Acoustic Two-Event Split
If Tyler Robinson alone fired a .30-06 from ~120 meters east, professional audio at UVU should tell one coherent supersonic-rifle story. Compiled Canon XA55 analysis in CK_FILE argues instead for two separated acoustic events — a distant muzzle blast and a louder stage/tent event ~46 m from the camera. That split is a central Proof Not Tyler argument: the fatal mechanism may not be the rooftop rifle shot.
Canon XA55 setup
On September 10, 2025, a Canon XA55 broadcast camera reportedly recorded uncompressed four-channel audio at 48,000 samples/second, positioned roughly 46 meters from the tent where Charlie Kirk sat. Phone footage merges events; professional channels preserve timing.
Full technical page: Mic — Canon XA55 Audio.
Three timing peaks (citizen analysis)
| Offset | Event | Interpreted source |
|---|---|---|
| +114 ms | Early high-frequency energy | Supersonic precursor / Mach cone |
| +202 ms | Muzzle blast | Rifle fire ~120 m from camera |
| +321 ms | Loudest low-frequency peak | Stage/tent ~46 m — Charlie's position |
CK_FILE summary:
"A rifle 120 meters away. A detonation at the tent. Two locations."
Why this challenges lone rooftop Tyler
A single Tyler shot should not, in this framing, produce:
- A clear distant rifle signature at +202 ms, and
- A stronger low-frequency tent/stage event at +321 ms
Analysts argue the +321 ms peak is not mere echo but the primary kill mechanism — device, mic charge, or close weapon — while the rooftop shot is misdirection, unrelated fire, or staged audio.
Proximity sound claims
Separate ProjectConstitu threads cite sound-signature analysis placing a shooter within ~36 feet of one recorder — incompatible with 120 m rooftop Tyler if that analysis holds.
Witness alignment
MuppetMasher witness Nick describes pops and fireworks-class sounds, not a large-calibre rifle boom — see Witness Conflicts.
Limits
Audio analysis depends on source file authenticity, microphone placement, and analyst methods. No court has adopted the two-event model. It remains a hypothesis strengthened by professional multichannel recording claims.