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Pro audio test
Frequency Response Mapper
Plays a 20Hz–20kHz sweep through your speaker, records it back, and charts the frequency response live.
Hold your phone 20–30 cm away. We'll sweep 20 Hz → 20 kHz for 10 seconds and capture the response.
Ready — allow microphone access and keep speaker volume around 70%.
20 Hz200 Hz2 kHz20 kHz
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