Audio Frequency Chart – Complete Guide

An audio frequency chart is a reference guide that maps frequencies (measured in hertz) across the audible spectrum, typically from 20 Hz to 20,000 Hz (20 kHz). The chart often includes corresponding musical notes, instrument frequency ranges, vocal ranges, and other reference points. It’s a visual and numerical tool that translates between abstract frequencies and musical/practical contexts.

Think of it like a ruler for sound. When you need to know “what frequency is middle C?” or “where does a bass guitar’s range sit?” or “what frequencies does a soprano voice produce?”—a frequency chart is the reference you check. Audio engineers, musicians, producers, and acousticians use frequency charts constantly for tuning, mixing, analysis, and troubleshooting.

Frequency charts vary in detail. Some focus on musical notes and instrument ranges. Others include frequency response data for specific microphones, speakers, or room acoustics. Some are organized by frequency bands (lows, mids, highs). The best charts are those that match your specific need—mixing, tuning, hearing assessment, or acoustic design.

How audio frequency charts are organized

Most charts organize frequencies linearly (left to right from low to high) or in octaves. Musical notes follow a geometric progression (each octave doubles the frequency), so some charts show octaves stacked to reflect this relationship.

Typical organization includes columns for: frequency in Hz, corresponding musical note (with octave number), note name, and any additional data (instrument range, audible range, frequency band label).

Some charts use color coding: red for low frequencies, green for mids, blue for highs. Others use descriptive labels: “sub-bass” for frequencies below 60 Hz, “bass” for 60–250 Hz, “low-mids” for 250–500 Hz, and so on. These divisions are approximate but useful for practical audio work.

Detailed charts mapping musical note frequencies show every note across multiple octaves. Simpler reference charts just show key reference frequencies (A4 = 440 Hz, middle C = 261.63 Hz, etc.) and let you extrapolate from there.

Frequency ranges for human hearing and common instruments

Human hearing spans roughly 20 Hz to 20,000 Hz. Frequencies below 20 Hz (infrasound) are felt as vibration, not heard as sound. Frequencies above 20 kHz (ultrasound) are completely inaudible to humans.

Within the audible range, human hearing is most sensitive to frequencies between 2,000 and 5,000 Hz—the range where human speech and music live. Very low frequencies (below 100 Hz) and very high frequencies (above 10,000 Hz) require higher volume levels to sound equally loud.

Instrument frequency ranges vary widely:

• Kick drum: typically 40–100 Hz
• Bass guitar: 40–400 Hz
• Male voice: 85–180 Hz
• Female voice: 165–255 Hz
• Guitar: 82–1,000+ Hz (depending on fret)
• Piano: 27.5 Hz (A0) to 4,186 Hz (C8)
• Cymbals and high percussion: 5,000–15,000 Hz

Knowing these ranges helps in mixing and EQ work. If a vocal sounds muddy, boosting somewhere in the 200–400 Hz range won’t help (that’s bass guitar territory). Adding presence might require lifting around 2–4 kHz, where vocals sit.

Using a frequency chart for mixing and EQ

An audio frequency chart is invaluable when EQing. Instead of guessing (“this drum kit needs more sparkle”), you use the chart to identify where “sparkle” lives (typically 3–10 kHz depending on the instrument). You then adjust EQ at that frequency range.

If a vocal is boomy, the boom might be 150–300 Hz buildup. A frequency chart reminds you that this range overlaps with where bass guitar lives, so reducing the vocal’s low-mids avoids step-on-toes mixing issues. If an acoustic guitar sounds dull, a frequency chart shows that acoustic guitars have presence peaks around 2–4 kHz and 8–12 kHz—lift there and the guitar comes alive.

Frequency charts also help identify problematic resonances or hums. An electrical hum is typically 50 Hz or 60 Hz (depending on whether you’re in 50 Hz or 60 Hz power territory). Room modes—frequencies that ring longer in a space due to acoustic properties—often sit at specific frequencies related to room dimensions. A frequency chart helps you visualize these and plan accordingly.

Using a frequency chart for tuning

Tuning instruments relies on frequency references. A frequency chart shows you the target frequency for each string on a guitar (E2 = 82.4 Hz, A2 = 110 Hz, etc.), each key on a piano, or each note a vocalist aims for.

If you’re tuning an instrument and your tuner displays frequency in hertz, a frequency chart tells you whether you’re in the ballpark. A tuner showing 82 Hz means you’re close to the low E string (target 82.4 Hz). A tuner showing 110 Hz means you’re on the A string.

Some tuning methods rely on listening to beat frequencies—two slightly out-of-tune notes create a wobble that slows as you get closer. A frequency chart helps you understand what beat rate to expect at different frequency separations.

Interactive vs. static frequency charts

Static charts—PDFs, images, tables—are always available and don’t require software. Downside: you can’t drill down into specific ranges or adjust the view.

Interactive charts (web-based or app-based) let you zoom into frequency ranges, play tones at specific frequencies, compare frequency ranges side-by-side, and sometimes adjust the display based on your needs. Some interactive charts let you hear examples at different frequencies, which helps you develop an intuitive sense of where frequencies live.

A comprehensive sound frequency chart combines visual reference with audio examples, creating a more complete learning resource than a static chart alone.

Frequently Asked Questions

Do I need to memorize a frequency chart?

No. Reference when needed. Most musicians eventually internalize key frequencies (A4 = 440 Hz, middle C = 261.63 Hz, human hearing = 20 Hz to 20 kHz) through repeated use, but looking it up is always acceptable.

Why are some frequencies listed as “around 250 Hz” instead of exact?

Because instrument frequency ranges overlap and vary. A bass guitar’s fundamental usually sits 40–400 Hz, but harmonics extend higher. A male voice fundamentals are typically 85–180 Hz, but formants (resonance peaks in the voice) are much higher. Ranges are approximate because instruments are complex and produce multiple frequencies simultaneously.

What’s the difference between an audio frequency chart and a sound frequency chart?

In practice, they’re often the same or very similar. “Audio” typically refers to recorded/playback sound; “sound” refers to acoustic phenomena. Charts labeled differently might have slightly different organization, but the core data (Hz values, note labels) is usually identical.

Can I use a frequency chart on my phone for mixing?

Many mixing apps and frequency chart apps exist for phones. A smartphone screen’s size makes detailed charts harder to read than a desktop or printed chart, but they work for quick reference. For detailed mixing work, a larger screen is more practical.