Overview
This schedule defines the complete hardware specification for each of the four acoustic doors in the MediaVerse studio complex. All hardware selections are driven by STC requirements and operational needs.
| Component | D1 (Entry) | D2 (Control) | D3 (VO Live) | D4 (Studio) |
|---|---|---|---|---|
| STC Rating | STC 50 | STC 45 | STC 45 | STC 48 |
| Size | 90 × 220 cm | 90 × 220 cm | 80 × 220 cm | 90 × 220 cm |
| Frame gauge | 16 ga steel | 18 ga steel | 18 ga steel | 16 ga steel |
| Hinges | 4× heavy-duty | 3× heavy-duty | 3× heavy-duty | 3× heavy-duty |
| Head/jamb seal | Magnetic + compression | Neoprene compression | Neoprene compression | Magnetic + compression |
| Threshold | Auto drop seal + weather strip | Auto drop seal | Auto drop seal | Auto drop seal |
| Lock | Lever + mortise lock | Lever + passage set | Lever + passage set | Lever + passage set |
| Closer | Concealed overhead, adjustable | Surface mounted | Surface mounted | Concealed overhead |
| Special | Weather stripping (exterior) | — | — | Green Glue in leaf |
D1 — Entry Door
Door D1 — STC 50
Exterior Entry Door
D1 is the primary entry from the building corridor into the studio complex. As an exterior-facing acoustic door, it requires additional weather protection beyond standard acoustic seals. [AC]
Specification
| Parameter | Value |
|---|---|
| STC rating | STC 50 |
| Leaf size | 90 × 220 cm |
| Frame | 16 ga steel, welded corners, grout-filled |
| Hinges | 4× heavy-duty ball-bearing (120 kg rated each) |
| Perimeter seal | Magnetic strip + compression neoprene gasket [AC] |
| Threshold | Auto drop seal + weather strip gasket [AC] |
| Lock | Lever handle + mortise lock (keyed entry) |
| Closer | Concealed overhead, adjustable closing speed |
Additional Weather Protection
- Weather stripping: Continuous weather strip on all four edges (in addition to acoustic seals) [AC]
- Rain deflector: Aluminium drip bar at door head to prevent water ingress into seal channel
- Threshold gasket: Rubber threshold gasket below drop seal for secondary weather barrier
4 hinges required: D1 is the heaviest door in the complex and is the most frequently operated. Four hinges distribute the weight and reduce long-term hinge sag that would compromise seal contact.
Closer adjustment: Set closing speed to 3–5 seconds from 90° to latch. Faster closing can damage seals; slower closing leaves the door ajar during high-traffic periods. [HP]
D2 — Control Room Door
Door D2 — STC 45
Buffer Spine to Control Room
D2 connects the buffer spine corridor to the Control Room B311. It swings west into the Control Room. [AC]
Specification
| Parameter | Value |
|---|---|
| STC rating | STC 45 |
| Leaf size | 90 × 220 cm |
| Frame | 18 ga steel, welded corners, grout-filled |
| Hinges | 3× heavy-duty ball-bearing (100 kg rated each) |
| Perimeter seal | Neoprene compression gasket (D-profile, continuous) [AC] |
| Threshold | Auto drop seal [AC] |
| Lock | Lever handle + passage set (no key) |
| Closer | Surface mounted, adjustable |
Operational Notes
- Magnetic hold-open: Electromagnetic hold-open device for non-recording use — releases on fire alarm or manual button press
- Swing direction: West into Control Room — does not obstruct buffer spine corridor when open
Hold-open protocol: The magnetic hold-open must be released (door closed) during ALL recording sessions. An open acoustic door provides zero isolation regardless of wall STC. [AC]
D3 — VO Live Door
Door D3 — STC 45
Buffer Spine to VO Live Booth
D3 is the smallest door in the complex at 80 cm width. It connects the buffer spine to the VO Live booth B304. Swings north into the VO booth. This door has the tightest seal requirements in the complex because VO Live targets NC-12. [AC]
Specification
| Parameter | Value |
|---|---|
| STC rating | STC 45 |
| Leaf size | 80 × 220 cm |
| Frame | 18 ga steel, welded corners, grout-filled |
| Hinges | 3× heavy-duty ball-bearing (100 kg rated each) |
| Perimeter seal | Neoprene compression gasket (D-profile, continuous) [AC] |
| Threshold | Auto drop seal [AC] |
| Lock | Lever handle + passage set (no key) |
| Closer | Surface mounted, adjustable |
NC-12 Seal Requirements
- Zero tolerance on gaps: VO Live targets NC-12, which means ANY seal gap is audible in recordings [AC]
- Drop seal verification: Must contact threshold across full 80 cm width with zero daylight [HP]
- Compression gasket: Verify positive compression on head and both jambs with feeler gauge (no 0.5 mm gap acceptable) [HP]
Do NOT: Accept D3 installation if ANY gap is detectable around the perimeter. NC-12 is the most demanding noise criterion in the complex — a 1 mm seal gap raises the noise floor above the target. [AC]
D4 — Video Studio Door
Door D4 — STC 48
Buffer Spine to Video Studio
D4 serves the Video Studio B312-1. It is upgraded to STC 48 to match Wall 7 performance and includes Green Glue constrained layer damping in the leaf construction. [AC]
Specification
| Parameter | Value |
|---|---|
| STC rating | STC 48 |
| Leaf size | 90 × 220 cm |
| Frame | 16 ga steel, welded corners, grout-filled |
| Hinges | 3× heavy-duty ball-bearing (100 kg rated each) |
| Perimeter seal | Magnetic strip + compression double seal [AC] |
| Threshold | Auto drop seal [AC] |
| Lock | Lever handle + passage set (no key) |
| Closer | Concealed overhead, adjustable |
Green Glue CLD Construction
- Application: Green Glue applied between the MDF stiffener layers inside the door leaf [AC]
- Coverage: 2 tubes (828 mL each) per m² of MDF surface
- Cure time: 30 days to full damping performance
- Purpose: Converts vibrational energy to heat through constrained layer damping, adding 2–3 STC points over the base STC 45 construction
Wall 7 match: D4 is set into Wall 7 (STC 48). The door must match or exceed the wall STC to avoid creating a weak point in the partition. A lower-rated door would become the dominant flanking path. [AC]
Concealed closer: D4 uses a concealed overhead closer (not surface-mounted) for cleaner aesthetics on the studio side. Verify closer is rated for the door weight (~65 kg). [HP]
Maintenance Schedule
Ongoing
Preventive Maintenance for All Acoustic Doors
| Frequency | Task | Acceptance Criteria |
|---|---|---|
| Annual | Inspect all seals for compression set, cracking, or gaps | No light visible around any edge when door is closed. Replace seals if light is visible. [HP] |
| Annual | Verify drop seal contact with threshold | Full-width contact with threshold plate. Adjust mechanism if gap exists. [HP] |
| Bi-annual | Lubricate hinges; check closer speed | Closer speed: 3–5 seconds from 90° to latch. No hinge binding or squeaking. |
| As needed | Check magnetic seal pull force (D1 and D4 only) | Minimum pull force: >2 kg/m of seal length. [AC] |
Warning: Propping acoustic doors open during recording sessions destroys all isolation. The STC rating of any door drops to effectively STC 0 when held open. Use the magnetic hold-open device on D2 only during non-recording periods. [AC]
Seal replacement schedule: Neoprene compression gaskets should be replaced every 3–5 years, or immediately if annual inspection reveals compression set or visible gaps. Magnetic seal strips have a longer service life (7–10 years) but should be checked for demagnetization.