What Is Audio Frequency? The Spectrum, Band by Band
Audio frequency is how fast a sound wave vibrates, measured in hertz (Hz), where one hertz is one cycle per second. Faster vibration means higher pitch. The range a healthy human ear picks up is conventionally given as 20 Hz to 20,000 Hz, and every kick drum, vocal and cymbal you have ever mixed lives somewhere inside it. Twenty years in and I still think of that span as a very long shelf where every instrument has been assigned a seat, and where the bass player keeps trying to sit on everyone else's.
The short version. The audible spectrum is split into seven working bands, from sub-bass at 20 Hz up to brilliance at 20 kHz. Knowing which band a problem lives in is most of mixing. Knowing that your monitors and your room only reproduce part of that span honestly is most of buying. If you want one pair that covers the range properly without a subwoofer, the Yamaha HS8 at 285 euro is the honest starting point.
Jump to:
What frequency actually measures
A sound wave is a pressure change moving through air. Count how many complete cycles of that change pass a point in one second and you have the frequency. Ten cycles a second is 10 Hz. Ten thousand is 10 kHz.
Two consequences matter for everything below.
An octave is a doubling. Not an addition. Going up an octave from 100 Hz gets you 200 Hz, and from there to 400 Hz. This is why the bottom of the spectrum feels cramped and the top feels enormous: the octave between 40 and 80 Hz is worth exactly as much musically as the one between 5 and 10 kHz, and it occupies a fortieth of the space on a linear graph.
Nothing you record is one frequency. A note has a fundamental, the lowest and usually loudest component, plus harmonics stacked above it at multiples of that fundamental. The fundamental tells you which note it is. The harmonics tell you whether it is a violin or a trumpet. That is why a bass guitar with its fundamental at 45 Hz can still vanish from a mix when you cut at 800 Hz, which is a lesson most of us learn the expensive way.
For reference, a piano runs from about 27.5 Hz at the bottom to roughly 4,186 Hz at the top. Everything above that top note, all the way to 20 kHz, is harmonics and air rather than fundamentals.
The seven bands, and who lives there
The industry splits the spectrum into seven working bands. Treat the boundaries as conventions rather than laws, because different sources move them by a few dozen hertz and nobody is wrong. What matters is the character of each region.
| Band | Range | What lives there | What too much sounds like |
|---|---|---|---|
| Sub-bass | 20 – 60 Hz | Felt rather than heard. Synth drops, the bottom of a kick, the lowest piano notes. | Nothing, until the neighbours arrive |
| Bass | 60 – 250 Hz | Weight and power. Bass guitar, kick body, the low end of a male voice. | Muddy, boomy, one-note |
| Low midrange | 250 – 500 Hz | Fundamentals of most acoustic instruments. Body of a snare, cello, lower brass. | Boxy, like a cardboard tube |
| Midrange | 500 Hz – 2 kHz | The bulk of most instruments and the core of a vocal. Where a mix earns its clarity. | Honky, nasal, telephone |
| Upper midrange | 2 – 4 kHz | Attack and intelligibility. Consonants, pick noise, drum transients. | Harsh, fatiguing after ten minutes |
| Presence | 4 – 6 kHz | Definition and forwardness. Cymbal edge, guitar and violin harmonics. | Brittle, in your face |
| Brilliance | 6 – 20 kHz | Air and sheen, made entirely of harmonics. Cymbal shimmer, breath, sibilance. | Hissy, sharp, all the s sounds |
One thing to hold on to: your ear is not equally sensitive across that table. Peak sensitivity sits roughly between 2 and 5 kHz, which is exactly where speech intelligibility lives and almost certainly not a coincidence. It also means a 2 dB boost at 3 kHz is far more audible than a 2 dB boost at 60 Hz, so the upper midrange rewards a light hand more than any other band.
What "45 Hz to 22 kHz" really promises
Here is where the spectrum stops being trivia and starts costing money.
A frequency range with no tolerance attached is close to meaningless. "45 Hz to 22 kHz" tells you the speaker produces something at those extremes. It does not tell you how much. The number that matters is the one written as a tolerance, usually a figure like plus or minus 3 dB, because that says the response stays within a defined window across the stated range. A spec quoted without that window is marketing rather than measurement. We take that apart properly in our guide to reading a monitor's frequency response.
Driver size sets the floor. Low frequencies need a lot of air moved, and moving air needs cone area or excursion. This is why a 4-inch woofer in a small cabinet does not reach 40 Hz at a useful level however confident the box is, and why an 8-inch does. It is physics rather than a conspiracy, and the trade-offs are covered in our piece on what a monitor's woofer is actually doing.
So a subwoofer is sometimes the honest answer. If you work with material that genuinely lives below 50 Hz, adding a sub to competent small monitors usually beats buying larger monitors you cannot place properly. Which leads directly to the part nobody selling speakers wants to say out loud.
Below 200 Hz, the room is in charge
This is the one strong opinion in this article, and it argues against a good chunk of our own monitor sales.
Under roughly 200 Hz, what you hear is decided by your room, not by the number on your monitors. Low frequencies have wavelengths measured in metres, they reflect off your walls and interfere with themselves, and the result is that some notes disappear at the mixing position while others double in level. Move your head half a metre and the bass changes. No specification sheet can survive that.
We had a customer with 8,000 zł monitors in an untreated room who still could not trust the low end. Three hundred zloty of corner bass traps did more for his mixes than the speaker upgrade had. That is not a slogan, that is the order of operations: fix the room, then the speakers. Getting the acoustics and the placement right costs a fraction of what the next monitor upgrade costs, and it is the only thing that makes the bottom two bands of that table mean anything.
Headphones sidestep the room, which is genuinely useful, though a sealed cup adds cavity resonances of its own that make the low end harder to judge. Use them to check detail and call the final low-end decision on monitors in a treated room.
About 432 Hz
People ask this constantly, it appears in Google's own "people also ask" box for this topic, and not one of the pages ranking above us goes near it. So, briefly and without smirking.
Concert pitch is standardised: the A above middle C is 440 Hz, fixed by ISO 16:1975 with a tolerance of half a hertz. Tuning to 432 Hz simply means shifting that reference down by 8 Hz, which is roughly a third of a semitone. Every other note moves with it.
Does it sound different? Slightly, in the way any small pitch shift sounds different, and some players genuinely prefer the feel. Does it carry the healing or resonance properties attributed to it online? There is no reliable evidence for that, and the claims tend to arrive with more numerology than measurement. Tune to it if you like how it sits under your voice. Just be aware you will be out of tune with every other recording on the planet, which makes collaboration an adventure.
Seven ways to hear the range honestly
All on our shelves, prices as of today, arranged by how much of the spectrum they actually deliver.
1. ADAM T7V, 219 euro. A 7-inch woofer and ADAM's U-ART ribbon tweeter, which is an unusual amount of top-end extension at this price. The sensible first real monitor.
2. Yamaha HS8, 285 euro. The 8-inch driver is the point. It buys you genuine reach into the bass band without a subwoofer, and the HS voicing has been unflattering to bad mixes for two decades on purpose.
3. Kali Audio IN-8 V2, 365 euro. Three-way with the midrange driver mounted coaxially, so the midrange band arrives from the same point in space as the highs. If your problem is the crowded 500 Hz to 2 kHz region, this is the one that helps.
4. Genelec 8020D, 454 euro. Small, superbly engineered, and deliberately honest about not reaching sub-bass. Buy it for a small room where a big cabinet would be a lie, then add the next item if you need the bottom octave.
5. ADAM T10S, 389 euro. The subwoofer that turns any of the above into a full-range system, with a crossover you can actually set. Cheaper and more placeable than jumping two monitor sizes.
6. Beyerdynamic DT 990 PRO, 148 euro. Open-back, and the standard second opinion when you want to check detail without the room joining in.
7. Neumann NDH 30, 584 euro. The far end of that idea: open-back headphones built to a monitoring standard rather than a listening one. This is a considered purchase, and we would rather say so than pretend everyone needs it.
Frequency response is the one specification you genuinely cannot hear from a product page, because the number describes the speaker and the argument happens in your room. Our Warsaw showroom on Nowogrodzka has these set up in a treated space, so you can play the same track through a 4-inch and an 8-inch and hear precisely where the bottom octave appears. Or take a pair home on a free 30-day Test-Drive: a short contract, real sessions in your own room, then you decide. Everything carries a 36-month warranty, 60 months on PMC and ADAM Audio, there is a 30-day return window, and we ship to every EU country.
Straight answers
What is the frequency of audio?
Audio frequency is the number of times a sound wave completes a cycle each second, measured in hertz. The audible band is conventionally given as 20 Hz to 20,000 Hz. Below 20 Hz is infrasound, which you feel rather than hear, and above 20 kHz is ultrasound, which humans do not perceive as pitch at all.
Is 20,000 Hz audible?
For most adults, no. Twenty kilohertz is the textbook upper limit for a healthy young ear, and upper-frequency sensitivity narrows with age and noise exposure, so many adults top out somewhere well below it. This matters less for mixing than people fear: almost nothing musical has fundamentals up there, only harmonics and air.
What does 432 Hz frequency do?
It retunes everything down by about a third of a semitone. Standard concert pitch puts the A above middle C at 440 Hz under ISO 16:1975, so tuning to 432 Hz shifts that reference by 8 Hz and every other note follows. It changes the pitch, and some musicians prefer how it sits. The healing and resonance claims attached to it online are not supported by reliable evidence.
What frequency is bass?
The bass band runs roughly 60 to 250 Hz, with sub-bass below it from 20 to 60 Hz. A bass guitar's lowest string has a fundamental around 41 Hz, and a kick drum's weight typically sits between 60 and 100 Hz. Most of what makes bass audible on small speakers, though, is its harmonics higher up, which is why a mix can still read as bass-heavy on a phone.
What does the frequency range on a speaker specification mean?
It states the lowest and highest frequencies the speaker reproduces, but the figure only means something when a tolerance is attached, typically written as plus or minus 3 dB. That tolerance defines how flat the response stays across the range. A range quoted with no tolerance tells you the speaker makes some sound at those extremes, not that it makes a useful amount.
About the author
Michał Kaniuszkiewicz is a content manager and SEO specialist at Wired Tunes. He creates and optimizes content that helps readers find useful information about music, gear, and sound. Beyond his editorial work, he has been making music for 8 years in hip-hop, pop, and electronic genres — giving him insight into the subject not just from an SEO perspective, but from the inside, as a practicing musician and producer. This experience allows him to create content that's equally useful and clear for both beginners and experienced listeners and music creators.
Read next
- Active Studio Monitors: How to Choose. Turning the band theory above into an actual pair on your desk.
- Studio Monitor Placement. The cheapest fix for the low end, and it costs nothing but an afternoon.
- How to Choose Studio Headphones. The other way to hear the spectrum when the room refuses to cooperate.
