Bass Test Online — Sweep Your Speakers 20 to 200 Hz
Test your speakers online: left / right channel tones, a 20–200 Hz bass sweep and pink noise — all generated in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the speaker test focused on the low end: press the bass sweep button and a sine tone glides from 20 Hz up to 200 Hz over eight seconds through both channels.
Listen for the moment the sound becomes audible — that is roughly the lower limit of your system. Small desktop speakers typically join in somewhere between 80 and 120 Hz, decent bookshelf speakers around 50–60 Hz, and only subwoofers reach meaningfully below 40 Hz. A sweep also makes rattling grilles, buzzing panels and resonating furniture easy to locate.
Keep the volume moderate: pushing small speakers hard at frequencies they cannot reproduce only produces distortion. The sweep is synthesized locally in your browser — when you are done, the full test also offers per-channel tones and pink noise.
Example. The left-channel control plays the selected tone through a stereo panner hard left, and the bass control sweeps from 20 Hz to 200 Hz over 8 seconds.
Limit. The tone frequency is clamped between 100 Hz and 2000 Hz, and the sweep never goes above 200 Hz.