Speaker & Headphone Test (Free, Online)
A free tool to test the left/right channels and volume balance of your speakers or headphones, right in your browser. Frequency presets help you spot missing tweeter or woofer bands — handy right after a purchase or when checking for wiring mistakes.
Usage Tips
- If sound only comes from one side, suspect a loose cable connection or a failing speaker. Check the same way with earphones and headphones too.
- Step through the frequency presets from low (around 100Hz) to high (16kHz and above) to spot a speaker that is quiet or silent only in a specific band.
- Start at close to the minimum volume the first time you play a tone, then raise it gradually to protect your speakers and your hearing.
- Use the "Both" channel to check mono playback, and switch between "Left" and "Right" to check for reversed stereo wiring.
Frequently Asked Questions
Side Note — "L," "R," and the History of Stereo Sound
The "L" and "R" labels on audio equipment refer to the speaker on the listener's left and right, respectively. Stereo playback became widespread starting in the 1950s, and its key difference from mono playback (sound from a single speaker) was the ability to reproduce a sense of spread and localization — where a sound appears to come from. Plugging a headphone jack in the wrong way can swap the left and right channels, and a classic way to check for this is a test like this one, which plays each channel separately for comparison.
The human range of hearing is generally said to span about 20Hz to 20,000Hz (20kHz), but the upper limit that people can actually perceive declines with age — many adults find it hard to hear tones above 15kHz. Frequency response varies by product: some speakers or earphones are tuned for strong bass, while others emphasize crisp treble. Stepping through several frequencies lets you get a rough sense of your own hearing range and which bands your equipment handles well or poorly.
Beyond the single-frequency sine wave used by this tool, audio equipment checks and calibration also commonly use "white noise" (which contains all frequencies at equal energy) and "pink noise" (which carries more energy at lower frequencies). White and pink noise are well suited to checking a speaker's overall frequency response at once, while a sine wave is better when you want to isolate and check one specific frequency. Choosing between them depending on the purpose is a basic technique used by audio engineers.