GEARCHECK LABInspect the input channel count reported by the browser and compare two local level meters. The test requests stereo when available, with processing preferences disabled where the device supports those requests.
Relative digital levels, not calibrated dB SPL. No microphone recording is created.
Channel count comes from the active audio track settings when reported. A mono source can have one channel even when the Web Audio graph exposes multiple outputs. The meters show relative digital RMS level, expressed as dBFS, and are not calibrated sound-pressure readings. Similar levels on both sides can come from duplicated mono input, room sound or device processing; they do not prove that the microphone has two independent capsules.
The browser may ignore requested channel count or processing preferences, and some USB interfaces expose a mixed input. Channel labels describe browser channel order rather than a verified physical left/right position. If no signal is visible, check the selected input and system permissions before assuming hardware failure. Audio is routed through a zero-gain output path to avoid audible monitoring. No recording is created by this channel test, and hiding the tab stops capture.
No. A driver may duplicate mono input, and both channels can receive the same room sound. Compare a known stereo source and the reported track settings.
Diagnostic data is processed locally in this tab and is not intentionally sent to analytics. Network tools send only their test probes and temporary payloads to GearCheck Lab’s speed-test server. Media and device access starts only after your explicit action and any required browser permission. Downloaded results stay on your device.
Read the privacy policy and testing methodology. If something fails, report the tool URL and visible message.