Bass Test
Find where your subwoofer, speakers, or headphones stop reaching — sine tones from 10 Hz to 200 Hz.
60 Hz
ReadyTurn your system volume down first
Start at a low volume, especially with headphones and low bass tones, then raise it slowly.
Safety: low tones push drivers hard — keep the volume low. Hearing (or only feeling) 10 Hz is normal on most systems.
This tool runs locally in your browser — no audio is uploaded.
How to use
- 1
Protect your gear first
Set the volume slider low (default 30%) and your system volume moderate. Low sine tones move drivers hard; buzzing at high volume can damage small speakers.
- 2
Sweep down manually or automatically
Play a frequency, or start the descent from 150 Hz to 10 Hz. When the tone stops being clear — or your cabinet starts rattling — press Mark to record the frequency.
- 3
Read the result
Below the marked frequency your system rolls off or distorts. Subwoofers typically reach 25–35 Hz; bookshelf speakers often stop near 50–60 Hz; earbuds vary widely.
How it works & limits
A pure sine tone generated by the Web Audio API is the cleanest way to probe low-frequency reach: unlike music, it contains nothing else, so what you hear (or do not hear) is that single frequency. Band presets (Sub 10–30 Hz, Deep 30–60 Hz, Mid 60–100 Hz, Upper 100–200 Hz) reflect how these ranges behave on real systems.
Hearing 10 Hz is rare and mostly felt as vibration rather than sound; losing output below 40 Hz on small speakers is normal, not a defect. Browser output is uncalibrated, so treat the marked frequency as an estimate — for tuning a subwoofer crossover, trust measurements with a calibrated microphone over any browser test.
FAQ
Why do I feel 10 Hz more than hear it?
Human hearing is extremely insensitive at 10 Hz — you mostly feel air movement or cabinet vibration. It is a useful check that a subwoofer moves, not that you "hear" it.
My speaker buzzes on low tones — is it broken?
Often the buzz comes from a desk, wall, or object resonating, not the driver. Isolate the frequency with the tone generator, then press on nearby surfaces while it plays to find the culprit.
What frequency should a good subwoofer reach?
Most home subwoofers reach 25–35 Hz cleanly. Content below 20 Hz is rare in music and movies; claiming "10 Hz" output matters less than clean output at 30 Hz.
Is the descent result a precise measurement?
No. Room acoustics, volume setting, and your hearing all shift the result. Use it to compare systems or spot problems, not as a specification.
Why does my headphone bass disappear below 30 Hz?
Many headphones roll off steeply below 30 Hz by design; a few extend to 10 Hz with EQ. Seal quality changes bass more than anything else — re-seat the earpads and check the marked frequency again.
Related tools
Speaker Test
Stereo balance, frequency sweep, phase, and sub-bass checks for any speaker system.
Open toolFrequency Sweep Test
Sweep 20 Hz–20 kHz with adjustable duration, direction, and linear/log scaling.
Open toolTone Generator
Play sine, square, sawtooth, or triangle tones at any frequency from 20 Hz to 20 kHz.
Open toolSpeaker Phase Test
Compare in-phase vs out-of-phase tones to catch reversed speaker wires.
Open tool