🔊 Bass Test — Subwoofer & Low-Frequency Tester
Use this online bass tester to isolate low frequencies, find rattles, check your subwoofer crossover, or dial in EQ.
Keyboard: 1-0 = freqs, Space = sweep, Esc = stop
Find a repeatable bass problem without chasing volume
The buttons generate sine tones from 20 to 250 Hz. Use individual tones to revisit a suspected rattle; the five-second sweep is a quick scan with a changing level.
A repeatable check
- Start at low system volume with 100 Hz, then try nearby lower frequencies briefly.
- Select a channel before choosing a frequency. Compare L and R at the same setting, or use Both for your normal listening setup.
- If a particular tone produces a rattle, stop, check nearby objects, and repeat more quietly from another position.
What the result suggests
- 20 or 30 Hz is barely audible
- Small speakers often produce little useful output there. Return to a higher tone; increasing volume is not a valid way to establish deep-bass extension.
- Bass is strong at a wall but weak at your seat
- Placement and room interference are influencing the result. Compare a few positions before boosting a weak band with EQ.
What this cannot establish
Stereo bass reaches a subwoofer only if your system routes it there. This is not a dedicated LFE-channel test, and the visual waveform does not measure driver movement or distortion.
💡 What Can You Test With a Bass Test?
Subwoofer Tuning
Fine-tune crossover frequency, phase, and gain. Find the perfect integration between your subwoofer and main speakers for seamless bass.
Room Acoustics
Identify room modes and standing waves in the bass region. Certain frequencies will boom or cancel out depending on room dimensions.
Car Audio
Test your car's subwoofer and door speakers for rattles. Find which interior panels vibrate at specific bass frequencies and dampen them.
Headphone Bass
Check if your headphones can reproduce deep bass cleanly. Many consumer headphones roll off below 50Hz — find where yours drop off.
Music Production
Verify your studio monitors and sub can handle bass-heavy genres. Check for muddiness in the 100–200Hz range before final mixes.
Home Theater
Calibrate your subwoofer for movies. Explosions and soundtracks demand clean, powerful bass down to 20Hz — test if your system delivers.
✨ Why Use Our Bass Test Tool?
🔗 More Audio Testing Tools
Frequently Asked Questions
What is a bass test?
A bass test plays low-frequency tones (typically 10Hz–200Hz) to evaluate subwoofer performance, check for rattles, and assess your system's low-end response. It helps you tune your subwoofer crossover and placement for optimal bass.
How do I know if my subwoofer is working correctly?
Listen for: clean, distortion-free tones at all frequencies; no rattling or buzzing from the enclosure or nearby objects; smooth volume transition as frequency changes. If you hear distortion, your subwoofer may be overdriven or damaged.
What frequency should my subwoofer be set to?
Most home theater subwoofers work best with a crossover at 80Hz — frequencies below go to the sub, above to main speakers. For music, 60–80Hz is common. Use our bass test to find the sweet spot for your room and speakers.
Why does my subwoofer sound boomy at certain frequencies?
Room acoustics cause standing waves that boost certain bass frequencies. Try moving your subwoofer to different positions (the 'subwoofer crawl' method), or use acoustic treatment to tame room modes.
Can I damage my speakers with a bass test?
Always start at low volume and increase gradually. Extremely low frequencies (below 20Hz) at high volume can damage speakers not designed for them. Keep volume moderate and watch for distortion — that's your warning sign. Pair with our frequency sweep for full-range testing.