Verify output routing, one channel at a time.
Generate a clean test tone in the browser to check left, right, and centered playback without downloading a sample file.
Stereo output bench
Ready for a stereo listening test
Play left, right, and both at a low system volume. MeterSee generates the tone locally and asks you to verify the physical output.
Start at low system volume. Each tone stops automatically after three seconds. This test confirms audible routing and stereo separation; it does not measure speaker frequency response or distortion.
Isolate routing before replacing a speaker.
Compare channels at a low, identical volume. A missing channel can come from balance settings, a cable, an interface, or the speaker itself.
Check physical outputs first, then the operating-system balance and channel map.
Play both, reseat the connection, and test headphones on the same output.
Lower both system and test volume; compare another browser and output device.