Private, browser-based low-frequency diagnostics
Bass Test Online – Test Subwoofer & Low-Frequency Response
Test bass, subwoofers, low-frequency response, crossover behavior, rattles, room modes and speaker placement directly in your browser.
Quick Bass Test
Start at 80 or 100 Hz and move lower gradually. A preset starts that tone and sets the slider; move the slider for a custom frequency, then use Play selected tone.
Before you start
Play a tone or bass sweep and listen for weak bass, sudden dips, boomy peaks, rattles, distortion or a gap where the subwoofer and speakers meet. Repeat from another seat or subwoofer position to hear what changes.
No microphone is required. The browser generates the reference tones locally and sends them to your selected audio output.
This is a practical listening and troubleshooting tool, not a calibrated laboratory frequency-response measurement. Read about accuracy and limitations.
Bass Extension Check
Play tones from higher to lower and note where bass becomes weak or distorted. This is a listening comparison, not a measured limit.
How to useStart at 100 Hz, move downward one step at a time, and mark each tone clean until output clearly fades or distorts.
What it tells youThe lowest clean result is a repeatable listening reference, not a measured cutoff.
No extension observation recorded yet.
20–250 Hz Frequency Sweep
Run a bass sweep from 20 to 250 Hz. Listen for sudden dips, boomy peaks, buzzes, rattles or distortion.
How to useChoose a speed, start the sweep, and watch the current frequency when you hear a sudden change or noise.
What it tells youA repeatable peak, dip or rattle identifies an area to check again with a fixed tone; it is not a response measurement.
Rattle & Resonance Finder
Hold one frequency continuously, then nudge a few hertz in either direction until a noise is easy to reproduce.
How to useStart near the frequency where the problem appeared, play the continuous tone, then use ±1 or ±5 Hz adjustments.
What it tells youA frequency that reliably reproduces the noise helps isolate its source, but does not prove the driver is faulty.
Lower the volume before inspecting a cabinet, grille, stand, desk, shelf, cable or nearby object.
Crossover Blend Check
Check where your subwoofer hands bass to the main speakers. Listen for a weak gap, a boomy overlap or bass that seems to come from one spot.
Around 80 Hz is a common starting point in many systems, not a universal correct setting.
Room Position Compare
Play the same tone or sweep from two seats or subwoofer positions. Note where bass becomes stronger or weaker; the browser does not measure the room.
How to useUse the same signal and level at position A and position B, then record the same frequency range for each.
What it tells youA large position-dependent change suggests the room is contributing; it is an observation, not a measured pressure map.
Session Notes
Keep the observations that matter for your next comparison. Notes stay in this browser; no quality score is created.
A repeatable listening workflow
How to Test Bass Online
Use the same volume for each comparison and change one thing at a time. This makes differences easier to hear.
- 01
Turn the physical volume down
Begin with a moderate reference such as 80 or 100 Hz.
- 02
Confirm the output device
Make sure the intended speakers, headphones or subwoofer are selected.
- 03
Move downward gradually
Note where output becomes much weaker, distorted or absent.
- 04
Run the bass sweep
Listen for weak bass, sudden dips, boomy peaks, rattles and distortion.
- 05
Isolate anything suspicious
Hold a fixed tone and fine-tune around the problem frequency.
- 06
Check the crossover region
Listen for a weak gap or boom where the subwoofer and main speakers share bass.
- 07
Repeat from another position
If bass changes when you move, your room or placement is affecting what you hear.
Understanding the Bass Frequency Range
A bass frequency test compares individual tones; a sweep moves through the range. These labels are guides, not hard borders. The same tone may feel different depending on the speaker, room and playback level.
20–40 Hz
Deep extension, port or driver stress, room pressure effects
Often difficult for small speakers; capable subs or headphones are better suited.
40–60 Hz
Deep bass weight, room resonances, subwoofer capability
Useful for checking powerful low-end output without staying at the extreme bottom octave.
60–100 Hz
Punch, crossover integration, common subwoofer and main-speaker overlap
A practical range for system integration and bass localization checks.
100–160 Hz
Upper-bass body, crossover overlap, cabinet or room resonances
Often reproduced by the main speakers as well as the subwoofer.
160–250 Hz
Upper-bass and low-mid transition, warmth and potential boom
Useful for finding overlap or coloration as work shifts toward the main speakers.
Bass Extension
Play the tones from higher to lower. Note where bass becomes much weaker, disappears or distorts. A subwoofer may play lower than small speakers, but each setup has its own limits.
The lowest clean tone is a useful comparison point, not an exact cutoff. Volume, room acoustics, listening position and the speaker itself all affect the result.
Conceptual listening pattern only — not a frequency-response measurement.
Isolate before you diagnose
- 01Lower the playback level
- 02Hold the problem frequency
- 03Move ±1 to ±5 Hz
- 04Check nearby objects first
Rattles & Resonances
If a sweep exposes a problem, stop near that frequency and hold a fixed tone. Move a few hertz up and down until the noise is easiest to reproduce.
Then lower the volume and check the speaker cabinet, grille, stand, desk, shelves, cables and nearby objects before assuming the driver itself is damaged.
Subwoofer Crossover
A crossover decides which bass notes go to the subwoofer and which go to the main speakers. Around 80 Hz is a common starting point, but the right setting depends on your speakers, placement and room.
Listen for a smooth handoff. A weak gap or sudden boom may reflect the crossover level, phase, placement or room. Phase describes the timing relationship between the subwoofer and speakers; a poor match can weaken bass near the crossover.
Room Modes & Placement
Bass can sound strong in one seat and weak in another. Sound waves reflect between room surfaces and form standing waves. These room modes can boost some frequencies. At other spots, waves can weaken each other; this is called cancellation.
A dip does not automatically mean your subwoofer is faulty. Room cancellation, speaker or subwoofer placement, crossover settings, phase, EQ and your listening position can all affect what you hear. Try another seat or subwoofer position before drawing a conclusion.
Illustrative room-mode example — actual modal patterns depend on room dimensions, frequency and placement.
Speakers vs Headphones vs Subwoofers
Choose expectations that match the output device. A missing deep tone does not automatically mean the hardware is broken.
Subwoofer
Best suited to the deepest low-frequency checks and crossover or room-position comparisons.
Full-range speakers or studio monitors
Useful for checking where the mains begin to roll off and whether anything rattles at moderate bass levels.
Laptop or phone speakers
May reproduce little deep bass; missing sub-bass is not automatically a defect.
Headphones or earbuds
Can reproduce low frequencies without moving room air, but fit and seal can strongly affect perceived bass. Use the Headphone Test for fit-specific diagnosis.
How to Interpret Results
These listening clues suggest what to check next. A single seat or tone cannot diagnose hardware by itself.
| What you notice | What it may mean | What to try next |
|---|---|---|
| Very low tones fade gradually | Normal low-frequency roll-off or a system limit | Compare another output device; do not sharply raise volume to chase the tone. |
| One narrow frequency becomes much louder | Room mode, resonance or system emphasis | Move your listening position or subwoofer and repeat. |
| A frequency nearly disappears | Room cancellation, placement, crossover, phase, EQ or limited speaker output | Repeat from another position and review settings before assuming a fault. |
| Buzz or rattle at one frequency | Loose object, cabinet resonance, port noise, clipping or driver issue | Lower volume, clear nearby objects, then fine-tune around the frequency. |
| Bass sounds boomy around the crossover | Too much overlap, room reinforcement or level mismatch | Compare nearby tones and review crossover or level settings if available. |
| Bass seems disconnected or localized | High crossover, placement or excessive level may draw attention | Review placement, crossover and gain from the main listening position. |
| Headphone bass changes after reseating | Seal or fit may be affecting low-frequency perception | Use the dedicated Headphone Test for fit and seal checks. |
What This Bass Test Can and Cannot Tell You
It can help you
- Generate known low-frequency signals.
- Find obvious rattles and make them easier to reproduce.
- Reveal position-dependent peaks and dips.
- Compare extension and crossover impressions.
It cannot measure
- Calibrated acoustic frequency response or sound pressure level (SPL).
- Distortion percentage or subwoofer output at your seat.
- Whether one missing tone is caused by the room, processing, hardware, position or hearing.
- A quality score for your speakers, headphones or subwoofer.
Low-frequency safety: If a very low tone is difficult to hear, do not solve that uncertainty by sharply raising the volume. Lower frequencies can drive speakers hard even when they seem quiet.
For input checks, use the Microphone Test. Learn how browser audio works in Methodology, and read Accuracy & Limitations and Validation before interpreting results. See the Privacy Policy for local browser storage and the Disclaimer in the Terms of Use for use limits.
Bass Test Troubleshooting
Use these checks before deciding that a speaker, headphone or subwoofer is faulty.
No bass at all
Check the selected output device, mute state, system and app volume, subwoofer power, cable or connection, and any AVR or crossover settings.
Bass plays but the subwoofer is silent
Your system may be routing bass to the main speakers, the subwoofer may be disabled, or bass management and crossover settings may not be active.
Bass is much louder in one seat
The room may be boosting that frequency in some places and cancelling it in others. Repeat the same sweep from several seats before changing EQ or replacing hardware.
A tone makes furniture or the room buzz
Lower the level and isolate nearby objects. A rattle outside the speaker can mimic a driver problem.
Bluetooth bass sounds different
Bluetooth codecs, DSP, EQ, loudness processing and device profiles can change the result. Compare wired playback if available.
The sweep seems uneven on headphones
Fit, seal, headphone response and your own hearing can all affect perception. Use the Headphone Test for channel and fit checks.
Related Audio Tools
Continue with the dedicated tool for the next part of your diagnosis.
Frequently Asked Questions
Clear answers about online bass tests, subwoofer sweeps, crossover checks and low-frequency safety. Read about accuracy and limitations, or see the measurement methodology.
How do I test bass online?
Start at a low volume, play a moderate reference such as 80 or 100 Hz, then move gradually toward lower frequencies. Use the sweep to listen for dips, booms, rattles or sudden changes, and use a fixed tone to investigate anything suspicious.
What frequencies should I use for a subwoofer test?
Useful reference points include 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160 and 200 Hz. The most useful frequencies depend on your subwoofer, crossover and room.
What is a good bass test frequency?
There is no single best frequency. Around 80–100 Hz is an easy starting reference for many systems, while 20–60 Hz explores deeper sub-bass capability.
How low should my subwoofer play?
That depends on the subwoofer design, room, level and setup. Use the extension check to compare how output changes as frequency falls, but do not treat a browser listening test as a measured specification.
Why can I feel bass but barely hear the tone?
Very low frequencies can create physical pressure or vibration while pitch perception becomes less obvious. Your system, room and listening level all affect that sensation.
Why does bass get louder at certain frequencies?
A narrow boost can come from room modes, placement, crossover interaction or system voicing. Repeat the tone from another listening position to see whether the room is contributing.
Why does bass disappear at one frequency?
A dip does not automatically mean the subwoofer is faulty. Room cancellation, placement, crossover settings, phase, EQ and your listening position can all change what you hear. Move to another position and repeat before assuming a hardware problem.
How do I find a speaker or subwoofer rattle?
Run the sweep until the rattle appears, then stop near that frequency and hold a fixed tone. Move a few hertz up or down to reproduce it consistently, lower the volume, and inspect the speaker and nearby objects.
Can bass test tones damage speakers?
Excessive low-frequency level can stress drivers. Start low, avoid prolonged loud tones, and stop if you hear hard mechanical noises, severe distortion or strain.
Can I test bass with laptop speakers?
Yes, but many laptop speakers produce little deep bass. Missing very low tones on a small built-in speaker is not automatically a defect.
Can I use this bass test with headphones?
Yes. Headphones can reproduce deep bass without a subwoofer, but fit and seal can change what you hear. Use the dedicated Headphone Test if you are diagnosing channel balance or seal.
What is a bass sweep?
A bass sweep is a tone that moves continuously through a low-frequency range. It makes changes in output, resonances, rattles and room-related peaks or dips easier to notice than music.
What sweep speed should I use?
A slower sweep makes it easier to identify a specific problem frequency, while a faster sweep is useful for a quick overview. If you hear an issue, switch to a fixed tone for closer inspection.
What is a subwoofer crossover?
A crossover decides which bass notes go to the subwoofer and which go to the main speakers. Around 80 Hz is a common starting point, but the best setting depends on your equipment, placement and room.
How do I know if my crossover is set correctly?
Listen around the transition region for continuity. An obvious hole, sudden boom or bass that seems detached from the rest of the system can justify reviewing the crossover, level or placement.
Why does bass sound different when I move around the room?
Bass waves reflect between room surfaces. The resulting standing waves, or room modes, can make one tone louder in one spot and quieter in another. Move your seat or subwoofer and compare again.
Can this test measure my subwoofer frequency response?
No. Frequency response describes how loud a system plays at each frequency. This is a practical listening and troubleshooting tool, not a calibrated laboratory measurement. Measuring acoustic response requires a measurement microphone and suitable software.
Does this test need microphone permission?
No. The Bass Test generates audio for playback and does not need microphone access.
Does the Bass Test upload audio?
No microphone audio is captured for the basic Bass Test. The reference signals are generated locally in the browser.
What should I do if a very low tone is silent?
Do not sharply increase volume. Move to a higher reference frequency, confirm the output device is working, and consider that your speaker or headphones may simply roll off before that frequency.