Dobro / resonator / lap-slide multi-mic phase: cone vs body, pickup, room, and OH fold
Close mics on dobro, tricone, biscuit, or spider-bridge resonators feel bright and metallic in the booth and on stage wedges. On studio mono fold or livestream, body, Mid, and slide attack often thin or cancel against body/soundhole, pickup, room, and OH paths that carry the same stroke a few milliseconds later. That is usually polarity and arrival time between cone and secondary paths, 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 a full bluegrass string-band stack: this page is about resonator / lap-slide instruments alone. Cross-links: pedal steel, banjo, bluegrass, acoustic guitar.
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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 dobro / resonator / lap-slide phase failure sounds like
- Cone shimmer huge in cans, tinny on phones. Coverplate close and body or pickup share the same stroke a few ms apart.
- Body and fundamental thin on livestream. Cone + body + room/OH stack cancels Mid when the platform folds.
- Pickup blend harsh and hollow. Acoustic close vs piezo or internal mic without polarity and timing hygiene.
- Slide attack present in booth, gone on phone. Hard L/R resonator beds or wide board dumps collapse on mono fold.
- Fine on stage wedges, broken for remote viewers. Same destinations as live FOH / foldback, OBS livestream, bluegrass string-band.
Fast mono audition (about 60 seconds)
- Solo the stream / mix bus (not only booth headphones). Flip a utility to mono.
- A/B cone close muted vs open under body, pickup, room, and OH. Note what disappears: body, Mid, attack, metallic sustain.
- Solo pairs: cone vs body, acoustic vs pickup, stereo bed vs mono fold.
- Check correlation on the delivery bus, then with the resonator muted vs full.
Order of operations (before spectral phase rotation)
1. Polarity between cone / coverplate and body / pickup / room
Flip cone vs body, or acoustic close vs pickup, when body or Mid return immediately on a clear slide attack. Guide: polarity vs phase. Cousins: pedal steel, acoustic guitar, banjo.
2. Small delay align secondary paths to the hero cone image
Body, soundhole, and pickup often arrive later (or earlier after digital hops) than the coverplate close. A few samples of delay on the secondary often restores body better than EQ for "more metal."
3. One hero dobro / resonator image to the stream or mix bus
Do not send cone, body, pickup, room, and OH all hot into the livestream or print. Pick a hero Mid-safe close (often cone or a focused cone+body blend), keep extras muted or low. Parallel stacks are classic tinny-resonator on phone fold. Related: overhead & room.
4. Prefer hero cone as the tone; quieter color body or room
Secondary closes should color wood warmth and proximity, 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 cone.
5. Skip wideners and Haas on resonator beds before fold
Short-delay width and stereo imagers make booth headphones shimmer and phones hollow. Keep critical low-mid and cone 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 |
|---|---|---|
| Cone + body / soundhole close | Body / Mid cancel on stream | Polarity; delay secondary; quieter secondary |
| Acoustic close + pickup / DI | Harsh edge, hollow body | Polarity + timing; hero acoustic or blended Mid-safe path |
| Instrument + room / OH | Attack and sustain thin on phone | Polarity + delay; hero image |
| Stereo pair hard L/R | Huge in cans, tinny on phone | Center critical lows; simplify width |
| FOH / matrix → OBS / print | Fine in booth, hollow for viewers | OBS livestream / live FOH |
Studio / livestream checklist (to send)
1. Label cone vs body vs pickup vs room vs OH
Name coverplate, body/soundhole, pickup, room, and OH 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 resonator
Solo body and Mid in mono. Then open attack and metallic sustain in mono. Note fights between secondary color and hero cone.
3. Watch phone, social, and archival destinations
Most remote viewers hear mono or near-mono. Guides: live FOH, OBS livestream, bluegrass string-band.
4. Re-check after roundneck vs squareneck moves
Playing position and mic angle change distance and bleed. Flip polarity again after you move the stand, change coverplate aim, or switch lap vs Spanish-style roundneck.
When PHIXER helps
- The material is already stereo and must stay stereo (stereo pair, 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 cone+body under room, or to replace a time-align edit on the matrix.
Decision table
| You notice… | First try | Why |
|---|---|---|
| Body thins when body mic opens under cone | Polarity; delay secondary; quieter secondary | Arrival-time fight |
| Cone + pickup harsh and hollow | Polarity; timing; hero Mid-safe path | Dual-path acoustic + DI |
| Fine in booth, tinny 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 resonator 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 cone/room.
- You want PHIXER to make the dobro louder, wider, or "more metal." 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 cone vs body/pickup/room → delay-align secondary → one hero image → quieter extras under hero → skip Haas/imagers → mono-check with full resonator → PHIXER only for leftover stereo cancellation on a stereo bed → fold again for stream / studio print.
Related guides
- Pedal steel / country steel multi-mic phase
- Banjo / clawhammer multi-mic phase
- Bluegrass / acoustic string-band multi-mic phase
- Acoustic guitar multi-mic phase
- Mandolin / bouzouki / cittern multi-mic phase
- Overhead & room mic phase
- Polarity vs phase rotation
- When not to use PHIXER
- Twitch / OBS livestream mono fold
- Live FOH / foldback / stream phase
Watch
- PHIXER tutorial + how it sounds (walkthrough with audio examples)