Prepare the System
Lower the subwoofer, receiver, device, and tool level; secure loose nearby objects and confirm the intended output path.
Low-frequency workspaceLocal audio
Ready — sound is off
Bass frequencies
Current signal40 Hz steady sine
Browser audio signal toolkit
Online Subwoofer Test
Explore low-frequency playback from 20 to 200 Hz with cautious sine presets, a steady tone, or a timed upward or downward bass sweep.
What Is a Subwoofer Test?
A subwoofer test supplies controlled low-frequency signals so you can make basic subjective observations about bass playback. This panel focuses on 20–200 Hz, with steady sine tones at practical checkpoints and logarithmic sweeps in either direction. It can help reveal an obvious rattle, dropout, routing issue, or room-dependent peak, but it does not measure bass extension or produce a quality score.
The browser schedules a digital sine signal only after you press Start Test. Sine is the default because its source contains one sinusoidal frequency rather than intentional harmonics that might be reproduced by smaller speakers even when the fundamental is weak. The acoustic result still includes hardware distortion, processing, placement, and room behavior, so an online subwoofer test cannot isolate the subwoofer on its own.
Three simple steps
How to Get Started
Use this subwoofer test deliberately: set the signal, begin quietly, and interpret only what the workflow can actually show.
Choose Tone or Sweep
Select one 20–200 Hz sine preset for a steady check, or set a timed low-to-high or high-to-low sweep.
Listen Briefly and Stop
Note approximate frequencies where symptoms appear, then stop immediately at strain, discomfort, or excessive movement.
Useful Bass Test Frequencies from 20 to 200 Hz
The presets divide the low-frequency region into repeatable points. Twenty to 30 Hz explores very deep bass that many systems reproduce weakly; 35 to 60 Hz covers powerful low bass common in effects and music; 70 to 100 Hz reaches upper bass; and 120 to 200 Hz approaches the region where subwoofers often overlap with main speakers. These descriptions are approximate, not pass/fail bands.
Begin the subwoofer test around 60 or 80 Hz at low level to confirm the path before moving downward. A missing 20 Hz fundamental is expected on many products and does not prove failure. If a specific point causes a rattle, stop and inspect the room and hardware rather than driving it harder. Use small level changes only.
Steady Tones vs Bass Sweeps
A steady tone holds one frequency, making it easier to reproduce a symptom and inspect nearby objects. A bass sweep moves continuously through 20–200 Hz and can reveal where perceived level or vibration changes. The upward and downward modes cover the same range in a different order. Duration controls how slowly the sweep passes each region.
Use a sweep for discovery and a low-level steady tone for careful follow-up. Looping is off by default so the subwoofer test does not continue unexpectedly. If a sweep reveals a dramatic event, stop first, reduce the level, and select the nearest preset. Repeated high-level sweeps can stress equipment and hearing without adding useful information.
Listening for Rattles and Room Resonances
Low frequencies can vibrate objects far from the loudspeaker. A buzz may come from a grille, cabinet, cable, shelf, window, vent, light fitting, or loose item. Room modes can make one bass frequency sound strong at one seat and weak a short distance away. The online subwoofer test shows the requested frequency but cannot determine which object or acoustic mode caused the observation.
Stop playback before touching equipment or moving objects. Repeat only at a lower level, and change one item or listening position at a time. A symptom that remains attached to the speaker may require inspection or qualified service. Do not continue driving a unit that shows obvious distress, scraping, strong distortion, or uncontrolled cone movement.
Bass Extension Is Not the Same as Loudness
Bass extension describes how far a system reaches into low frequencies under defined conditions. Loudness at one tone does not establish extension, and a room resonance can make a limited system sound strong at a particular point. Distortion products may also be audible above a weak fundamental, creating the impression that very deep bass is being reproduced cleanly when it is not.
A valid extension claim needs a stated tolerance, measurement method, level, and environment. This subwoofer frequency test has no calibrated microphone or feedback path, so it cannot provide that result. Use it to note subjective changes and reproduce obvious symptoms. Use suitable measurement tools for numerical response, distortion, or maximum-output work.
Why Small Speakers May Not Reproduce Deep Bass
Long-wavelength low frequencies demand displacement. Small phone and laptop drivers move limited air and operate in compact enclosures, so deep bass is often filtered or reduced to protect them. A tiny device that plays a 1 kHz check but seems silent at 25 Hz is behaving within common physical constraints, not necessarily showing a fault.
Do not raise the online subwoofer test level to force a small speaker to respond. You may hear harmonics, port noise, protection processing, or cabinet vibration instead of the selected fundamental. Use bass-focused signals only with equipment intended for them, begin around a moderate low frequency, and descend cautiously.
What an Online Subwoofer Test Cannot Measure
This page cannot measure frequency response, phase alignment, crossover slope, group delay, distortion, maximum output, electrical power, or dB SPL. It does not know the receiver trim, room correction, crossover, placement, listening position, or whether a subwoofer is receiving a dedicated channel. The progress indicator represents the generated sweep, not captured acoustic data.
Calibrated acoustic work requires a suitable measurement microphone, known reference, software, positioning, and interpretation. Electrical diagnosis may require different instruments. The subwoofer test is a local signal source for initial listening and troubleshooting. It should not be presented as proof that equipment meets a specification or is correctly calibrated.
Subwoofer Test Safety
Low tones may not seem subjectively loud while still demanding substantial driver movement and amplifier power. Set every gain stage low before playback and increase only in small steps if the equipment remains comfortable. Keep test periods short. Stop immediately if you hear mechanical noise, strong distortion, or experience discomfort. Never leave looping enabled unattended.
Bass can travel through structures and disturb other people, so choose an appropriate time and environment. The browser output percentage is digital gain, not a statement of sound pressure. This online subwoofer test is not a hearing diagnostic tool and offers no medical guidance. You remain responsible for safe equipment settings, exposure, placement, and surroundings.
Crossover and Placement Observations
The 80–150 Hz region may involve both a subwoofer and main speakers, depending on crossover settings. Perceived dips or peaks can come from relative phase, distance, room interaction, filters, or level matching. A tone can help reproduce the observation, but changing crossover or phase controls without a method can trade one listening-position problem for another.
Document current settings before making adjustments. Compare from the normal listening position and one nearby position at the same low level. If the result changes greatly with position, room interaction is likely involved, but the subwoofer test still cannot quantify it. Measurement and careful placement work are the appropriate next steps for systematic integration.
Clear answers
Frequently Asked Questions
What frequency should I start a subwoofer test with?
Start around 60 or 80 Hz at low level to confirm the signal path, then move gradually. Beginning at 20 Hz can encourage unsafe level increases when deep output is weak.
Why can I hear 40 Hz but not 20 Hz?
The subwoofer, filters, room, level, and hearing can all reduce very deep bass. Many systems do not reproduce 20 Hz strongly, and that listening result alone is not a defect diagnosis.
Should I use a steady tone or bass sweep?
Use a sweep to locate broad changes and a steady low-level tone to repeat a specific symptom. Stop before switching and keep sessions brief.
Can this test measure my subwoofer extension?
No. Extension is a quantitative result requiring a defined tolerance and calibrated measurement setup.
Why does bass change when I move around the room?
Reflections and room modes create position-dependent reinforcement and cancellation. The generator supplies a source but does not separate or measure those effects.