What Is Frequency in Audio? Hz Range for Mix & Vocal
Learn what frequency (Hz) means in audio and how to read the Hz range for mixing and vocal recording, with practical EQ checks.
Understanding frequency is the most basic step in audio: once you can read the Hz range, EQ decisions for mixing and vocal recording get much easier.
1. The human hearing range (and what matters for vocals)
Most people can hear roughly 20 Hz to 20 kHz. For vocals, the most important areas usually sit in the mid and high-mid zones—where clarity, body, and intelligibility are formed.
2. Common Hz ranges and what they sound like
| Frequency range | What you’ll usually hear |
|---|---|
| 20–80 Hz | Sub bass, foundation/weight |
| 80–250 Hz | Thickness, warmth |
| 250 Hz–2 kHz | Vocal body, basic clarity |
| 2–5 kHz | Presence, “words coming through” |
| 5–12 kHz | Brightness, air |
3. Use frequency ranges to diagnose vocal problems
Here’s a quick way to think during vocal mixing. Don’t guess—check the range first.
- If your vocal sounds muddy: check 200–400 Hz.
- If your vocal lacks word clarity: check 2–4 kHz.
- If your vocal feels harsh or has noticeable sibilance: check 5–8 kHz.
4. Beginner-friendly EQ tips (so you don’t make it worse)
- Cut problems before you boost. If there’s mud or harshness, fixing that first usually sounds more natural than adding “more” elsewhere.
- Use a moderate Q. Avoid extremely narrow cuts/boosts at first. Narrow moves can create unnatural tone changes.
- A/B before vs after. Switch back and forth so you don’t fall into “it sounds normal now” bias.
5. FAQ
Does boosting high frequencies always make vocals better?
No. Too much high-end can increase harshness and make your ears fatigue faster.
Is EQ preset enough for a vocal?
Presets are just a starting point. Every voice and every arrangement needs its own adjustments.
What should I check first if my vocal sounds unclear?
Start with the 2–4 kHz area for intelligibility, then revisit 250 Hz–2 kHz if the overall tone still feels off.
How do I know if I’m boosting the wrong range?
If the vocal gets brighter but also harsher or less natural, you’re likely boosting an area that should be controlled (often 5–8 kHz for sibilance).
Send a rough vocal take to 2lab to get quick EQ guidance based on the Hz ranges that need attention next.
