Speaker Channel Test
Free Left & Right Audio Tester
How to Use This Tool
Plug in wired stereo headphones before running the test. In Vocals Sound mode (default), a directional ping plays in the selected channel first — then a voice announces which speaker is active. The ping is the real channel test; the voice labels it. Switch to Sine Tone or White Noise for a continuous tone routed through the correct channel.
Use Auto to alternate between channels automatically every few seconds — useful for comparing both sides without clicking.
Interpreting Your Results
Both channels producing clear, equal sound means your stereo system is working. A quieter channel usually points to an OS audio balance slider being off — check system settings before assuming damage. A completely silent channel means physical speaker damage, a driver fault, or a blocked grille. Muffled sound even at full volume is typically water or dust inside the chamber — run the SpeakerCure cleaning tool to address it.
Speaker passed but still sounds muffled?
Water or dust inside the speaker chamber is the most common cause. SpeakerCure uses 165–300 Hz acoustic sweeps to clear it — free, no download.
Run the Free Speaker Cleaner →Frequently Asked Questions
How does the voice know which speaker to use?
The voice announcement is a pre-recorded audio file played through the Web Audio API ChannelMergerNode — the same routing as the ping. Both the beep and the voice are sent exclusively to the correct left or right channel.
What does the ping confirm?
The short beep routes through the Web Audio ChannelMergerNode with explicit left or right channel assignment. If you hear it in the correct ear, that speaker is working.
Why is one speaker completely silent?
A silent channel typically means physical speaker damage, a software audio driver fault, or debris blocking the speaker aperture. Before assuming the speaker is broken, use the SpeakerCure cleaning tool to rule out water or dust obstruction.
Does this work on phones?
Yes. Use wired stereo headphones for meaningful left/right results. Most smartphones route both audio channels through a single speaker without headphones, so both channels will sound identical — this is normal hardware behavior.