PHIXER for Binaural: dummy-head stereo phase and mono fold-down
A binaural / dummy-head stereo capture can feel tall and intimate in headphones: pinna cues, near-ear detail, a solid center whisper or instrument. On phone playback, Bluetooth, club PA mono, livestream fold, or a platform that sums L+R, the middle thins and low-mid body dips while edges stay. Binaural stereo is not Mid/Side encoding, not a Decca Tree, and not a widener. Polarity and a few samples of timing come first. Free phase-repair helps after residual L/R fights remain on a stereo bed you must keep stereo. It is not a binaural decoder, not a HRTF tool, and it does not replace a true mono listen.
Download PHIXER free YouTube tutorial
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 dummy-head aligner, not a polarity button, not a delay matcher, and not a substitute for mono audition after a binaural print. Use it after hygiene, when residual spectral cancellation remains on a stereo bed you must keep stereo.
Three binaural / dummy-head failure modes this page covers
- Dummy-head or in-ear pair with a flipped capsule. One side wired or oriented wrong can hollow the center in fold while stereo still sounds immersive in cans.
- Binaural print into Mid/Side or width tools. Encoding or widening a dummy-head bed can scoop Mid body on phone and club fold. Cousin: PHIXER for Mid-Side.
- Binaural next to Decca Tree, XY/ORTF/A-B, or spot mics. Stacking immersive beds with main arrays or spaced pairs piles more cancellation under fold. Cousins: Decca Tree and Stereo Mic Pair.
Fast binaural mono audition (about 60 seconds)
- Sum L+R with a monitor controller or utility. Do not mute one ear canal to "hear the problem."
- A/B stereo vs mono across a sustained soft source and a transient. Note what disappears: center body, attack, near-field tone, or image that was actually cancellation.
- Confirm neither ear is polarity-flipped by accident. Flip Ø on one channel if body returns immediately. Then nudge a few samples of L vs R attack timing before chasing plugins.
- Confirm on a phone speaker, then again after bus EQ / compressor / reverb send. Re-check after Mid/Side, width, Decca Tree, or mic-pair beds join the bus.
Honest order of fixes (before spectral phase rotation)
1. True mono listen on the binaural print
Hard L+R sum with both ears open. Habit: mono check workflow.
2. Head / capsule geometry before plugins
If mono scoops only when one ear drifts or a mic is swapped, fix the rig first. Geometry mistakes are not free stereo.
3. Polarity before more processing
Flip Ø on one side while mono. Keep the flip that returns body. Guide: polarity vs phase.
4. Attack timing before spectral tools
Nudge a few samples or ms so transient peaks agree across L and R. Often enough on phones and club fold even on dummy-head beds that should already be time-aligned.
5. Skip when intentional thin mono is the point
Some Side-heavy immersive prints are meant to stay edge-only in fold. Honesty list: When not to use PHIXER.
6. Only then audition residual L/R spectral fights
If a stereo binaural bed 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. Watch the YouTube tutorial and the mono demo.
Binaural / dummy-head setups and common mono failures
| Setup | Common mono failure | First fix |
|---|---|---|
| Dummy-head L/R ear capsules | Center body dips; edges stay | Mono listen; check Ø / wiring |
| In-ear / lapel binaural pair | Whisper / near source thins in fold | Polarity; a few samples timing |
| Binaural into M/S or widener | Mid scoops harder in fold | Mid-side use-case |
| Binaural + Decca Tree / XY / ORTF / A-B | Pair middle hollows on phone | Decca Tree / Mic pair |
| One ear wired reverse | Immediate center cancel in mono | Fix wiring; polarity flip |
| Master-bus width after binaural | Streaming / phone fold thins | Mono check master; less width |
Decca Tree, mic pair, and Mid-side cousins (short version)
- Decca Tree / orchestral main arrays share fold surprises with binaural beds when one arm or Side is wrong. Full write-up: PHIXER for Decca Tree.
- Stereo mic pairs (XY, ORTF, A-B) share center cancel on phone and hall fold. Full write-up: PHIXER for Stereo Mic Pair.
- Binaural prints often meet Mid/Side matrices in immersive, ASMR, and ensemble capture. Full write-up: PHIXER for Mid-Side.
- Polarity and attack timing still come first on every cousin. Spectral tools after residual L/R fights only.
When not to reach for PHIXER
- One ear capsule or cable is simply wrong (fix the rig first).
- Wrong polarity on one channel (flip Ø first).
- Obvious attack misalignment (nudge first).
- You only need a mono-safe center print, not a stereo binaural bed.
- Intentional Side-heavy texture that is meant to stay thin in mono.
- Honesty list: When not to use PHIXER.