Overview
Acoustic Doors
4 (D1–D4)
Observation Window
1 (OW-1)
Highest STC
D1 — STC 50
Sound Lock
Buffer spine + D2/D3
Door Schedule
| ID | Location | STC | Size (cm) | Weight | Wall |
|---|---|---|---|---|---|
| D1 | South wall, x=434cm | 50 | 90 × 220 | ~75 kg | Wall 4 (STC 50) |
| D2 | Buffer west face | 45 | 90 × 220 | ~60 kg | Wall 5 (STC 55) |
| D3 | VO/Control partition | 45 | 80 × 220 | ~55 kg | Wall 6 (STC 53) |
| D4 | Studio/Editing partition | 48 | 90 × 220 | ~65 kg | Wall 7 (STC 48) |
Per-Door Hardware
| Component | D1 | D2 | D3 | D4 |
|---|---|---|---|---|
| Frame gauge | 16ga steel | 18ga steel | 18ga steel | 18ga steel |
| Frame corners | Welded, sand/lead-filled | |||
| Hinges | 4× heavy-duty SS | 3× heavy-duty SS | 3× heavy-duty SS | 3× heavy-duty SS |
| Hinge rating | 100 kg minimum rated | |||
| Perimeter seal | Magnetic compression seal, continuous, all 4 sides | |||
| Drop seal | Automatic acoustic drop seal (threshold), activates on close | |||
| Neoprene gasket | Perimeter backup seal | |||
| Head gap | 20mm sealant bed | 18mm | 18mm | 18mm |
Door Leaf Construction (All Doors)
Asymmetric layered construction for maximum STC performance:
Outside →
Steel outer ........... 1.2mm
Butyl rubber .......... 1.5mm
MDF ................... 15mm
Rockwool RWA45 ........ 50mm core
MDF ................... 15mm
Butyl rubber .......... 1.5mm
Steel inner ........... 0.8mm (asymmetric)
← Inside
Steel outer ........... 1.2mm
Butyl rubber .......... 1.5mm
MDF ................... 15mm
Rockwool RWA45 ........ 50mm core
MDF ................... 15mm
Butyl rubber .......... 1.5mm
Steel inner ........... 0.8mm (asymmetric)
← Inside
Asymmetric design: Different steel thicknesses (1.2mm outer vs 0.8mm inner) prevent coincidence — both faces resonate at different frequencies, improving broadband STC.
Observation Window OW-1
Size
80 × 50 cm
Sill height
100cm AFF
STC
50
Tilt
5° (prevents flutter echo)
Frame
Welded steel, rubber-isolated from wall
Seal
EPDM compression, desiccant in air gaps
Position
VO/Control partition (W6), x=47.7
Partition Y
241.1
Triple-Pane Construction
Glass ................. 6mm
Air gap ............... 100mm
Laminated glass ....... 10mm
Air gap ............... 75mm
Glass ................. 8mm
Air gap ............... 100mm
Laminated glass ....... 10mm
Air gap ............... 75mm
Glass ................. 8mm
Asymmetric air gaps: 100mm + 75mm prevents coincidence resonance between panes. Different glass thicknesses (6/10/8mm) further decouple resonant frequencies.
Sound Lock Concept
The buffer spine (W5, STC 55) combined with D2 (STC 45) and D3 (STC 45) creates an acoustic airlock between Control Room and VO Live.
Effective isolation when both doors closed: ~90 dB total
This is why the buffer spine exists — it's not just a corridor wall, it's the core of the isolation strategy between the two most critical rooms.
Maintenance Checklist
| Check | Frequency | Method |
|---|---|---|
| Seal inspection (all 4 sides) | Every 6 months | Visual + light test (no visible light through closed door) |
| Drop seal function | Every 6 months | Close door, verify seal drops and contacts threshold |
| Hinge torque | Annually | Check for sag, tighten if needed |
| Magnetic seal contact | Every 6 months | Paper test — paper should not slide through when door closed |
| Window seal (OW-1) | Annually | Visual inspection of EPDM compression |