Audio EQ

Node type: utility:audio_eq
Category: Editing

Description

Equalize a voice clip: a presence bell (cut harshness in the 2-5 kHz band), a de-esser (tames sibilance around 6-8 kHz, only while it is loud), and a low shelf (body). The default preset voice_deharsh is the fix for harsh TTS clones (Fish, ElevenLabs): -3.5 dB wide bell at 3.5 kHz, de-ess at 7 kHz, +1.5 dB shelf at 150 Hz. none starts every band off. Any dial you set overrides the preset for that one value; a band with gain 0 (de-ess amount 0) is off. When bands boost, the whole clip is first turned down by the sum of the boosts, so the EQ cannot push it past full scale; follow with a loudness node if level matters. Out-of-range values are refused with the number, never clamped. Sample rate and channels are kept. Free: deterministic processing, content-addressed output.

Canvas ports

These appear as port handles on the left side of the node.

ID	Label	Details
audio	Audio	AUDIO (required)

Sidebar config

These render as form fields in the right-side config panel when the node is selected.

ID	Label	Details
preset	Preset	TEXT · options: voice_deharsh, none
presenceGain	Presence gain (dB, -12 to 6; blank = preset)	NUMBER
presenceFreq	Presence frequency (Hz, 1000 to 8000)	NUMBER
presenceQ	Presence Q (0.3 to 4; lower = wider)	NUMBER
deessAmount	De-ess amount (0 to 1; 0 = off)	NUMBER
deessFreq	De-ess frequency (Hz, 4000 to 10000)	NUMBER
lowShelfGain	Low shelf gain (dB, -6 to 6)	NUMBER
lowShelfFreq	Low shelf frequency (Hz, 50 to 400)	NUMBER
format	Format	TEXT · options: mp3, wav

Outputs

ID	Label	Type
audio	EQ Audio	AUDIO

What it is for

TTS voice clones (Fish, ElevenLabs) often come out harsh: the 2-5 kHz band sits 7 to 10 dB under the low end, where a natural voice sits about 15 dB under, and the S sounds spit. Wire the voice into Audio EQ and the default preset fixes both without a trip to an audio editor.

The voice_deharsh preset

• Presence: -3.5 dB, a wide bell (Q 0.7) centred at 3.5 kHz.
• De-ess: a dynamic cut around 7 kHz that only engages while that band is loud, so it takes the edge off sibilants and leaves everything else alone.
• Low shelf: +1.5 dB at 150 Hz, a little body back.

Measured on real Fish clones, the preset moves the 2-5 kHz band 3 to 3.5 dB further under the low end and trims the 6-8 kHz sibilance band by 2 to 3 dB. Want more? Set Presence gain to -6.

Settings

Every dial starts blank, which means "use the preset's value". Set one and it overrides that value only. Pick the none preset to start from flat.

• Presence gain (dB, -12 to 6) and frequency (1000 to 8000 Hz), Q (0.3 to 4, lower is wider). Gain 0 (anything under 0.05 dB) turns the band off.
• De-ess amount (0 to 1; under 0.01 is off) and frequency (4000 to 10000 Hz).
• Low shelf gain (dB, -6 to 6) and frequency (50 to 400 Hz).
• Format: mp3 (default) or wav. Sample rate and channels are kept.

Every band off is refused rather than handing back a transcode. Out-of-range values are refused with the number, never clamped.

Headroom

When bands boost, the whole clip is first turned down by the SUM of the boosts, so a voice already normalized near full scale does not clip. The sum, because two boosts that overlap (a +6 shelf and a wide +6 bell) add up past either one. The preset boosts 1.5 dB, so its output is about 1.5 dB quieter at peak. Put Audio Master (or your loudness step) after it if the level matters.

Free, and why

Free set, no Run button, refreshes when anything downstream runs. The output is content-addressed by the input url and the settings, so an unchanged re-run reuses the last file.

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Auto-generated from the Wireflow node registry.