Please go to https://www.audiocheck.net/testtones_sinesweep20-20k.php using Firefox or Chrome in Windows. Place your phone at a distance ~1m the laptop. Make sure neither the laptop nor the phone can move even a single millimetre during the experiment. Start recording, record 2-3 seconds of silence, then play the log sweep, then when it finishes stop recording. Then, without moving the laptop or the phone (very... - Source: Reddit / about 2 months ago
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