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.

How to Test Your Subwoofer

1
Connect Your System

Connect your device to your audio system via cable, Bluetooth, or AirPlay. Phone speakers cannot reproduce deep bass.

2
Set Safe Volume

Start at 30–40% volume. Increase gradually — subwoofers can produce extreme pressure at low frequencies.

3
Generate Tones

Use the Tone Generator to play specific frequencies. Try 20, 30, 40, 50, 60 Hz presets to check your sub's range.

4
Run a Sweep

Switch to Frequency Sweep and run a 10–200 Hz sweep. Listen for drops, peaks, or rattles in the response.

5
Run Diagnostics

Use Diagnostics for polarity check, crossover identification, rattle detection, and frequency response mapping.

Test your subwoofer response, detect rattles, and optimize bass with room mode analysis

40 Hz
E1
~ oscilloscope ~
40%
40 Hz
Phone speakers cannot reproduce bass below 80–100 Hz. Connect to a subwoofer or external speakers.
Start Hz → End Hz
Duration
Direction
Scale
—
Listen for rattles, buzzes, or distortion at each frequency. These may indicate loose panels, damaged drivers, or enclosure issues.
🥁
Kick Drum
TR-808 style bass hit with pitch decay
📉
Sub Drop
EDM sub-bass dive with soft distortion
🎬
Movie Rumble
Low-frequency cinematic rumble effect
🌍
Earthquake
Random low-frequency seismic pulses
⛈️
Thunder
Deep filtered noise burst with decay
🎵
808 Bassline
Repeating sub-bass note pattern
Polarity Check
Verifies subwoofer wiring. A positive impulse is sent — the cone should push outward first.
Crossover Finder
Slowly sweeps 40–200 Hz. Note where sound disappears or thins out — that is near your crossover point.
—
Rattle Detection
Play specific frequencies to find buzzing or vibrating objects in your room.
  • 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
Rate the perceived loudness at each frequency to map your subwoofer's response curve.
Port Noise Test
For ported (bass-reflex) enclosures. Play a sustained tone at your port tuning frequency and listen for chuffing or wind noise.
Hz
Enter your room dimensions to calculate standing wave resonances below 200 Hz.
Enter dimensions and press Calculate.

Features

Tone generator with 12 presets (20–200 Hz), 4 waveforms, and real-time oscilloscope Frequency sweep with linear/logarithmic modes and 6 synthesized bass drops Five diagnostic tests: polarity, crossover, rattle detection, frequency response, port noise Room mode calculator with axial, tangential, and oblique standing wave analysis

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.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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Who is this tool for?
🎛️ Sound Engineers 🎧 Audiophiles
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