Audio Equalizer Online — Adjust Frequencies Free
Last updated: 2026-03-09
Your podcast recording sounds muddy. Your music track has too much bass. Your voice memo has a tinny quality. An equalizer lets you boost or cut specific frequency ranges to fix these problems.
Frequency Bands Explained
| Band | Frequency | What It Controls | Common Adjustments |
|---|---|---|---|
| Sub-bass | 20-60 Hz | Rumble, vibration | Cut to remove room noise |
| Bass | 60-250 Hz | Warmth, body | Boost for thin recordings |
| Low-mid | 250-500 Hz | Fullness, muddiness | Cut to reduce muddiness |
| Mid | 500-2k Hz | Presence, clarity | Boost for vocal clarity |
| Upper-mid | 2k-4k Hz | Edge, definition | Boost for speech intelligibility |
| Presence | 4k-6k Hz | Brightness, detail | Boost for crisp vocals |
| Brilliance | 6k-20k Hz | Air, sparkle | Cut to reduce harshness |
Quick Presets
- Voice clarity: Cut 200-400 Hz, boost 2-4 kHz
- Bass boost: Boost 60-120 Hz by 3-6 dB
- Remove muddiness: Cut 200-500 Hz by 3-4 dB
- Podcast: High-pass at 80 Hz, slight boost at 3 kHz
Equalize your audio — 10-band EQ, free, instant.
Open Audio Equalizer →Related Tools
Audio Equalizer — Adjust frequencies
Noise Remover — Clean audio
Volume Normalizer — Fix volume
Audio Trimmer — Cut clips
Audio Converter — Change format
Speed Changer — Adjust tempo
According to Sound On Sound, subtractive EQ (cutting problem frequencies) generally produces better results than additive EQ.
As iZotope recommends, always EQ with purpose — identify the problem frequency first, then adjust.