Bass Test & Subwoofer Test: Low Frequency Tones 10-200 Hz
Overview
Bass Test & Subwoofer Test. The Bass Test plays frequencies from 10Hz to 200Hz through your subwoofer or bass speakers so you can check how low your system actually reaches. Drag the frequency slider to pinpoint a specific tone, set your volume, and click Auto Sweep to run the full bass range and listen for rattles or missing output. Whether you listen to music or play back a song, the online sound test shows how a speaker handles each frequency you can hear.
This Bass Test / Subwoofer Test plays clean test tones as a pure sine wave from 10 to 200 Hz, so you can hear where the sound from your speakers, headphones or subwoofer fades. Start at low volume, since sustained SPL at a low frequency is hard on drivers, and raise the signal slowly. Subwoofer testing this way reveals the lowest note your audio equipment plays cleanly: the real limit of its low frequencies and bass.
How the Bass Test / Subwoofer Test Works
A free online bass test is a low-frequency tone generator: an oscillator creates one sine tone, and the waveform goes out as a plain audio signal. A bass generator holds one pitch in hertz, so any change you hear comes from your system, which makes this testing tool a true low frequency test, and a bass test online a fair way to compare devices. To confirm the left channel and right channel both work on earbuds, the headphone frequency and stereo imaging test plays tones in one ear at a time.
Frequency Presets, Slider and Sweep
- Frequency presets: jump to checkpoints such as 25, 40, 63 and 100 Hz.
- Frequency slider: step one hertz at a time to find where output fades.
- Frequency sweep: glide through the range to catch peaks, dips and rattles.
- Play and Stop: tones fade in and out, and a visualization moves like a subwoofer simulator.
It runs in any browser on desktop, mobile or smartphone with no downloads and beats WAV audio samples or bass test songs: mastered music is not calibrated bass tones, while a frequency simulator is. Start with a quick sub bass test at 30 Hz.
Bass Ranges in a Low Frequency Test: Sub-Bass vs Mid-Bass
The bass ranges split into four bands. Deep sub-bass (10-30 Hz) is felt more than heard: the rumble and tactile vibration in movie theaters, movies and gaming. Deep bass (30-60) carries organ pedals. Mid-bass or upper bass (60-120) gives kick drums and bass guitars their punch and a punchy body. The low-mid band (120-200) adds warmth and fullness to male vocals. Human hearing fades below 30 Hz, so each bass frequency there needs more power to seem as loud. Voice clarity matters in team callouts, and the online gaming headset check lets you hear your headset microphone input level and noise floor in the browser.
Lowest Frequency and Roll-Off by Device
Below each device's limit the output falls away in a roll-off. Bigger drivers and sealed enclosures move more air, improving low-frequency response, low-end and audio quality.
- Laptop speakers and most consumer speakers: fade below 80-100 Hz.
- Budget earbuds and other earbuds: quit near 40-60 Hz.
- Premium headphones and over-ear headphones: often reach 20 Hz.
- A real subwoofer: covers the full frequency range to 20-25 Hz.
Reading Bass Response in a Subwoofer Frequency Sweep
A sweep rarely sounds even because of room acoustics: bass bounces between parallel walls, forming standing waves at predictable points: Once you pair wireless earphones, the bluetooth audio profile and quality test plays tones in the left ear and right ear to show that stereo panning survived the connection.
$$f_n = \frac{n \times c}{2L}$$
Here \(c\) is 343 m/s, \(L\) is room length in metres and \(n\) is the mode number. In a 4.7 m room, \(f_1 = 343 \div 9.4 = 36.5\) Hz, with further modes at 73.0 Hz and 109.5 Hz. Slide from 36.5 to 55: that boom and the dead spots are the room. Reading bass response:
- Uneven response or weak spots: room resonance.
- Rattling: vibrations in nearby objects.
- Output cuts out at one tone: check loose connections.
- Fuzzy tone: distortion, so turn it down.
Speaker Placement, Room Acoustics and the Subwoofer Crawl
Speaker placement decides which modes you excite. A corner adds bass reinforcement from three room boundaries, plus boom. Try the subwoofer crawl: put the sub at your seat, play your first mode, crawl the floor, and move it where bass sounds smoothest, then test your subwoofer again.
A Living-Room Sub Bass Test That Found a Null at the Sofa
I'm setting up a sealed 12-inch sub in a living room 5.23 m long and 3.91 m wide, and the question is simple: does the sofa, centred across the room and 3.10 m from the front wall, get even bass? The answer turned out to be no: at the centre seat, the tone near 44 Hz almost disappears, and the fix is moving the sofa 0.6 m sideways.
First I set the receiver's crossover to 80 Hz, the THX reference point, and keep the volume low. Then I drag the slider from 120 Hz down to 20 Hz in this subwoofer frequency sweep, pausing on each preset. Most tones sound steady. Around 44 Hz the bass thins out to almost nothing, and from a step to either side it comes straight back.
The room explains it. With \(c = 343\) m/s, the length modes land at 32.8, 65.6 and 98.4 Hz, and the width modes at 43.9 Hz and 87.7 Hz. The first width mode has its pressure null exactly at the room's centreline, which is where the sofa sits. To check the ear test, I worked out the relative level of each width mode as the seat moves off-centre:
| Seat offset from centre | 43.9 Hz mode | 87.7 Hz mode |
|---|---|---|
| 0 m | null | 0 dB |
| 0.3 m | -12.4 dB | -1.1 dB |
| 0.6 m | -6.7 dB | -4.9 dB |
| 0.9 m | -3.6 dB | -18.1 dB |
The catch is the last row. Sliding further than you need to fixes 44 Hz but drops a new null onto 87.7 Hz, right at the 80 Hz crossover where the sub and mains overlap, so a mid-bass hole replaces the sub-bass one. That's why I'd stop at 0.6 m, where neither mode falls more than 7 dB.
The length mode at the seat is also weak (32.8 Hz sits about 10.8 dB below its peak at 3.10 m), but no equalizer boost fixes a null: adding gain only pushes the driver harder. Seating and the subwoofer crawl come first, and EQ only cuts peaks. These figures assume hard, parallel walls; an open-plan room smears the modes, so let the bass test at your own seat have the final word.
Subwoofer Testing Tool Uses: Tuning and Calibration
- Headphone testing and speaker calibration: set crossover points so the sub hands off cleanly to the midrange and treble.
- Box tuning frequency: find where enclosure tuning peaks in a ported box.
- Amplifier output: confirm amplifiers deliver clean power before any equalizer change.
- Car audio: an installer or basshead finds panel rattles in a car.
Cut mode peaks with the equalizer, not bass boost, which makes bass muddy and kills clarity. Repeat each bass test subwoofer check or speaker test the same way.
Safe Volume for Bass Test Tones
High volume at sub-bass frequencies can overdrive a cone silently. Keep tones short, take breaks, and quit at any ear fatigue.
Frequently Asked Questions
- What does a bass test do?
- It plays one low sine tone at a time, from 10 to 200 Hz, so you can hear how deep your speakers, headphones or subwoofer reach and how cleanly they play each note.
- How do I test my subwoofer with it?
- Set the volume low, play 80 Hz, then run the 20 to 200 Hz sweep and listen from your seat. Steady output is good; rattles point to loose parts, and sudden drops point to roll-off or a room null.
- Can low tones damage my speakers?
- Yes. Long, loud tones below about 30 Hz can push a driver past its limits. Start quiet, raise the level slowly, and stop at any distortion or rattling.
- Why can't I hear the lowest tones?
- Small speakers and earbuds usually stop between 40 and 100 Hz, and human hearing is far less sensitive below 30 Hz, so very deep tones are often felt rather than heard.
- How low should good headphones go?
- Premium over-ear headphones often reach 20 Hz, while budget earbuds usually fade around 40 to 60 Hz. Clean output at 30 Hz or below is a sign of strong bass response.
- Why is the bass loud at one frequency and weak at another?
- Your room creates standing waves. Each wall-to-wall distance boosts some frequencies and cancels others at your seat, so moving the subwoofer or your seat often matters more than EQ.
- What is the floor finder sweep?
- It starts at 150 Hz and slides down to 10 Hz. The point where the tone fades out is the lowest frequency your setup can reproduce at that volume.