Bass Tone Generator Online — Sub-Bass & Low-Frequency Test Tones
Test your subwoofer, bass guitar, or speaker bass response with our online bass tone generator. Pure, distortion-free low-frequency tones from 20 Hz to 250 Hz — exactly what you need for serious low-end testing.
What is a Bass Tone Generator?
A bass tone generator produces clean, pure low-frequency sine waves in the range where subwoofers and low-end speakers operate — typically 20 Hz to 250 Hz. Because real music rarely contains isolated bass tones, a dedicated generator is essential for testing whether your sub can reproduce specific frequencies without distortion, room resonance, or rattle.
Our tool focuses entirely on the bass range, so the slider gives you fine 1 Hz resolution exactly where you need it — perfect for finding speaker buzz, identifying room modes, and dialing in the perfect sub crossover.
Features
Subwoofer Range
Slider scoped to 20–250 Hz so every Hz matters. No wasted slider real estate.
Pure Sine Bass
No harmonic distortion — just the cleanest possible test tone for honest measurements.
1 Hz Precision
Find the exact frequency where your subwoofer peaks, dips, or starts rattling.
Instant Playback
No latency between adjustment and audio — slide and hear in real time.
Mobile Friendly
Run sweeps directly from your phone while standing at the sub.
Speaker Safe
Smooth fade-in protects voice coils. Always start at low volume below 30 Hz.
Common Uses
Verify your sub plays low without distortion — sweep slowly from 20 Hz upward.
Find out how deep your headphones really go — most cheap models roll off below 40 Hz.
Standard E-string is ~41 Hz; A-string ~55 Hz; D-string ~73 Hz; G-string ~98 Hz.
Slow sweeps reveal frequencies where bass booms or disappears in your listening room.
How to Use
1. Choose Waveform
Pick sine, square, sawtooth, or triangle depending on the tone character you need.
2. Set Frequency
Use the slider or tap a preset to dial the exact frequency you need.
3. Adjust Volume
Start at low volume — pure tones can be louder than they feel.
4. Press Play
Hit Play and the tone keeps playing continuously until stopped.
Frequently Asked Questions
Sub-bass: 20–60 Hz. Bass: 60–250 Hz. Anything above is generally considered low-mid or mid-range. Our generator covers the full bass region from 20 Hz to 250 Hz.
Rattles usually come from a loose enclosure, port resonance, or sympathetic vibration of nearby objects. Sweep slowly with our tool to find the exact rattling frequency, then track down the source.
Most calibration engineers use 30 Hz, 50 Hz, and 80 Hz. 30 Hz tests depth, 50 Hz tests mid-bass output, 80 Hz is the typical home-theatre crossover.
Yes — at high volume. Sub frequencies require very long cone excursions. Bottoming out a driver can permanently damage it. Always start quietly.
Most adults can hear down to about 30 Hz; under 30 Hz is often more felt than heard. A 20 Hz tone played loud on a good sub feels like a deep pressure wave.
Hearing Safety
Pure tones — especially below 40 Hz or above 10 kHz — carry significant energy at high volumes. Start low and protect your hearing and speakers.