spectral domain, only when sibilance appears
Four problems, one plugin
- Up to 4 free-range bands — not fixed crossovers: place, resize and overlap them anywhere, drawn directly on the display
- ANALYZE proposes the layout; resonance mode cuts what classic de-essers protect as “tonal”
- Per-band Amount, Harmonics and self-ducking Air — cut, densify and brighten independently
One visual language across both
Audio Examples
Comparative demonstrations of processing applied to representative source material.
Technical Capabilities
Learns the voice: 3–5 second analysis builds a per-singer sibilance model
ARA integration — instant offline analysis of the whole region in ARA hosts
Adaptive tracking follows the sibilance focus in real time
Frequency-selective spectral reduction — the rest of the signal is untouched
Two engines: lookahead spectral for mixing, zero-latency for tracking and live
Enhance section rebuilds polished top end after de-essing (Air / Harmonics / Mix)
Delta monitoring — hear exactly what is being removed
Full automation support for all parameters
Learn, Divide, Conquer
AHFSC is built around a learned model of the specific voice on the track. One press of ANALYZE calibrates it in a few seconds — and in ARA hosts the entire region is analyzed offline, instantly. Reduction then happens in the spectral domain, only where sibilance actually lives, and a three-band Enhance section adds back polished top end once the harshness is gone.
Presence
Definition and closeness. Brings a de-essed vocal forward again without reintroducing edge (up to +6.5 dB).
Sheen
Polish and brightness in the classic top-end region — the shine that heavy de-essing usually costs you (up to +9 dB).
Silk
A true 40 kHz Air band, analog-matched so the rise never cramps at the top of the spectrum — the Maag/AirEQ character. At 88.2 kHz+ sessions it genuinely lifts beyond 20 kHz (up to +14 dB).
The Processing Chain
Analyze
One learning verb. A 3–5 second calibration builds a 64-point model of the voice's sibilance signature across 2–16 kHz; in ARA hosts the region is analyzed offline the moment you press it. A live-capture fallback keeps it working anywhere.
Adaptive Tracking
The detector follows the sibilance focus as it moves — different vowels, different mic distances, different phrases. The display shows the current focus frequency and gain reduction in real time.
Spectral Reduction
Gain reduction is applied per frequency inside each band, only when its problem appears. Every band has its own Amount; bands below 2.5 kHz run in resonance mode, cutting the sustained nasality classic de-essers protect as “tonal”. Tone Shift and Precision shape the whole engine's character.
Two Engines
A lookahead spectral engine for mixing quality, and a zero-latency engine for tracking and live use — switch per session, same learned model drives both.
Enhance
After reduction, the Air / Harmonics / Mix section rebuilds the top end with the three bands above — so the vocal ends up smooth and bright, not smooth and dull.
Monitoring
Delta plays only what is being removed — the fastest way to tune Amount honestly. Bypass gives an instant A/B.