What it is
An exciter (or harmonic enhancer) generates new harmonics from a band of the signal, usually the upper part, and mixes them in small amounts with the original. Unlike an EQ, which can only raise what already exists, the exciter creates content where there is none: a vocal recorded with a dark microphone, a low-resolution sample, a bass that cannot be heard on phones can gain definition.
The first commercial device was the Aphex Aural Exciter (1970s): it filtered the signal with a high-pass, distorted it in a controlled way and added a small part of it to the clean signal. Today there are multiband exciters (iZotope Ozone Exciter, FabFilter Saturn 2, Softube Harmonics), bass enhancers (Waves MaxxBass, RBass, Renaissance Bass) and psychoacoustic enhancers.
Types
- Harmonic high-frequency exciter: HP on the side branch (2–8 kHz), saturation, blend at 5–20%. It adds brightness and “air” without the hiss of an EQ boost.
- Multiband exciter: each band has its own saturation (tape, tube, triode, warm, retro) and its own amount. It allows, for example, even harmonics on the mids and odd harmonics on the highs.
- Bass enhancer (psychoacoustic): generates the harmonics (2nd, 3rd, 4th) of a low fundamental. The ear reconstructs the fundamental even when the speaker does not reproduce it (missing fundamental). It makes 808s, subs and kicks audible on phones and laptops.
- Phase / dynamic enhancer (BBE style): delays some bands relative to others and dynamically expands them to make attacks sharper.
Parameters
- Starting frequency (HP of the excited branch): where the generation starts. Vocal 3–6 kHz, cymbals 6–10 kHz, guitars 2–4 kHz, bass 600 Hz–1.5 kHz (for definition), bass enhancer 40–120 Hz (fundamental to generate from).
- Drive / Amount: how much saturation. Start at 10–30%.
- Mix / Blend: share of excited signal. 5–20% on tracks, 5–10% on buses, 2–8% in mastering.
- Mode / character: tape (soft, low odd harmonics), tube/triode (even harmonics, warm), warm, retro (rawer).
- Oversampling: enable it (2×–8×): generating harmonics above 10 kHz creates aliasing without oversampling.
Starting settings
| Source | Band | Character | Mix |
|---|
| Dark vocal or recorded with a dynamic mic | 4–8 kHz | Tube/triode | 10–20% |
| Already bright pop vocal | 10–14 kHz | Tape | 5–10% |
| Acoustic guitar | 3–8 kHz | Tape | 10–15% |
| Snare and drum bus | 3–6 kHz | Retro or tube | 10–20% |
| Electric bass (definition) | 700 Hz–2 kHz | Tube | 15–25% |
| 808 and sub (listening on phones) | Bass enhancer from 50–80 Hz | 2nd–3rd harmonics | enough for the note to be heard on a small speaker |
| Pads and dark samples | 6–12 kHz | Tape | 10–20% |
| Master | 8–16 kHz | Tape/warm | 2–8% |
Exciter or EQ?
- An EQ boost at 10 kHz also raises the hiss and the sibilance already present.
- An exciter adds harmonics correlated with the music: more definition, less hiss. But it also adds distortion: in excessive amounts it makes the sound harsh and tiring.
- Rule: if the information in the highs exists but is weak, use EQ; if it does not exist (dark source, filtered sample), use an exciter.
In FL Studio
There is no dedicated exciter among the stock plugins: you build one with Patcher (a branch with Fruity Parametric EQ 2 as an HP at 4 kHz → Fruity Blood Overdrive or Fruity Waveshaper → low level, summed with the clean branch) or with a send to a mixer track with HP + saturation. Dedicated plugins: Ozone Exciter, Saturn 2, Waves Vitamin, Aphex Vintage Aural Exciter, Softube Harmonics.
Common mistakes
- An exciter on many tracks at once: the sum of high harmonics makes the mix harsh and fatiguing, especially at high volume.
- Exciter before the de-esser on a vocal: the sibilance gets exaggerated and becomes hard to control.
- A pushed bass enhancer: the bass turns “buzzy” at 150–300 Hz and covers the male voice.
- No comparison at matched volume: the exciter raises perceived loudness and always gives the impression of sounding better.
- Oversampling off: metallic aliasing above 10 kHz.
Starting settings
| Parameter | Value | Why |
|---|
| Mix on a track | 5–20% | Definition without harshness. |
| Mix in mastering | 2–8% | Air without fatigue. |
| HP of the excited branch (vocal) | 3–6 kHz | Harmonics only in the presence zone. |
| Drive | 10–30% | Controlled harmonics. |
| Oversampling | 2×–8× | Avoids aliasing in the highs. |
| Order on the vocal | After the de-esser | The sibilance is not exaggerated. |
Frequencies to watch
| Range | What to do |
|---|
| 50–120 Hz | Fundamental from which the bass enhancer generates harmonics for small speakers. |
| 150–400 Hz | Zone where the bass enhancer's harmonics end up: check that it does not become mud. |
| 700 Hz–2 kHz | Definition of the electric bass and the 808 in the mix. |
| 3–8 kHz | Presence and definition of vocals, acoustic guitar, snare. |
| 8–16 kHz | Air and brilliance: low mix, tape character. |
Example chain
| Step | Tool | Settings | Why |
|---|
| Corrective EQ | Fruity Parametric EQ 2 | HP, cuts | Cleanup before generating harmonics. |
| Compression | Track compressor | 3–6 dB | Stable level: the exciter reacts consistently. |
| De-esser | Dedicated de-esser | 5–9 kHz | Sibilance already under control. |
| Exciter | Ozone Exciter / Saturn 2 / Patcher with Blood Overdrive | Band 4–8 kHz, mix 10–15% | Definition. |
| Color EQ | EQ | Fine corrections | Balances the result. |
How to check the result
- Air band (8–16 kHz): relative energy must not rise by more than 2–3 dB after the exciter on a single track, 1 dB on the master.
- Presence band (4–8 kHz): compare before/after; if it rises together with the sibilance peaks, move the exciter after the de-esser.
- High-bass (120–250 Hz) and Low-mid (250–500 Hz) bands with a bass enhancer: no more than 1–2 dB of increase.
- Integrated loudness of the track in comparison: compensate the output so that the difference is under 0.5 LU before judging.