Video 15 — recorded on a Canon XA55 professional broadcast camcorder with 4-channel 48kHz/16-bit uncompressed PCM audio. The highest-quality acoustic record from September 10, 2025. No lossy compression. No codec artifacts. No temporal smearing. Raw physics, captured at professional grade.
Canon XA55 serial 552309400183, positioned at 40°16′39.24″N 111°42′48.55″W. The file metadata confirms identical create and modify timestamps (2025:09:10 03:35:05 UTC) — no post-recording editing. Four independent mono tracks: CH1 on external XLR shotgun microphone, CH2–CH4 on the built-in microphone array. Uncompressed PCM eliminates every artifact concern that applies to phone recordings.
| Parameter | Value |
|---|---|
| Device | Canon XA55 Professional Camcorder |
| Serial Number | 552309400183 |
| Audio Format | PCM uncompressed, 48,000 Hz, 16-bit |
| Channels | 4 independent mono tracks |
| CH1 | External shotgun microphone (XLR input) |
| CH2–CH4 | Built-in microphone array |
| Video | H.264/AVC, 1920×1080, 23.976fps, 38 Mbps |
| GPS Position | 40°16′39.24″N 111°42′48.55″W |
| Metadata | Original — no re-encoding detected |
CH1 (shotgun) saturated with 122,844 clipped samples — the event was on-axis with its directional pickup. CH2–CH4 (built-in omnidirectional) captured clean waveforms with only 1–12 clipped samples. CH1 shows zero correlation with CH2–CH4 (−0.05), confirming a separate signal path. CH2–CH3 inter-channel correlation of 0.957 with 20.8µs TDOA confirms closely-spaced built-in microphones.
| Channel | Peak | RMS | Clipping | Notes |
|---|---|---|---|---|
| CH1 (Shotgun) | 1.000 | 0.490 | 122,844 samples | Saturated throughout event |
| CH2 (Built-in) | 1.000 | 0.042 | 12 samples | Clean capture, brief clip |
| CH3 (Built-in) | 1.000 | 0.043 | 1 sample | Cleanest channel |
| CH4 (Built-in) | 1.000 | 0.039 | 3 samples | Clean capture |
Bandpass decomposition of CH3 reveals the same descending-frequency arrival order identified in the phone recordings: high-frequency content (>2kHz) arrives first, followed by progressively lower frequencies. This is the signature of a supersonic event (Mach cone) followed by a delayed blast wave — not a single detonation, which would show simultaneous arrival across all frequency bands.
| Band | Onset Δ | Peak Δ | Amplitude |
|---|---|---|---|
| 10–22kHz | −0.0ms | +0.4ms | 0.093 |
| 5–10kHz | +0.1ms | +204ms | 0.289 |
| 2–5kHz | +0.2ms | +0.7ms | 0.898 |
| 800Hz–2kHz | +0.3ms | +146ms | 0.699 |
| 300–800Hz | +1.7ms | +322ms | 0.468 |
| 100–300Hz | +102ms | +326ms | 0.162 |
| 30–100Hz | +12ms | +133ms | 0.009 |
| 4.7–5.2kHz (4940Hz) | +0.7ms | +75ms | 0.074 |
The Canon XA55's intermediate position and professional-grade audio uniquely resolve three separate low-frequency events that phone recordings near the stage blur together. The muzzle blast timing at +202ms places the rifle at approximately 120 meters from the camera — consistent with the 127-meter estimate from the 10-camera analysis within 6% position uncertainty.
| Timing | Amplitude | Identification | Distance Estimate |
|---|---|---|---|
| +114ms | 0.154 | Early LF energy | Mach cone LF component or ground reflection |
| +202ms | 0.085 | Muzzle blast | ~112m from Canon → ~120m from stage |
| +321ms | 0.336 | Stage detonation | ~17m from Canon (strongest LF peak) |
The muzzle blast at +202ms independently confirms a rifle at ~120 meters — within 6% of the 127m estimate from the 10-camera Comprehensive Analysis. The stage detonation at +321ms produces the strongest LF peak, consistent with a near-field energetic event at the tent. These three events are temporally and spatially distinct — they cannot originate from a single source.
The uncompressed 48kHz PCM format preserves high-frequency transient detail that AAC compression in phone recordings destroys. The Canon's shotgun microphone detected 765 sub-200µs zero-crossings — a 6× increase over the best phone recording. Both channels hit the 20.8µs Nyquist floor, indicating supersonic content extends beyond the recordable bandwidth even at professional sample rates.
| Recording | Total ZCs | Sub-200µs | Sub-100µs | Fastest |
|---|---|---|---|---|
| XA55 CH1 (Shotgun) | 869 | 765 | 259 | 20.8µs |
| XA55 CH3 (Built-in) | 674 | 518 | 85 | 20.8µs |
| 7.mp4 Opposite (phone) | ~150 | 123 | N/A | 22.7µs |
| 3-1 Front (phone) | ~30 | 15 | N/A | 45.4µs |
| IMG_6368 Side (phone) | ~5 | 2 | N/A | 90.7µs |
The Canon XA55 provides the strongest supersonic evidence of any recording from the event. The 6× increase in N-wave detections over phone recordings eliminates any possibility that these signatures are codec artifacts — they are preserved in uncompressed PCM with full bandwidth. Both the shotgun and built-in microphones independently detect supersonic content at the Nyquist sampling limit.
The Canon XA55 (Video 15) is the highest-quality audio source from the September 10, 2025 incident: 4-channel 48kHz uncompressed PCM with original metadata confirming authenticity. It constitutes an 11th independent recording confirming the findings of the 10-camera Comprehensive Forensic Analysis.
The two-phase event structure (supersonic crack followed by delayed blast) is independently confirmed by descending-frequency bandpass arrival order: 10–22kHz arrives at Δ+0ms, 100–300Hz arrives at Δ+103ms.
Three separate low-frequency events are resolved for the first time: early LF at +114ms, muzzle blast at +202ms (rifle at ~120m, consistent with the 10-camera estimate of 127m), and stage detonation at +321ms.
N-wave supersonic signatures are the strongest of any recording: 765 sub-200µs zero-crossings on the shotgun and 518 on the built-in microphones, exceeding all phone recordings by 4–6×.
The 4940Hz Strouhal tone onset is simultaneous with the Mach cone (+0.5ms), confirming co-location of the supersonic impact and the vortex-shedding source at the van/tent area.
The shotgun microphone's saturation (122,844 clipped samples) with zero correlation to the built-in microphones confirms directional energy on-axis with the shotgun's pickup pattern.
The Canon XA55 analysis independently corroborates every major finding of the Comprehensive Forensic Analysis from a geometrically unique position, using professional-grade uncompressed audio that eliminates all concerns about lossy codec artifacts. This recording provides the strongest single piece of acoustic evidence supporting the multi-source event hypothesis.
18-second extracts (10:00–10:18) from each of the four independent channels. 48kHz/16-bit uncompressed PCM WAV. Verify every claim in this analysis yourself.
External directional microphone. 122,844 clipped samples — event on-axis.
Download WAV →