Recording
How to Fix a Recording That's Too Quiet (and Avoid It Next Time)
A quiet recording is frustrating: listeners max out their volume, then get blasted by the next notification. The good news is that quiet audio is one of the easiest problems to fix, as long as you understand what boosting can and can't do.
Why recordings end up quiet
- Distance: every doubling of the distance from the microphone drops the level by roughly 6 dB. A phone on the table across a meeting room records far quieter than one in your hand.
- Conservative input gain: recorders and interfaces set low to avoid distortion, which is sensible, but leaves the file quiet.
- Automatic gain control in some apps reacting to a loud moment and staying turned down.
- Very dynamic content: a single loud laugh or slammed door sets the peak, so the speech around it looks quiet by comparison.
Step 1: Look before you boost
Open the file in the Volume Booster. It shows the current peak level in dBFS. If the peak is at −20 dB, there's 19 dB of space before you reach a safe −1 dB ceiling. If it's already near 0 dB but still sounds quiet, a few loud spikes are the problem, and you'll need the limiter (step 3).
Step 2: Normalize
Press Normalize to −1 dB. The whole recording is raised by the same amount until its loudest moment sits just below the ceiling. Nothing else changes: the balance between quiet and loud parts stays exactly as recorded. For many recordings, this is all you need.
Step 3: Boost further with the limiter
If normalizing isn't enough, increase the gain a few more decibels with Prevent clipping with a limiter turned on. The look-ahead limiter catches the short peaks that would otherwise exceed the ceiling, turning them down for a few milliseconds while everything else gets louder.
| Extra boost past normalize | Typical result |
|---|---|
| +3 dB | Clearly louder, usually transparent |
| +6 dB | Much louder; loud moments start to feel controlled |
| +10 dB or more | Very dense; can sound flat or "pumping" on music |
What boosting can't fix
- Background noise: hiss, hum and room noise get louder by exactly the same amount as the voice.
- Distance and echo: a voice recorded far away sounds roomy; making it louder keeps it roomy.
- Clipping already in the file: if the original distorted, boosting makes the distortion louder too.
If the voice is buried in noise, the most effective fix is to re-record closer to the microphone in a quieter room. When that's impossible, dedicated noise-reduction software can help before you boost.
Finishing touches
- Trim first: remove handling noise at the start and end with the Audio Trimmer, so a bump doesn't become the peak that limits your boost.
- Make it shareable: export long recordings at a sensible size with the Audio Compressor (for speech, mono 64 kbps).
Record at the right level next time
- Get close: 10–20 cm from the microphone for speech.
- Set the input gain so normal speaking peaks around −12 dBFS and loud moments stay below −6 dBFS.
- Do a test recording of your loudest expected moment, such as a laugh, before you start.
- Turn off automatic gain if your app offers the option, for consistent levels.
- Record 24-bit if you can. It keeps quiet recordings clean when boosted later.
Frequently asked questions
How do I make a quiet audio file louder without distortion?
Normalize it to −1 dB first, then add extra gain with a limiter switched on so peaks can't clip.
Why does my boosted recording sound noisy?
Boosting raises everything, including background noise. The noise was already there; it was just quieter.
Can I fix audio that already distorted?
Not really. Clipping removes part of the waveform. Specialist declipping tools can soften it, but re-recording is usually the only full fix.