PHIXER for club system mono check: PA fold and disappearing bass before release
Club and festival PAs often sum low end or run near-mono paths. Kick thump and bass body that feel huge in headphones can disappear on the dancefloor. Practical habit: true L+R sum on the master or USB path, then polarity and timing, then residual frequency-aware phase rotation only if a stereo bed must stay stereo. Check with free PHIXER before release, not only after a soft drop. It is not a club limiter, not a DJ EQ, and not a substitute for a real mono listen on the system bus.
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 a PA processor, not a time-aligner, not a stereo widener, and not a substitute for polarity, delay matching, or a true mono check before the dancefloor. Use it after hygiene, when residual spectral cancellation remains on a stereo bed you must keep stereo. Check before release.
Club PA mono fold failure modes (disappearing bass)
- PA mono-sum before the dancefloor. Kick softens, bass thins, stereo FX mush when the system folds. Habit: true L+R sum on the master or USB stick path before release.
- DJ edit / club edit cousin. Same mono-fold story on booth fold, USB sticks, and phone checks. Cousin guide: Phase-checking DJ edits and club edits before release.
- Remix / stem pack cousin. Contest stems and DJ edit packs that hollow on club systems. Cousin guide: Phase-check remix contest stems and DJ edit packs.
- Vinyl cut cousin. Same groove-friendly mono / bass-fold habit before lacquer. Cousin: PHIXER for Vinyl Cut / lacquer mono prep.
Fast club / PA mono audition (about 60 seconds)
- Sum L+R on the master, USB export, or monitor controller mono. Listen to kick body, bass fundamental, and vocal mid. Do not mute one side to "hear the problem."
- A/B stereo vs mono. Note what disappears on fold: kick thump, sub, wide FX.
- Mute wide FX / Haas / side-heavy verbs briefly. Note which path thins the floor.
- Confirm on a phone speaker or single earbud, then again after any limiter / clipper pass.
- Only then audition residual L/R spectral fights with PHIXER if the stereo bed must stay stereo. Prove any change with mono A/B before release.
Honest order of fixes (before spectral phase rotation)
1. True mono listen on the system / USB path
Hard L+R sum. Habit cousins: DJ edits / club mono and mono check workflow.
2. Polarity if a path flips
Kick layers, bass DI+amp, dual FX returns. Flip Ø when body returns. Guide: polarity invert vs continuous phase rotation.
3. Timing / delay-align before spectral tools
Nudge layered kicks, samples, and dual-path bass a few ms. Spectral rotation is not a substitute for timing.
4. Prefer correlated lows for the floor
Keep critical low-mid correlated. Put width in sides that survive fold. Related: vinyl cut prep (same groove-friendly mono habit) and remix stem QC.
5. Only then residual frequency-aware phase rotation
If a stereo bed must stay stereo and fold still hollows a band after the steps above, gentle rotation can help. Check with PHIXER before release. Prove it with mono A/B. Watch the YouTube tutorial and intro.
Club / PA path types
| Setup | Common mono failure | First fix |
|---|---|---|
| Club PA near-mono lows | Kick soft, bass disappears on floor | True mono listen before bounce / release |
| USB stick / CDJ export | Fine in DAW, soft in booth | Export check on mono / phone |
| DJ edit / club edit | Headphones huge, system thin | DJ edit QC; mono A/B |
| Remix / stem pack | Contest stems cancel on PA fold | Remix stem phase check |
| Haas / wide FX under kick | Drop mush on sum | Less width in lows; mono A/B |
| Vinyl cut of the club master | Bass fold scoop before lacquer | Vinyl cut mono prep |
| Phone / Instagram clip | Huge in booth, gone on phone | Phone speaker check before delivery |
When not to reach for PHIXER
- Wrong polarity on one path (flip Ø first).
- Obvious attack misalignment (nudge first).
- You only need a mono-safe center print for the PA, not a stereo bus.
- Feedback, gain, or PA tuning problems (wrong tool).
- Honesty list: When not to use PHIXER.
Related guides
- PHIXER for TV dialog / broadcast fold: mono fold and dialog intelligibility vs music beds
- PHIXER for Radio broadcast mono fold / mono sum and phase cancellation
- PHIXER for Vinyl Cut / lacquer mono prep (bass fold and phase before cut)
- Phase-checking DJ edits and club edits before release
- Phase-check remix contest stems and DJ edit packs
- PHIXER for DJs / club PA mono fold USB stick phone check
- PHIXER for Mono Compatibility Checklist
- When not to use PHIXER
- Hub
- Product
- Gumroad download
- YouTube tutorial · YouTube intro