Why this matters
An equalizer is the most fundamental tool for shaping how audio sounds. Whether you are tuning a pair of speakers, compensating for a room with too much bass, or trying to make a thin recording sound fuller, an EQ lets you adjust the volume of specific frequency ranges independently. Without it, you are stuck with the flat, unmodified signal that may not suit your playback environment, your hearing preferences, or the technical requirements of your project.
This five-band graphic equalizer covers the entire audible spectrum with bands at 60 Hz, 230 Hz, 910 Hz, 4 kHz, and 14 kHz. The 60 Hz band controls sub-bass rumble, 230 Hz handles bass and low-mid warmth, 910 Hz sits in the vocal midrange, 4 kHz governs presence and clarity, and 14 kHz controls air and brilliance at the top end. Each band offers 12 dB of boost or cut, which is enough range to dramatically reshape the tonal character of any signal passing through it.
The built-in 440 Hz sawtooth test tone is a practical addition because it lets you hear your EQ adjustments immediately without needing to load an external audio file. A sawtooth wave contains harmonics at every integer multiple of the fundamental frequency, so boosting or cutting any band produces an audible change. This makes the tool an effective learning environment for understanding what each frequency band actually sounds like, which is knowledge that transfers directly to mixing, mastering, and audio production work.
Reference table
| Band | Frequency Range | Typical Use |
|---|---|---|
| Band 1 | 60 Hz | Sub-bass control, reducing rumble or adding low-end weight |
| Band 2 | 230 Hz | Bass and low-mid warmth, tightening or filling the low end |
| Band 3 | 910 Hz | Midrange, where most vocal and instrument fundamentals sit |
| Band 4 | 4 kHz | Presence and clarity, making vocals and lead instruments cut through |
| Band 5 | 14 kHz | Air and brilliance, adding sparkle or reducing harshness at the top |
How to use it
Drag each frequency band slider up to boost or down to cut, with a range of -12 dB to +12 dB.
Click the Test tone button to hear a 440 Hz sawtooth wave processed through your current EQ settings.
Listen for changes in brightness, warmth, and fullness as you adjust each band.
Fine-tune each slider until the tone matches your preference or the requirements of your project.
Testing your result
Activate the test tone and set all sliders to zero to hear the unmodified sawtooth wave. Then adjust one band at a time while the tone plays, listening for the specific tonal change each band produces. Boost the 60 Hz band and notice the added low-end weight, then cut it and compare. Move through all five bands this way to build an intuitive understanding of what each frequency region sounds like. Once you are familiar with the individual bands, try combining adjustments, such as boosting the low end while cutting the high end, to hear how the overall character shifts.
Common mistakes
Boosting every band to maximum, which simply raises the overall volume without improving tonal balance.
Making extreme cuts or boosts that introduce unnatural-sounding artifacts into the signal.
Focusing only on bass and treble while ignoring the critical midrange band that carries most musical content.
Expecting the equalizer to fix fundamentally poor audio quality, when it can only shape what is already there.
Edge cases and options
The equalizer currently works with the built-in test tone and processes audio through the Web Audio API. This means all filtering happens in real time with no latency perceptible to the user. A sawtooth wave was chosen as the test signal precisely because its rich harmonic content spans all five bands, making every EQ adjustment audible. If you need to apply EQ to your own audio files, you would need to use a dedicated audio editor or DAW, but the frequency knowledge you gain here transfers directly to those professional tools.
Real-world use cases
Learning what each frequency band sounds like before mixing your first audio project.
Experimenting with EQ curves to find a signature sound for a podcast or livestream.
Demonstrating the effect of equalization in a classroom or workshop setting using the test tone.
Quickly checking whether your speakers or headphones reproduce low bass and high treble accurately by sweeping the bands.
Frequently asked questions
Q: Can I use this with my own audio files?
A: Currently the equalizer plays a test tone. For applying EQ to your own files, export from a DAW or use a dedicated audio editor.
Q: What do the frequency bands cover?
A: 60 Hz for sub-bass, 230 Hz for bass and low-mid, 910 Hz for midrange, 4 kHz for presence, and 14 kHz for air and treble. Together they span the audible spectrum.
Q: Why use a sawtooth wave as the test signal?
A: A sawtooth contains harmonics at every integer multiple of the fundamental, so it produces energy across all five EQ bands. This makes every slider adjustment audible and educational.
Q: How much boost or cut can I apply?
A: Each band supports -12 dB to +12 dB of gain, which is sufficient for both subtle tonal shaping and dramatic character changes.
Start using it now
Try the Equalizer tool. See also Volume Booster and Audio Normalizer and Audio Merger.
