PHIXER for YouTube Loudness / mono check before upload
YouTube loudness and phone mono fold can thin a mix that sounded huge in headphones. A stereo bed that survives your DAW can soft-drop bass and side detail when the player downmixes or a phone speaker sums L+R. Phase check with PHIXER before upload, after polarity and timing. It is not a YouTube loudness meter, not a limiter, and not a substitute for a true mono / phone listen.
Download PHIXER free YouTube tutorial YouTube intro
PHIXER is free stereo phase-repair (VST3/CLAP/AU · Win/Mac/Linux) from Riverflux Audio. Frequency-aware phase rotation for leftover L/R fights on stereo material. It is not YouTube Studio, not a loudness normalizer, not a time-aligner, not a stereo widener, and not a substitute for polarity, delay matching, or a real mono / phone check. Use it after hygiene, when residual spectral cancellation remains on a stereo bounce you must keep through YouTube downmix and phone playback.
Three YouTube loudness / mono collapse modes
- Phone / single-speaker downmix after upload. Viewers often hear one earbud or a phone speaker. A mix that sounds huge in headphones can soft-drop low-end punch and side beds when the path sums. Habit: true L+R sum on the master bounce before you encode. Cousin: PHIXER for YouTube / Social Video Mono Fold.
- Loudness pass vs phase. YouTube loudness can change perceived balance, but hollow bass after fold is usually phase or polarity, not LUFS alone. Fix fold first, then loudness. Cousin: Spotify / streaming loudness + mono.
- Beds under voice / dialog on Shorts and long-form. Music beds and stings under speech share the same phone-speaker story as podcast and audiobook beds. Cousins: Podcast Music Beds, Audiobook Narration, and TV dialog.
Fast YouTube loudness / mono / phone audition (about 60 seconds)
- Sum L+R on the master / stereo bounce bus. Listen to kick, bass, voice body, and side beds.
- A/B stereo vs mono. Note what disappears on fold: punch, consonants, wide pads under voice.
- Preview the bounce on a phone speaker or one earbud. Mute wide FX / Haas / side-heavy verbs. Note which path thins the fold.
- Re-check fold after any limiter / loudness / encode pass, not only before cleanup. Habit: mono compatibility checklist.
Honest order of fixes (before spectral phase rotation)
1. True mono / L+R listen plus phone preview
Hard L+R sum on the master bounce. Then preview on a phone speaker or one earbud. Habit: mono compatibility checklist, YouTube / social mono, and the 60-second audition above.
2. Polarity if a path flips
Dual mics, stacked beds, dual-path stings. Flip polarity when body returns. Guide: polarity vs phase.
3. Timing / delay-align before spectral tools
Nudge dual mics, stacked takes, and wide beds a few ms. Spectral rotation is not a substitute for timing.
4. Prefer correlated lows and center for phone fold
Keep kick, bass, and critical voice body correlated. Put width in sides that survive fold. Related: Podcast beds and TV dialog.
5. Only then audition residual L/R spectral fights
If a stereo bounce must stay stereo and fold still hollows a band after the steps above, gentle frequency-aware phase rotation can help. Prove it with mono A/B. Phase check with PHIXER before upload. Watch the YouTube tutorial and the mono demo.
YouTube loudness / mono path types
| Setup | Common mono failure | First fix |
|---|---|---|
| Music video / long-form master | Bass and punch soft-drop on phone | Hard mono bounce; phone speaker check |
| Shorts / Reels / TikTok cousin | Bed under voice thins on one earbud | True L+R with bed under a spoken take |
| Wide pad / Haas under the bed | Swish or cancel on fold | Less width in lows; correlated center |
| Dual-path / stacked bed takes | Body gone when both play | Polarity then timing |
| Limiter / loudness / encode after mix | Fine in headphones, thin after upload | Re-check fold after limiter / encode / upload, not only before |
| Audiobook / podcast / TV cousins | Narration beds / intro stings / dialog beds thin the same way | Audiobook · Podcast beds · TV dialog |
Audiobook, podcast, and TV cousins (short version)
- Audiobook narration beds, podcast music beds under voice, and TV dialog vs music beds share the same L+R habit as YouTube loudness / mono before upload.
- Polarity and timing still come first. Spectral tools after residual L/R fights only.
- Full write-ups: PHIXER for Audiobook Narration, PHIXER for Podcast Music Beds, and PHIXER for TV dialog / broadcast fold.
When not to reach for PHIXER
- Wrong polarity on dual mics or stacked beds (flip polarity first).
- Obvious attack misalignment (nudge first).
- You only need a mono print, not a stereo bounce that must survive phone fold.
- YouTube loudness / LUFS / limiter problems alone (wrong tool).
- Noise gate / denoise / speech-cleanup problems (wrong tool).
- Honesty list: When not to use PHIXER.
Related guides
- PHIXER for Audiobook Narration / music beds mono/phone playback
- PHIXER for Podcast Music Beds / intro sting stereo that collapses on phone mono
- PHIXER for TV dialog / broadcast fold: mono fold and dialog intelligibility vs music beds
- PHIXER for YouTube / Social Video Mono Fold and phone speaker phase
- Spotify / streaming loudness + mono compatibility
- PHIXER for Mono Compatibility Checklist
- Mono demo
- When not
- Hub
- Product
- Gumroad download
- YouTube tutorial
- YouTube intro