Podcast Audio Cleanup: How to Make Your Podcast Sound Professional
The podcast market is more competitive than ever — over 4 million shows are registered on Spotify alone. In that environment, audio quality isn't just a nice-to-have. It's a core part of your show's identity.
Listeners will forgive a lot — awkward pauses, off-topic tangents, occasional stumbles. They will not forgive background noise, echo, or inconsistent volume. Audio quality issues are consistently cited as the number one reason people stop listening to a podcast.
Whether you're starting fresh or trying to fix an existing show with audio issues, this guide covers everything you need to know about podcast audio cleanup: what the problems are, how to fix them yourself, and when it makes more sense to hand the work to professionals.
The Most Common Podcast Audio Problems
Before diving into solutions, it helps to name the specific problems clearly:
Background Noise
The most common complaint. Sources include:
- Air conditioning and heating systems (the most frequent culprit)
- Computer fans — especially on laptop mics
- Refrigerator hum from nearby kitchens
- Street traffic from open windows
- Electrical hum from ungrounded equipment (often 50/60Hz)
- Keyboard and mouse noise from the host or remote guests
Room Echo and Reverb
Recording in untreated rooms creates a hollow, distant sound. This happens because sound bounces off hard surfaces (walls, ceilings, floors, desks) and reaches the microphone a fraction of a second after the direct voice does. The result is a "bathroom" or "cave" quality that makes voices hard to understand.
Inconsistent Levels
Common in interview or multi-host shows where guests use different microphones, are at different distances, or have different vocal volume habits. One host is too loud, the other too quiet. Guests recorded remotely on phones or laptops are quieter than hosts with proper setups.
Mic Issues
- Plosives: harsh "p," "b," and "t" sounds that create wind bursts into the microphone
- Sibilance: harsh "s" and "sh" sounds that become piercing in playback
- Proximity effect: boomy, bass-heavy sound from speaking too close to a directional mic
- Handling noise: thuds and bumps transmitted through the microphone stand or cable
Remote Guest Audio Problems
One of the hardest challenges in modern podcasting. Your guest is recording on whatever device they have — often a laptop's built-in microphone — in an untreated room, over an internet connection that introduces its own compression artifacts.
The Foundation: Getting Good Audio Before Editing
The most efficient podcast audio cleanup starts before you hit record. A few setup improvements dramatically reduce post-production time:
Microphone position: Place the mic 10–15cm from your mouth, slightly off-axis (angled about 30–45 degrees) to reduce plosives. Don't go further away than 20cm — distance dramatically increases room reflections relative to direct voice.
Acoustic treatment isn't expensive: A heavy curtain behind the mic, a recording in a wardrobe surrounded by hanging clothes, or a movable acoustic panel (you can build one for under $50 with rigid fiberglass insulation and fabric) will do more for your sound than a $500 microphone in a bare room.
Dynamic vs condenser microphones: Condenser mics are sensitive and capture detail — but they also capture everything else in the room. Dynamic microphones (Shure SM7B, Electro-Voice RE20, even the budget-friendly Shure MV7) reject off-axis and background noise significantly better. For podcasters recording in untreated rooms, a dynamic mic is often the smarter choice.
Tell guests to use earbuds: The single most impactful thing you can do for remote guest quality. Earbuds prevent guest audio from bleeding into the microphone from speakers. Even crappy earbuds help. A surprising number of podcasters don't ask their guests to do this.
Podcast Audio Cleanup Tools
Audacity (Free)
The classic free audio editor. For basic podcast cleanup:
- Noise Reduction: Sample a section of pure background noise → Effect → Noise Reduction → Get Noise Profile → then apply across the whole clip. Set reduction to 12–15dB, sensitivity 6–8 — start conservative to avoid artifacts.
- Equalization: Cut below 80Hz (rumble) and around 200–300Hz if the voice sounds muddy. A gentle boost at 3–5kHz improves clarity.
- Compressor: Evens out volume variation. Threshold around -18dB, ratio 2:1 to 3:1 for speech.
- Normalize: Set peak levels to -1dB before exporting.
Limitation: Audacity works fine for controlled recordings. For difficult material — noisy rooms, echo, remote guests on laptop mics — it runs out of tools quickly.
GarageBand (Free, Mac)
For Mac users, GarageBand includes a decent noise gate and some voice processing presets. The Smart Controls for voice channels include compression, noise gate, and EQ. Good starting point for simple cleanups.
Adobe Audition
Part of Creative Cloud. More powerful than Audacity with adaptive noise reduction that continuously adjusts to changing background noise — more effective than Audacity's profile-based approach on variable noise. Includes Spectral Frequency Display for surgical removal of specific noise events.
iZotope RX (The Professional Standard)
iZotope RX is used in professional podcast post-production studios worldwide. Its Dialogue Isolation module uses machine learning to separate speech from background and is dramatically more effective than traditional noise reduction on difficult material.
Key tools for podcast cleanup:
- De-noise: Adaptive, learns the noise floor continuously
- De-reverb: Reduces room echo without artifacts
- De-hum: Removes electrical hum at 50/60Hz and harmonics
- De-click: Removes mouse clicks, pops, and electrical interference
- Dialogue Isolation: AI speech separation — the strongest tool for bad room recordings
RX Elements (entry level) costs around $99. For anyone producing podcasts seriously, it pays for itself quickly.
Descript (Subscription)
Descript takes a different approach — it's an audio/video editor that works from a text transcript. Its Studio Sound feature applies AI-based audio enhancement automatically. Good for creators who want decent audio cleanup without diving into technical details.
Workflow for Professional-Sounding Podcast Audio
Here's the processing chain professional podcast editors use:
1. High-pass filter (80Hz)
Cut everything below 80Hz. Rumble, air handling vibration, traffic — none of it is useful for voice. This one step alone clears up muddy low-end on nearly every recording.
2. Noise reduction
Apply adaptive noise reduction at a conservative setting. Start at 70–80% of maximum. Check for artifacts — if the voice starts sounding underwater or robotic, you've gone too far.
3. De-hum (if needed)
If you hear a constant tonal hum, apply de-hum at 50Hz (Europe) or 60Hz (North America) with harmonics. This removes electrical interference without affecting the voice.
4. De-click (if needed)
For recordings with pops, static, or mouth clicks, apply a light de-click pass before compression.
5. EQ
Gentle sculpting rather than dramatic boosts/cuts:
- Cut around 150–250Hz if the voice sounds boxy
- Boost slightly at 3–5kHz for presence and clarity
- Add a gentle high-shelf boost at 10kHz for air (only if the recording isn't already harsh)
6. Compression
Brings up quieter parts and tames loud transients. For voice, a ratio of 2:1 to 3:1 with a threshold around -18dB works for most voices. Use a fast attack (10ms) and medium release (100–200ms).
7. De-esser (if needed)
For voices with harsh sibilance, add a de-esser targeting 6–9kHz.
8. Loudness normalization
The podcast industry standard is -16 LUFS (mono) or -19 LUFS (stereo). Most podcast hosts recommend -16 LUFS integrated. Use your DAW's loudness normalization or a dedicated plugin (Youlean Loudness Meter is free).
Handling Remote Guest Audio
Remote guests recorded over Zoom, Riverside, Zencastr, or phone calls are the hardest audio to clean up. Here's a realistic assessment:
What can be improved:
- Background noise (AC, traffic, home environment)
- Electrical hum
- Some degree of room echo
- Inconsistent volume (leveling)
What's harder to fix:
- Internet compression artifacts (the "robotic" or "glitchy" quality of a bad connection)
- Severe reverb from recording in a large empty room
- Recordings where the source quality is so degraded that artifacts are dominant
For remote guest audio, iZotope RX's Dialogue Isolation is the most effective tool available. It can separate intelligible speech from surprisingly noisy recordings. But it has limits — if the signal-to-noise ratio is too low, even professional tools struggle.
For consistent results with remote guests, the most reliable approach is to use a recording platform that captures each participant locally (Riverside.fm, SquadCast, Zencastr) rather than recording the compressed Zoom audio.
When to Use a Professional Podcast Audio Cleanup Service
Many podcasters — especially those publishing weekly — reach a point where DIY audio cleanup becomes a bottleneck:
- You're spending 2–3 hours per episode on audio cleanup that should take 30 minutes
- Guest recordings are so problematic that your tools aren't fully fixing them
- You have a backlog of older episodes you want to clean up and republish
- Your show is growing and you need consistent quality across all content
- You're launching a new show and want every episode to sound polished from day one
WefixSound works with podcast producers to clean up audio across individual episodes or ongoing show production. The workflow: you send the raw audio, receive a free 60-second sample showing what cleaned audio sounds like, then approve before any payment. Turnaround is 24 hours.
For podcasters producing multiple episodes per week, bulk pricing is available — the per-episode cost drops significantly at volume.
Technical Specs: Exporting Podcast Audio
Format: MP3 at 128kbps mono (sufficient for voice-only shows) or 192kbps stereo (for shows with music beds or high-fidelity sound design)
Sample rate: 44.1kHz (standard for podcasting)
Loudness: -16 LUFS integrated (mono) is the widely accepted podcast standard
The Compound Effect of Audio Quality
Here's something podcast statistics consistently show: shows with consistently good audio have higher subscriber retention rates and better reviews. Not because listeners explicitly think "this sounds great" — but because listening feels effortless. They're processing the content, not straining to hear through the noise.
That effortless listening translates to longer average episode completion, more five-star reviews, and higher subscriber retention — all of which feed the podcast platform recommendation algorithms.
If you're building a podcast for the long term, audio quality is one of the most leveraged investments you can make.
Have an episode with difficult audio that your current tools can't fix? WefixSound offers a free sample — upload the file, get 60 seconds back clean, and see the difference before committing.
Related articles: How to Make Your Podcast Sound Professional on Any Budget · Audio Denoising Guide for Podcasters · How to Clean Up a Podcast Interview