RT60 Comparison — All Rooms
VO Live
| Frequency | Target | Achieved | Deviation | Status |
|---|---|---|---|---|
| 125 | 0.20s | 0.384s | +0.184s | +0.18 |
| 250 | 0.20s | 0.259s | +0.059s | +0.06 |
| 500 | 0.20s | 0.223s | +0.023s | +0.02 |
| 1k | 0.20s | 0.210s | +0.010s | +0.01 |
| 2k | 0.20s | 0.216s | +0.016s | +0.02 |
| 4k | 0.20s | 0.223s | +0.023s | +0.02 |
Mid-band (500 Hz–1 kHz) RT60 = 0.217s. Bands ≤ 250 Hz sit below the Schroeder frequency (273 Hz) — Sabine over-predicts here; controlled by the 3 corner traps + 3× 125 Hz membranes.
Control
| Frequency | Target | Achieved | Deviation | Status |
|---|---|---|---|---|
| 125 | 0.30s | 0.573s | +0.273s | +0.27 |
| 250 | 0.30s | 0.395s | +0.095s | +0.10 |
| 500 | 0.30s | 0.338s | +0.038s | +0.04 |
| 1k | 0.30s | 0.276s | -0.024s | -0.02 |
| 2k | 0.30s | 0.244s | -0.056s | -0.06 |
| 4k | 0.30s | 0.243s | -0.057s | -0.06 |
Mid-band RT60 = 0.307s (Schroeder 253 Hz). Bass buildup from three coincident modes (~62–67 Hz) is handled by 3 full traps + 1 soffit trap + 3 membranes.
Video/Podcast — HYBRID 4-state
| Frequency | S1 bare cyc | S2/S3 curtains | S4 partial |
|---|---|---|---|
| 125 | 0.558s | 0.560s | 0.559s |
| 250 | 0.392s | 0.324s | 0.340s |
| 500 | 0.338s | 0.252s | 0.272s |
| 1k | 0.326s | 0.232s | 0.253s |
| 2k | 0.331s | 0.229s | 0.251s |
| 4k | 0.339s | 0.233s | 0.256s |
HYBRID mid-band RT60 by state: S1 0.332s (bare cyc — music window 0.325–0.42, chroma + choir/instruments) · S2/S3 0.242s (white/black curtains deployed — speech class, marginally dry, disclosed) · S4 0.262s (partial). 125 Hz ≈0.56s in every state (geometry-driven, disclosed). The S1 250 Hz build-up is cured by 2× BT-08 membranes retuned ~250 Hz (0.405→0.392s). Schroeder shifts with state: S1 140.5 / S2-S3 120.0 / S4 124.9 Hz; 6 deep superchunk traps + deep perimeter soffit carry the low end.
Technical Notes
Eyring Correction
For rooms where average absorption > 0.3 (VO Live, Control), Eyring correction gives more accurate results than Sabine. Both methods are shown in the Main Report.
Why Each Room Has Its Target
VO Live (0.20s target, 0.217s achieved): Voice recording needs minimal coloration.
Control (0.30s target, 0.307s achieved): Mixing requires a neutral monitoring environment.
Video/Podcast (HYBRID 4-state: S1 0.332s · S2/S3 0.242s · S4 0.262s): the room switches between a music-friendly bare-cyc state and dry speech states via the motorised curtains.