Fix Bad Audio: Noise Removal, Loudness & Audio Repair on Apple Devices
Guides to cleaning up recordings on iPhone, iPad and Mac: removing background noise, hum and buzz, repairing clipping, LUFS loudness targets, and audio file formats.
Most bad audio is not unusable audio. A remote interview with a fridge humming behind it, a voice memo recorded too hot, a lecture captured across a room — these are specific, diagnosable faults, and most of them have a fix that takes minutes rather than a re-record.
This guide covers what actually goes wrong in a recording, what can and cannot be repaired after the fact, and how to get a finished file to the loudness that podcast platforms and listeners expect.
Diagnosing What Is Actually Wrong
Hiss, mains hum, rumble, sibilance and clipping all sound like “bad audio” but need completely different treatment. Identifying the fault first is what separates a clean repair from a file that ends up sounding worse than the original.
Noise, Hum and Buzz Removal
Broadband noise reduction handles hiss and room tone; 50 Hz and 60 Hz hum from mains electricity is a narrowband problem with a narrowband solution. Applying the wrong one leaves the noise in and takes the voice out with it.
Repairing Clipping and Distortion
Clipping cannot be undone — the peaks were never recorded. But mild cases reconstruct well enough to be inaudible, and knowing where the line falls tells you in two minutes whether a recording is salvageable or needs to be re-shot.
LUFS and Loudness Normalization
Podcast platforms expect around -16 LUFS for stereo, and a file that ignores that gets turned down, turned up, or simply sounds amateur next to everything else in the feed. Loudness is measured, not eyeballed on a waveform.
Formats and Where Processing Happens
WAV, AIFF, FLAC, ALAC, MP3 and M4A each make a different trade between size, quality and compatibility. And with sensitive recordings — interviews, medical appointments, legal notes — whether processing happens on your device or on someone’s server is a substantive question, not a technicality.
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