Subwoofer & Bass Test Online
A comprehensive subwoofer and bass testing toolkit for audiophiles and home theater enthusiasts. Generate precise low-frequency tones from 10 to 200 Hz, run configurable frequency sweeps, try six synthesized bass drops, diagnose polarity and crossover issues, and calculate room acoustics modes — all in your browser, no app required.
Test your subwoofer response, detect rattles, and optimize bass with room mode analysis
Polarity Check
Crossover Finder
Rattle Detection
- Set volume to 60–70%
- Play each frequency for 5–10 seconds
- Walk around the room and listen for buzzing
- Identify the source: panels, shelves, windows, decorations
Frequency Response
Port Noise Test
Features
How to Test Your Subwoofer
- Connect Your System. Connect your device to your audio system via cable, Bluetooth, or AirPlay. Phone speakers cannot reproduce deep bass.
- Set Safe Volume. Start at 30–40% volume. Increase gradually — subwoofers can produce extreme pressure at low frequencies.
- Generate Tones. Use the Tone Generator to play specific frequencies. Try 20, 30, 40, 50, 60 Hz presets to check your sub's range.
- Run a Sweep. Switch to Frequency Sweep and run a 10–200 Hz sweep. Listen for drops, peaks, or rattles in the response.
- Run Diagnostics. Use Diagnostics for polarity check, crossover identification, rattle detection, and frequency response mapping.
Frequently Asked Questions
Can I test a real subwoofer with this tool?
Yes. Connect your phone or laptop to your audio system via cable, Bluetooth, or AirPlay. The tool generates real low-frequency tones that your subwoofer will reproduce. For frequencies below 30 Hz, ensure your sub is rated for that range.
Why can't I hear anything below 30 Hz?
Most phone and laptop speakers cannot reproduce frequencies below 80–100 Hz. You need a subwoofer or large speakers. Below 20 Hz, sound becomes infrasonic — you feel it more than hear it.
Will this damage my subwoofer?
At normal listening volumes, no. However, playing frequencies below your subwoofer's rated range at high volume can cause over-excursion. Always start at low volume and increase gradually.
What is a room mode?
Room modes are resonant frequencies determined by your room dimensions. At these frequencies, bass builds up or cancels depending on listening position. The Room Modes calculator helps identify these problem frequencies so you can optimize subwoofer placement.
How do I find my crossover frequency?
Use the Crossover Finder in the Diagnostics tab. It sweeps 40–200 Hz slowly. Note where sound disappears or thins out — that is where your main speakers can no longer reproduce bass. Set your receiver crossover 10–20 Hz above that point.
What is polarity and why does it matter?
Polarity refers to the direction the speaker cone moves first. If reversed, bass waves from the subwoofer cancel with your main speakers, causing thin, weak bass. The Polarity Check sends a positive impulse — the cone should push outward first.
