How to test
- Lower your device volume before starting.
- Choose Left / Right, Music, Delay, Spatial or Generator.
- Raise volume gradually and stop immediately if the sound is uncomfortable.
Free, local and zero install
Headphone and speaker sound test
Check channel orientation, stereo movement, music playback, perceived response delay and frequency coverage with five focused listening tools.
Test sounds are generated or played locally. Jemdo does not listen through your microphone or upload audio.
Loading local tester
What it checks
- Left and right channel check
- Reference music samples
- Perceived delay exercise
- Stereo spatial panning
- Frequency and duration generator
Frequently asked questions
Can a browser measure true headphone latency?
Not without a physical loopback path. The Delay test estimates your sound-to-tap reaction after a cue and clearly labels it as a subjective measurement.
Is the frequency generator safe?
It starts at a conservative level and limits the available range. Keep volume low, avoid prolonged tones and stop if you feel discomfort.