Test low-frequency bass from 20 Hz to 250 Hz and check your speakers, headphones and earbuds for bass, buzzing, rattling and distortion.
Bass tones can become uncomfortable or produce strong vibrations at higher volume. Start at a low volume and increase gradually. Stop the test immediately if the sound becomes uncomfortable, excessively loud or causes unexpected vibration.
Sweep smoothly through the low-frequency spectrum to detect enclosure resonances, driver rattles, and bass crossover dropouts.
Click any bass frequency on the scale to immediately hear its tone and evaluate cone displacement.
Start quietly. Very low frequencies create strong cone excursion or mechanical vibration.
"Not audible" is normal for smaller desktop speakers.Listen for visceral kick slam, driver rumble, and port air chuffing.
Listen for punch, tightness, and evaluate whether bass sounds boomy or muddy.
Learn how to test bass frequencies, sub-bass and low-frequency audio using your speakers, headphones, earbuds and sound systems. Understand how to safely test bass and identify audible buzzing, rattling or distortion.
Bass describes the lowest frequencies of sound that humans can hear, typically spanning 20 Hz to 250 Hz. In music, bass forms the harmonic foundation, driven by kick drums, bass guitars, synthesisers, and cinematic low-frequency effects.
Sub-bass occupies the lowest octave between 20 Hz and 60 Hz. Because sound waves at these frequencies measure up to 17 meters in length, they are experienced as physical chest vibrations and deep room pressurization.
Acousticians subdivide bass into three primary bands: deep sub-bass (20–40 Hz), sub-bass (40–80 Hz), and mid-to-upper bass (80–250 Hz). Above 250 Hz lies the lower midrange.
A bass test plays pure, mathematically controlled sine waves to inspect low-frequency driver excursion, cabinet sealing, voice coil linearity, and room resonance points.
Place desktop speakers on isolating rubber pads to decouple them from vibrating desks. Run a sweep from 100 Hz down to 35 Hz at moderate volume, listening for clean low-end tones and enclosure buzzes.
Ensure ear cushions rest firmly against your skull without gaps caused by thick glasses. Test 30 Hz to 80 Hz tones to verify both ear cups produce identical sub-bass output without rattles.
Earbud dynamic drivers rely on a sealed ear canal volume to generate pressure at 40 Hz. If bass sounds thin or metallic, replace ear tips with a larger size that forms a complete acoustic seal.
Play tones between 40 Hz and 60 Hz at a controlled 30% volume. Subwoofers should produce effortless, deep rumble without port whistling, chuffing, or cone scraping.
Deep bass (20 Hz–35 Hz) demands high electrical power and physical excursion. Start at low gain and watch cone movement. Do not force small speakers to reproduce 25 Hz at high volumes.
Mid-bass (90 Hz–200 Hz) carries rhythmic punch and guitar body. Check whether 120 Hz tones sound tight and articulate rather than resonant, hollow, or boomy.
20 Hz is the theoretical lower limit of human hearing. Generate a 20 Hz sine tone at moderate volume. You may feel slow cone excursion before hearing sound; absence of sound is normal on compact speakers.
30 Hz is a critical frequency for home theater subwoofers and EDM bass drops. A capable subwoofer reproduces 30 Hz cleanly without audible wind turbulence or chassis vibrations.
40 Hz represents the low E note of acoustic upright bass and bass guitar. It is an ideal benchmark for bookshelf speakers and premium closed-back studio monitor headphones.
60 Hz is the standard acoustic power zone for rock and electronic kick drums. Solid output at 60 Hz delivers punchy, physical impact in music listening environments.
80 Hz is the standard crossover frequency for home cinema receivers. Test 80 Hz to ensure seamless acoustic integration between main stereo speakers and subwoofers.
100 Hz tests upper-bass definition. Excessive room modes at 100 Hz can cause music to sound muddy, muffled, or unpleasantly tubby.
Select 20 → 250 Hz with a 10s duration. Click 'START SWEEP'. Listen for sudden peaks in volume (room resonances) or sharp drops (crossover phase cancellations).
Harmonic distortion introduces higher buzzy overtones into an otherwise pure low-frequency sine tone. If a 50 Hz tone sounds like a raspy buzzing comb, driver clipping is occurring.
Play a continuous 60 Hz tone. Touch the speaker grille, desk, or mounting plate. If the buzz disappears when pressing a part, the buzz is mechanical rather than electrical.
Rattles are usually caused by objects on your desk (pens, keyboards, mugs) vibrating against the surface. Move nearby items away while playing 40 Hz to isolate the source.
Weak bass is most commonly caused by acoustic cancellation (speakers placed in room nulls), phase-reversed wiring, or poor ear tip seal on in-ear monitors.
Boomy bass results from room modes and boundary loading when speakers are pushed directly into room corners without acoustic bass traps.
Low frequencies demand substantial physical voice coil motion. Worn spiders, dried cone surrounds, or bent voice coil formers can rub against magnetic pole pieces.
Headphones produce bass through acoustic pressure chambers. If your ear pads are worn or hair breaks the seal around your ears, sub-bass air pressure leaks out immediately.
Human ears require up to 60–70 dB more acoustic energy to hear 20 Hz compared to 1 kHz. Lack of perception is an auditory biological characteristic, not proof of defective hardware.
Use 'TEST LEFT' and 'TEST RIGHT' to verify individual woofer drivers. Ensure each speaker handles low-end tones with identical output loudness and zero channel imbalance.
Always begin testing at 25%–30% volume. Deep bass carries heavy mechanical excursion; never turn volume to maximum to force small speaker cones to produce sub-bass.
Objective bass measurement requires a calibrated measurement microphone, an anechoic chamber or calibrated coupler, and acoustic impulse software. Browsers synthesize pure digital signals only.
A bass test is a specialized audio diagnostic using controlled low-frequency acoustic signals (typically 20 Hz to 250 Hz) to evaluate how accurately speakers, subwoofers, headphones, and earbuds reproduce deep low-end sound without distortion or physical rattling.
In acoustic engineering, the bass range spans from approximately 20 Hz to 250 Hz. Sub-bass covers 20 Hz–60 Hz, low bass spans 60 Hz–120 Hz, and mid-bass / upper bass occupies 120 Hz–250 Hz.
Sub-bass refers to the lowest octave of audible sound, typically between 20 Hz and 60 Hz. These frequencies are often felt physically as visceral pressure or room rumble rather than heard as distinct musical tones.
Position speakers securely away from loose tabletop objects, start at a low volume (30%), and play test tones from 100 Hz stepping down toward 40 Hz. Listen for clean bass output and watch for loose cabinet grilles or surface rattling.
Wear your headphones properly so the ear cushions create an airtight seal around your ears. Start at 20%–30% gain and listen across 30 Hz to 120 Hz for even low-end extension and zero driver scraping.
Earbuds rely entirely on an airtight seal within the ear canal to reproduce frequencies below 80 Hz. Ensure proper silicone tip sizing, then test tones between 40 Hz and 100 Hz.
Use the Deep Bass presets (20 Hz, 25 Hz, 30 Hz, 35 Hz, 40 Hz) at a moderate volume. Deep bass requires large cone displacement; listen for effortless low-end output rather than speaker distress.
20 Hz represents the bottom limit of human hearing. Play a 20 Hz sine tone at low volume. You may feel a slow air pulsation or mechanical driver excursion before perceiving pitch. Many small speakers cannot reproduce 20 Hz audibly.
40 Hz is the standard low-E string frequency on a four-string bass guitar. Play a 40 Hz sine wave to test subwoofer authority and deep electronic sub-bass extension.
60 Hz is the classic punch frequency for electronic kick drums. It provides a solid benchmark for desktop speaker bass punch without over-stressing smaller drivers.
80 Hz is the standard THX subwoofer crossover frequency. Tones at 80 Hz test whether satellite speakers smoothly blend with dedicated subwoofers.
100 Hz represents upper mid-bass warmth. Listen for punchy, tight transients and verify the driver doesn't sound bloated, muddy, or boomy.
A bass sweep smoothly glides an oscillator across low frequencies (e.g. 20 Hz to 250 Hz). It immediately highlights sympathetic resonances, loose cabinet screws, and frequency response dropouts.
Human hearing is much less sensitive to low frequencies according to equal-loudness contours (Fletcher-Munson). Small speakers and non-sealed earbuds physically lack the driver diameter or excursion needed to pressurize air at 20–30 Hz.
Buzzing is caused by physical vibration: loose speaker grilles, vibrating cable connectors, unpadded tabletop surfaces, or voice coils scraping inside the magnetic gap.
Low-frequency sound waves carry significant kinetic energy. Rattling typically occurs when speaker cabinet walls, loose mounting screws, or nearby tabletop items vibrate in sympathy with the bass tone.
Bass distortion happens when amplifiers run out of headroom (clipping) or when speaker voice coils are driven past their maximum linear physical excursion limit ($X_{\text{max}}$).
Compact speaker cabinets, small woofer diameters (under 4 inches), unsealed enclosures, or poor room placement away from boundaries naturally roll off bass response below 80 Hz.
Incomplete ear cushion seal, worn pads, or high output impedance on audio jacks can leak low-frequency pressure, leading to weak or anemic sub-bass.
No. Measuring true speaker bass response requires a calibrated measurement microphone placed in an anechoic chamber or ground-plane acoustic environment with specialized measurement software.
No. Measuring headphone bass response curves requires an IEC 60318-4 acoustic ear coupler simulator and artificial head fixture.
No. Sound Pressure Level (SPL) requires calibrated physical acoustic sensors. This tool measures digital browser synthesizer signal levels in dBFS.
No. Total Harmonic Distortion requires measuring analog microphone output with dedicated audio analysis hardware.
Only if played at excessively high volumes for prolonged periods. The tool defaults to a safe 30% volume and soft ramps to protect voice coils.
Always start low at 20%–30% volume. Deep bass carries substantial mechanical excursion; never push volume high while hunting for inaudible 20 Hz tones.
Yes, when conducted at moderate volume. Stop immediately if you hear mechanical cone bottoming out, crackling, or feel acoustic discomfort.
Generate bass frequencies from 20 Hz to 250 Hz and explore deep bass, sub-bass and mid-bass directly in your browser.
