PHIXER for OH / Room: overhead and room phase vs close mics
Overheads and rooms can make a kit feel tall in headphones. On phone playback, Bluetooth, club PA mono, or livestream fold, cymbals stay while snare shell, kick weight, and tom body dip. Polarity and a few samples of timing come first. Free phase-repair helps after residual L/R fights remain on a stereo OH / room bed you must keep stereo. It is not a drum replacer, and it does not replace a true mono listen on the bus.
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 polarity button, not a delay matcher, not a widener, and not a substitute for mic placement. Use it after hygiene, when residual spectral cancellation remains on a stereo bed you must keep stereo.
Three OH / room failure modes this page covers
- OH L/R vs close mics. Fine in cans; hollow kit body on phone or club fold while cymbals stay. Deep guide: Overhead and room mic phase.
- Rooms + spots. Room width fights kick / snare / tom close paths on mono sum. Cousins: Snare top/bottom, Kick in/out, Tom fills.
- Drums / tom multi-mic cousin. Same fold shape on kit beds and fills. Guide: Tom multi-mic phase.
Fast OH / room mono audition (about 60 seconds)
- Sum L+R on the drum bus (or monitor controller mono) with OH and rooms open against close mics.
- A/B stereo vs mono across a backbeat and a fill. Note what disappears: snare shell, kick weight, tom body, or attack that was actually cancellation.
- Mute rooms briefly, then mute one OH. Flip Ø on the room (or the OH path that was flipped by habit). Keep the flip that returns body without killing the kit image.
- Nudge a few samples of OH / room attack timing before chasing plugins. Confirm on a phone speaker, then again after bus EQ / compressor / saturation.
Honest order of fixes (before spectral phase rotation)
1. True mono listen on the full kit
Hard L+R sum or monitor mono with OH, rooms, and closes open. Habit: OH / room checklist and mono check workflow.
2. One hero for body
Prefer close mics (or one OH path) for weight and let rooms / the other OH add air without fighting Mid on every hit.
3. Polarity before more processing
Flip Ø on rooms (or the suspect OH) 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 OH, rooms, and closes. Often enough on its own on phones and clubs.
5. Skip when intentional thin kit is the point
Some mixes deliberately thin in mono for cymbal-led kits. Honesty list: When not to use PHIXER.
6. Only then audition residual L/R spectral fights
If a stereo OH / room 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.
OH / room path types
| Setup | Common mono failure | First fix |
|---|---|---|
| Spaced OH L/R | Kit body dips when summed | Polarity + timing; mono listen |
| XY / ORTF OH + rooms | Cymbals stay, shell disappears | One hero body; flip Ø on rooms |
| Stereo kit bus + spots | Backbeat scoops on phone fold | Drums / tom multi-mic |
| Kick in/out under OH | Sub fights OH low end | Kick in/out guide |
| Snare top/bottom under OH | Crack stays, shell hollows | Snare top/bottom use-case |
| Tom fills under OH / rooms | Fill + kit both hollow | Tom fills use-case |
Drums, snare, kick, and toms cousins (short version)
- Tom multi-mic and kit beds share the same fold shape as OH vs closes. Full write-up: Tom multi-mic phase.
- Snare top vs bottom hollows under the same OH bed. Full write-up: PHIXER for Snare Top/Bottom.
- Kick in vs out hollows the same way. Full write-up: PHIXER for Kick In/Out.
- Tom fills around the kit need the same mono habit. Full write-up: PHIXER for Tom Fills.
- Polarity and timing still come first on every cousin. Spectral tools after residual L/R fights only.
When not to reach for PHIXER
- Wrong polarity on a room or one OH (flip Ø first).
- Obvious attack misalignment between OH, rooms, and closes (nudge first).
- You only need one hero OH or a mono-safe print of the kit.
- Intentional thin kit that is meant to stay cymbal-led in mono.
- Honesty list: When not to use PHIXER.