PHIXER for Blumlein Pair: coincident figure-8 stereo phase
A Blumlein pair (two coincident figure-8 capsules at about 90 degrees) can sound deep and wide in headphones: strong side lobes, clear center, natural room. On phone playback, Bluetooth, club PA mono, livestream fold, or a hall feed that goes LoRo, the middle thins and low-mid body dips while edges stay. Coincident figure-8 stereo is not Mid/Side encoding, not a spaced pair, 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 Blumlein decoder, not a polar-pattern fixer, 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 coincident-pair alignment tool, not a polarity button, not a delay matcher, and not a substitute for mono audition after a Blumlein print. Use it after hygiene, when residual spectral cancellation remains on a stereo bed you must keep stereo.
Three Blumlein / coincident figure-8 failure modes this page covers
- Crossed figure-8s with a flipped or swapped lobe. One capsule wired or oriented wrong can hollow the center in fold while stereo still sounds wide in cans.
- Blumlein print into Mid/Side or width tools. Encoding or widening a coincident figure-8 bed can scoop Mid body on phone and club fold. Cousin: PHIXER for Mid-Side.
- Blumlein next to OH / room or other pairs. Stacking coincident figure-8s with overheads, rooms, or spaced pairs piles more cancellation under fold. Cousins: Stereo Mic Pair and OH / Room.
Fast Blumlein mono audition (about 60 seconds)
- Sum L+R with a monitor controller or utility. Do not mute one figure-8 to "hear the problem."
- A/B stereo vs mono across a sustained note and a transient. Note what disappears: center body, attack, hall tone, or image that was actually cancellation.
- Confirm capsule angle (about 90 degrees), front/back lobe orientation, and that neither channel 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, OH / room, or other mic-pair beds join the bus.
Honest order of fixes (before spectral phase rotation)
1. True mono listen on the Blumlein print
Hard L+R sum with both figure-8s open. Habit: mono check workflow.
2. Capsule angle and lobe orientation before plugins
If mono scoops only when one lobe faces the wrong way or the angle drifts far from 90 degrees, fix the rig first. Pattern mistakes are not free stereo.
3. Polarity before more processing
Flip Ø on one channel 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 coincident pairs that should already be time-aligned.
5. Skip when intentional thin mono is the point
Some Side-heavy Blumlein 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 Blumlein 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.
Blumlein setups and common mono failures
| Setup | Common mono failure | First fix |
|---|---|---|
| Two figure-8s at ~90 degrees | Center body dips; edges stay | Mono listen; check lobe / Ø |
| Blumlein into M/S or widener | Mid scoops harder in fold | Mid-side use-case |
| Blumlein + XY / ORTF / A-B | Pair middle hollows on phone | Mic pair use-case |
| Blumlein + OH / room bed | Overhead body scoops under close mics | OH / room use-case |
| One capsule wired reverse | Immediate center cancel in mono | Fix wiring; polarity flip |
| Master-bus width after Blumlein | Streaming / phone fold thins | Mono check master; less width |
Mic pair, Mid-side, and OH / room cousins (short version)
- Other stereo mic pairs (XY, ORTF, A-B) share fold surprises with Blumlein. Full write-up: PHIXER for Stereo Mic Pair.
- Blumlein prints often meet Mid/Side matrices in classical, jazz, and ensemble capture. Full write-up: PHIXER for Mid-Side.
- Overheads and rooms can pile more cancellation under a coincident figure-8 bed. Full write-up: PHIXER for OH / Room.
- 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 figure-8 lobe 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 Mid print, not a stereo Blumlein bed.
- Intentional Side-heavy texture that is meant to stay thin in mono.
- Honesty list: When not to use PHIXER.