Subwoofer Test: Free Online Bass Test From 10Hz to 200Hz
Click any frequency button on this subwoofer test to find exactly where your bass response drops off. The check speaker output quality needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
Run this subwoofer and bass test at low volume to hear what your audio equipment can really do: it plays clean low-frequency sound through your subwoofers, speakers or headphones, so you find the lowest note your system plays cleanly and catch distortion before it costs you a driver. Bass enthusiasts and car installers use this subwoofer test too.
How This Online Subwoofer Test Works
The tool is a browser tone generator: pick a pitch with the frequency slider or presets, press play, and your audio output device reproduces it. For car audio, the 20Hz to 80Hz span is a car bass test covering most notes that shake vehicles; at home, the full 10Hz to 200Hz range shows where speakers and earbuds fade. It is a free online bass test that, like a subwoofer simulator, shows the current frequency. The speaker polarity test needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
Sine Wave Sweep or Fixed Test Tone
A frequency sweep glides one sine wave from 150Hz toward 10Hz over about 60 seconds; a fixed tone holds one pitch while you hunt buzz. Both are pure tones, clean sine waves without harmonics, and continuous tones beat bursts. For offline low frequency tones, download bass tones as wav files: mp3 compression adds hiss to the deepest sound files.
Sub-Bass to Upper Bass: The Bass Test Frequency Range
Every bass test splits the frequency range into bands for music, movies and gaming; the lowest frequencies are felt more than heard. The test left right speaker channels needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
| Band | Range | What you notice | Typical sources |
|---|---|---|---|
| Sub-bass | 10–40 Hz | Physical rumble, tactile vibration | Film explosions, organ pedals |
| Deep bass | 40–60 Hz | Weight under the beat | Synth bass |
| Mid-bass | 60–120 Hz | Punch and warmth | Kick drums, bass guitars |
| Upper bass | 120–200 Hz | Body and fullness | Male vocals, cello |
Bass test songs mix all four bands at once; a single tone shows which one is weak.
Reading a Low Frequency Response Test: Lowest Frequency and Roll-Off
In a low frequency response test, the lowest frequency you still hear cleanly is your floor; the slope below it is the roll-off. Larger drivers and sealed enclosures keep low-frequency response flatter toward 20Hz. Below that sits infrasound, subsonic frequencies outside the human hearing range, so silence there is normal. Sudden volume drops between neighbouring frequencies usually mean a room null. If your low-end stops near 50Hz, add a dedicated subwoofer. Pair a low frequency test with a subwoofer kick test.
Checking Harmonic Distortion With Pure Test Tones
A pure tone has no overtones, so any higher pitch you hear is harmonic distortion: spectral components added as cone excursion grows with sound pressure (the bass-end twin of digital aliasing). Take 35Hz: its harmonics sit at 70Hz (one octave up), 105Hz and 140Hz.
- Play 70Hz and 105Hz so you know how those overtones sound.
- Drop to 35Hz without touching the volume.
- If the tone thins out while a higher overtone appears, the loudspeaker is distorting.
So a subwoofer audio test with single tones beats a sound test or audio test built on music.
What Total Harmonic Distortion (THD) Means
Total harmonic distortion sums every harmonic as a percentage of the fundamental. At 10%, the products sit 20 dB below the tone and are largely masked, the usual loudspeaker benchmark. Exact figures need a calibrated measurement microphone; staying clean when loud is real audio quality.
Finding a Sofa-Position Null With the Tone Generator
The question I'm answering is simple: should a sofa sitting 3.18 m from the front wall of a 6.37 m long living room stay where it is? The short answer the tones give is no: that seat sits in a near-total null at 27Hz and on a peak at 54Hz, and moving it to 4.25 m evens both out.
I start the bass test sweep at a 60Hz reference level, sitting where my head actually goes. Around 54Hz the bass swells; around 27Hz it nearly vanishes, even though the sub's spec sheet claims useful output to 24Hz. Rather than blaming the sub, I check the length mode by hand:
- 1st axial mode: 343 ÷ (2 × 6.37) = 26.9Hz
- 2nd axial mode: 2 × 26.9 = 53.8Hz
- 3rd axial mode: 80.8Hz, right at an 80Hz crossover
To confirm what the 27Hz and 54Hz test tones showed: the seat is at 3.18 ÷ 6.37 = 0.499 of the room length, dead centre, which is exactly where the 1st mode cancels and the 2nd peaks. Using the cosine pressure shape of each mode, I compare three seat positions:
| Seat from front wall | 26.9Hz level | 53.8Hz level |
|---|---|---|
| 3.18 m (current) | −52 dB (null) | 0 dB (peak) |
| 1.60 m | −3 dB | −43 dB (null) |
| 4.25 m | −6.0 dB | −6.1 dB |
The 4.25 m spot is the one I'd pick: both modes land within 0.1 dB of each other, so the low end stops swinging between boom and silence. After moving the sofa, I rerun the same subwoofer bass check at 27Hz and 54Hz and they sound close in loudness, which matches the table.
Two caveats matter. Drywall leaks low bass, so the real null is shallower than −52 dB; the math tells you where to sit, not the exact depth. And never fix a null with an EQ boost: each extra 3 dB doubles the power needed, while the cancellation eats it anyway. The input that matters most is seat position, not the sub. The 80.8Hz mode is the next thing I'd test, since it sits on the crossover point and can make the handoff to the main speakers sound lumpy.
Improving Bass Response After a Subwoofer Sound Test
Uneven results usually come from the room and settings. Fix these, then rerun the subwoofer and bass test to confirm better bass performance across your audio setup.
Speaker Placement and the Subwoofer Crawl
A corner uses walls and floor as room boundaries for free bass reinforcement. For the subwoofer crawl, put the sub on your seat, play a 45Hz test tone, crawl along the walls, and place the sub where bass sounds most even.
Room Acoustics and Standing Waves
A 35Hz wave is 9.8 m long, so room acoustics dominate. Standing waves form between parallel walls at \(f = \frac{c}{2L}\). In a 5.2 m room:
$$f = \frac{343}{2 \times 5.2} \approx 33.0\ \text{Hz}$$
Expect boom near 33Hz and 66Hz in some seats and dead spots in others.
Cross-Over Frequency, Box Tuning Frequency and Amplifier Output
Set the cross-over frequency near 80Hz so the main speakers carry midrange and treble with clarity. Play tones either side of 80Hz to hear a smooth handoff. Match the box tuning frequency to the enclosure tuning spec, then play tones just below it: a flapping port means you need a subsonic filter. Keep EQ gentle: each 3 dB of equalizer or bass boost doubles the amplifier power needed, clipping amplifiers into a muddy sound.
Safe Listening Levels for Any Subwoofer and Bass Test
Bass is the quickest way to damage a sound system, so treat every speaker bass test as a slow climb.
- Set your listening level on a 60Hz tone and never raise it for lower ones; blowing your speakers on silent infrasound is common.
- Stop at the first rattling sound from the cone.
- Rattles from trim or shelves are loose components; tighten them so vibrations don't mask real distortion.
- Basshead tracks and bass test songs come after the tones prove your speaker system handles the level.
Frequently Asked Questions
- What does a bass test actually check?
- It plays low-frequency sine tones through your speakers, subwoofer or headphones so you can hear the lowest note they reproduce cleanly and spot rattles or distortion along the way.
- Can a subwoofer test damage my speakers?
- Yes, if you play loud tones below about 30Hz on speakers that aren't built for them. Set the volume on a higher tone first, never raise it for lower tones, and stop as soon as you hear rattling or flapping.
- Why can't I hear the lowest frequencies?
- Small drivers in laptops, phones and earbuds roll off well above 20Hz, and human hearing sensitivity falls sharply at the bottom of the bass range. Below about 20Hz you may only feel vibration, which is normal.
- How do I find my lowest audible frequency with a sweep?
- Play the sweep, note the second the bass fades, then enter the start frequency, end frequency, sweep length and that second. The tool works out the frequency that was playing at that moment.
- Should I feel bass or hear it?
- Both. Sub-bass is felt as much as heard, while mid-bass and upper bass give punch and warmth you clearly hear. Feeling vibration without a clear tone at very low frequencies is expected.
- How do I hear harmonic distortion with test tones?
- Play the 2nd harmonic (twice the test tone frequency) first, then the test tone at the same volume. If you hear that higher pitch while the low tone plays, your system is adding harmonic distortion.
- What range should a good subwoofer cover?
- A good subwoofer should play cleanly from around 20Hz up to its crossover, often near 80Hz, without sudden volume drops, buzzing or rattles.