Free online audio test
Check left and right sound, balance, phase, and separation on headphones or speakers without uploading audio.
Start at low volume. No audio leaves your device.
Put on your headphones, lower the volume, then start the test.
Play a hidden direction, then choose where you heard it.
Speaker, stereo system, and soundbar tests work best from a centered listening position.
Select headphones, speakers, a stereo system, TV or soundbar, or a gaming headset.
Play Left, Right, and Both, or use Start Stereo Test for a guided channel check.
Compare balance, separation, stereo and mono, phase, and the frequency presets.
Use the problem guide below to repeat the right test before changing permanent settings.
The Left, Both, and Right controls above provide a quick left right sound test without installing software. A correct left right test sends Left only to the left output, Right only to the right output, and Both to a stable position in the center.
This audio test checks left and right routing from the browser to the final earcup or speaker. Use it as a left right audio test after changing cables, audio interfaces, drivers, Bluetooth devices, or system sound settings.
On headphones, the named side should be direct and easy to identify while the unused side stays quiet. With speakers, both ears naturally hear sound through the room, but only the named cabinet should produce the tone. Both should create a clear phantom center between the two speakers.
If Left and Right are swapped, check headphone orientation, detachable cable labels, speaker wiring, and software output mapping. If both channel buttons sound centered, turn off mono audio, crossfeed, spatial audio, and virtual surround. If both channels come from one ear or speaker, compare another source before replacing hardware.
Windows sound utilities, DAC or audio-interface routing, virtual mixers, and gaming software can remap outputs. A loose plug or incompatible adapter can also combine channels. Bluetooth earbuds may change to a call profile when their microphone is active, so close microphone-using apps and reconnect before testing again.
Stereo playback can place sounds at different positions between the two channels. Mono sends the same signal to both channels, so it should sound centered. The left-to-right sweep makes that movement continuous and is useful when single channel tones feel too abrupt.
For two speakers, the in-phase tone should usually create a firmer center and stronger bass than the out-of-phase tone. Headphones may make the out-of-phase version feel unusually wide or less stable. Room reflections and soundbar processing can reduce the contrast.
The same signal can behave differently in sealed headphones, a two-speaker room, or a processed soundbar. Start with channels, then use the check that matches what you heard.
Headphones make hard-panned channels easy to identify. Check orientation, cable labels, earcup seal, and system balance before judging the driver. Gaming headsets may also add virtual surround, so run the first pass with it disabled.
Run the full headphone testSit the same distance from both speakers. Confirm which cabinet plays, then compare the phantom center and phase controls. If one side is near a wall, room gain can make it sound louder even when the electrical levels match.
Open the speaker testA centered tone should not pull strongly to either side. Keep the page slider and system balance centered for the first check. If the offset remains, reverse the headphones or swap speaker connections to see whether the problem follows the hardware.
Try the blind balance testAt 100 percent separation, Left and Right should be clearly distinct. Move the control toward zero to hear the stereo image narrow. If every setting sounds centered, check mono accessibility settings, crossfeed, spatial audio, Bluetooth call mode, and soundbar virtualization.
Retest stereo separationUse the presets to check bass, midrange, and treble at low volume. For an exact tone or a complete 20 Hz to 20 kHz sweep, use the dedicated generator.
Open the frequency testRepeat the smallest relevant test before changing cables, channel assignments, or accessibility settings.
Center both balance controls, reseat the connection, and compare fit or speaker distance.
Check center balanceCheck orientation, detachable cable markings, speaker wiring, and software output mapping.
Retest the channelsDisable mono audio and reconnect the plug or adapter before comparing the two formats.
Compare stereo and monoSet separation to 100 percent and turn off crossfeed, spatial processing, and Bluetooth call mode.
Run the separation testTry another source, then inspect the plug, cable, speaker wiring, or the silent driver.
Repeat Left and RightUse a clear stereo source, compare stereo with mono, then try headphones if speakers or a soundbar still sound similar.
Repeat the format test