Bad audio will make viewers click away faster than almost any other video problem. Even if your visuals are great, muffled sound, background noise, and echo will make your video feel unprofessional.
The good news is that most common audio problems are easy to fix with the built-in tools in Filmora 15. In this guide, we show you how to fix the four most common audio issues, step by step.
For more tips on getting the most out of Filmora 15, check out our full review and feature breakdown.
Common Audio Problems & How to Fix Them
1. Remove Background Noise (Hiss, Fan Hum, Room Tone)
This is the most common audio issue, especially if you record with a built-in laptop microphone or in a room with echo.
How to fix it with AI Denoise:
- Select your audio clip on the timeline.
- Open the Audio panel on the right side.
- Find the AI Denoise option and toggle it on.
- Choose the type of noise you want to remove:
- Hum Removal: For low-frequency hum from fans, air conditioners, and electrical noise
- Hiss Removal: For high-frequency hiss from cheap microphones
- Full Denoise: For general mixed background noise
- Adjust the strength slider. Start at 50% and increase slowly. Too much denoising will make your voice sound muffled and artificial.
Pro tip: For best results, record 5 seconds of quiet room tone at the start of your recording. This gives the AI a clean sample of the background noise.
2. Make Your Voice Louder & Clearer
If your voiceover is quiet or sounds flat, you can enhance it without just turning up the volume (which also makes background noise louder).
How to use Voice Enhancement:
- Select your voice clip.
- In the Audio panel, toggle on Voice Enhancement.
- This tool automatically boosts clarity, evens out volume levels, and makes speech sound more professional.
- For fine control, use the Equalizer to boost mid-range frequencies slightly (around 1–3 kHz) — this is where human speech lives, and boosting it makes voices sound much clearer.
3. Fix Volume Inconsistency
If some parts of your audio are loud and others are quiet, manually adjusting volume with keyframes takes forever.
How to use Normalize & Auto Ducking:
- Normalize: Right-click your audio clip and select Normalize. Filmora will automatically adjust the overall volume to a consistent level.
- Audio Ducking: If you have background music under voiceover, select the music clip and enable Audio Ducking. Filmora will automatically lower the music volume whenever there is speech, so your voice is always easy to hear.
4. Reduce Echo & Reverb
If you recorded in an empty room with hard walls, your audio will probably have an echoey, hollow sound.
How to reduce echo:
- Apply AI Denoise first to remove general room noise.
- Use the equalizer to slightly reduce low-mid frequencies (around 200–500 Hz), where echo is most noticeable.
- Add a small amount of compression to even out the sound.
Note: Heavy echo is very hard to fix completely in editing. It is always better to record in a room with soft surfaces (carpets, curtains, blankets) in the first place.
General Audio Tips for Better Results
- Fix audio before you edit video: Clean up your audio first, then build your video around it.
- Do not overprocess: Too much denoise and enhancement makes audio sound robotic and unnatural. Subtle adjustments always sound better.
- Wear headphones while editing: You will hear problems that laptop speakers will not show you.
- Record at the right level: Try to keep your recording volume peaking around -12dB. If you record too quiet, you will add noise when you turn it up. If you record too loud, it will clip and distort.
Final Thoughts
You do not need expensive audio plugins to get clean, professional-sounding voiceover. The built-in tools in Filmora 15 can fix 90% of common audio problems in just a few clicks.
Good audio makes a bigger difference to perceived quality than almost any visual effect — it is worth spending five extra minutes on every project.
To learn more about Filmora 15’s audio and editing tools, read our complete feature review.