Guzheng / Chinese zither multi-mic phase: close bridge/body vs room/OH and Chinese ensemble fold
Close spots on the guzheng bridge and paulownia soundboard feel bright and huge in the booth and in cans. On phone speakers or YouTube mono fold, pluck attack, Mid, and sustained course body often thin or cancel against stereo OH and room paths that carry the same phrase a few milliseconds later. Chinese ensemble beds (erhu, dizi, pipa) stack the same problem. That is usually polarity and arrival time between bridge spots and shared beds, plus a stereo bed that was never folded before send. Fix polarity and small delays first. Frequency-aware phase repair belongs only after residual L/R fights remain on stereo beds before mono fold. Distinct from erhu bowed and gayageum Korean zither: this page is about Chinese guzheng / zheng (and Chinese companion beds) alone. Cross-links: erhu, gayageum, dulcimer/zither, shamisen, field, livestream.
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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 compressor, not a widener, and not a substitute for mic placement or mono audition of the stream or mix bus. Polarity and timing first; PHIXER after residual spectral fights.
What guzheng / Chinese zither multi-mic phase failure sounds like
- Bridge attack huge in cans, thin on phones. Close bridge or soundboard spots share the same pluck a few ms apart from stereo OH or room.
- Warm body hollow on YouTube. Spot + stereo bed + room stack cancels Mid when the platform folds.
- Tremolo and sliding portamento present in booth, gone on phone. Hard L/R across bridge and body paths collapse on mono fold.
- Guzheng hero vs erhu / dizi / pipa bed fight. Ensemble beds and zither spots share mid energy without polarity hygiene.
- Fine in headphones, broken for livestream viewers. Same destinations as YouTube / social mono, OBS livestream, erhu, gayageum.
Fast mono audition (about 60 seconds)
- Solo the stream / mix bus (not only booth headphones). Flip a utility to mono.
- A/B guzheng bridge/body spots muted vs open under stereo OH and room. Note what disappears: bridge bite, Mid, tremolo shimmer, sustained course body.
- Solo pairs: bridge vs soundboard, guzheng vs erhu/dizi bed, spot vs OH.
- Check correlation on the delivery bus, then with the full Chinese ensemble bed muted vs open.
Order of operations (before spectral phase rotation)
1. Polarity between bridge spots and shared OH / room
Flip bridge or soundboard spots vs stereo OH, or guzheng vs companion bed, when body or Mid return immediately on a clear pluck. Guide: polarity vs phase. Cousins: erhu, gayageum, dulcimer / zither.
2. Small delay align secondary paths to the hero guzheng image
OH and room often arrive later than close bridge spots. A few samples of delay on the secondary often restores body better than EQ for "more zither."
3. One hero guzheng image to the stream or mix bus
Do not send every bridge, soundboard, room, and OH all hot into the livestream or print. Pick a hero Mid-safe bed (often a focused stereo OH plus selective bridge spot), keep extras muted or low. Parallel stacks are classic thin-guzheng on phone fold. Related: overhead & room.
4. Prefer hero bridge as the tone; quieter color spots
Secondary closes should color proximity and sliding identity, not replace the hero image for the stream mix. If every close sits at full level under a loud OH, mono fold almost always hollows the zither bed.
5. Skip wideners and Haas on guzheng beds before fold
Short-delay width and stereo imagers make booth headphones shimmer and phones hollow. Keep critical low-mid and course body centered for stream and print.
6. Only then audition residual L/R spectral fights
If a stereo 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, rotator bypassed vs engaged.
Path types and typical failure modes
| Path | Common mono failure | First fix |
|---|---|---|
| Bridge spots + stereo OH | Body / Mid cancel on stream | Polarity; delay secondary; quieter secondary |
| Guzheng spot + room / OH | Hollow pluck attack, thin tremolo | Polarity + timing; hero Mid-safe path |
| Guzheng + erhu / dizi / pipa bed | Hero vs companion fight on phone | Polarity + delay; hero image |
| Stereo pair hard L/R across bridge/body | Huge in cans, thin on phone | Center critical lows; simplify width |
| Board / matrix → OBS / YouTube | Fine in booth, hollow for viewers | OBS livestream / YouTube mono |
Studio / livestream checklist (to send)
1. Label bridge vs soundboard vs OH vs room vs companion bed
Name bridge, soundboard, erhu/dizi, stereo OH, and room so operators know what hits the livestream or print. Ambiguous stacks get left open and comb on fold.
2. Mono-check delivery bus alone, then with full Chinese ensemble bed
Solo bridge body and Mid in mono. Then open tremolo and course sustain in mono. Note fights between secondary color and hero bed.
3. Watch phone, YouTube, and social destinations
Most remote viewers hear mono or near-mono. Guides: YouTube / social mono, OBS livestream, TikTok / Reels / Shorts.
4. Re-check after stand / seating / bridge-angle moves
Instrument angle and mic height change distance and bleed. Flip polarity again after you move stands, change OH height, or re-seat the player.
When PHIXER helps
- The material is already stereo and must stay stereo (stereo OH, stereo room or board print), not a mono close you fake-widened.
- Polarity, delay align, and hero-path levels are cleaned up, but fold still hollows a band of the spectrum.
- You can A/B mono with the plugin bypassed and hear clearer body or Mid without wrecking the image.
- You are not using it to "fix" unaligned bridge+OH under room, or to replace a time-align edit on the matrix.
Decision table
| You notice… | First try | Why |
|---|---|---|
| Body thins when OH opens under bridge spots | Polarity; delay secondary; quieter secondary | Arrival-time fight |
| Guzheng + erhu/dizi harsh and hollow | Polarity; timing; hero Mid-safe path | Dual-path spot + companion |
| Fine in booth, thin on phone | Mono delivery bus; pull extras | Booth ≠ viewer fold |
| Stereo bed still cancels by band | PHIXER on that stereo bed | Residual spectral L/R fight |
| Mono guzheng alone is dull | Tone / EQ / gain / mic choice | Not an L/R repair job |
When NOT to use PHIXER here
- You have not mono-auditioned the stream / mix bus yet.
- The fix is obviously polarity, delay, one hero image, or quieter secondary under bridge/OH.
- You want PHIXER to make the guzheng louder, wider, or "more zither." Wrong job.
- The path is mono and the print problem is balance or EQ.
- See also when not to use PHIXER.
Quick path: Solo delivery bus in mono → polarity bridge spots vs OH/room → delay-align secondary → one hero image → quieter extras under hero → skip Haas/imagers → mono-check with full Chinese ensemble bed → PHIXER only for leftover stereo cancellation on a stereo bed → fold again for stream / studio print.
Related guides
- Erhu / Chinese bowed multi-mic phase
- Gayageum / Korean zither multi-mic phase
- Hammered dulcimer / mountain dulcimer / zither multi-mic phase
- Shamisen / Japanese lute multi-mic phase
- Field recording / dual recorder outdoor phase
- Polarity vs phase rotation
- When not to use PHIXER
- YouTube / social mono fold checklist
- Twitch / OBS livestream mono fold
Watch
- PHIXER tutorial + how it sounds (walkthrough with audio examples)