Free hardware tester
Subwoofer Test: Low Frequency Tones Online
Runs locally in your browser. Nothing is uploaded.
Web Audio tone controls
Generate a local tone, select its waveform and channel, and stop it instantly.
This is an uncalibrated output and routing tool, not a hearing test. Browser, device, amplifier, speaker, and room response all affect what reaches you.
Last updated: July 29, 2026
Subwoofer test: This subwoofer test provides controlled low-frequency tones for checking output, crossover handoff, obvious rattles, and channel routing without downloading an audio file.
How this subwoofer test works
Start at very low volume near 50 Hz. Move slowly through the subwoofer’s expected range, then toward the crossover point. Stop immediately if the driver makes mechanical noise or the amplifier clips.
How to read the results
Output should remain controlled through the supported range and blend near the crossover. Room modes can make one frequency boom and another vanish. The browser does not know acoustic sound pressure or driver excursion.
Common causes of failed tests
No subwoofer output can result from an inactive LFE path, crossover, standby threshold, receiver mode, wrong cable, phase cancellation, or source routing. Buzzing can be a ground loop; rattling may be furniture or driver damage.
Troubleshooting before you replace hardware
Confirm power and input, increase source volume only enough to wake auto-standby, check crossover and phase, reseat the cable, and compare a known source. Keep test levels conservative.
For setup and buying context, see the tone generator, left/right speaker test, audio channel test, bass test, subwoofer test, and DTMF tone generator.
Frequently asked questions
What frequency should I use?
About 50 Hz is a practical starting point for a powered subwoofer at low volume.
Why does the subwoofer turn off?
Auto-standby may not detect a very low input level.
Can this measure maximum output?
No. It is not calibrated and should not be used for maximum-output testing.