MediaVerse S3 / acoustics5 · Contractor Detail Drawing · Acoustic Design Basis

Door & Window Details

All 3 acoustic doors + observation window. Positions from DXF dimension chains, verified against B302. Seal and threshold details are acoustically critical [AC]. D2 deleted (Rev2) — Control uses external D5.

Doors
D1 / D3 / D5
STC Range
45–50
Widths
80 / 90 cm
Window
OW-1 · STC 50

Door Positions

DXF-verified
IDNameSize (cm)STCPositionSwingLocation
D1Entry90 × 22050(479, 0)Out (S) — exterior egresssouth wall, main entry, opens out
D3VO Live80 × 22045(163.6, 280)N into VO LiveControl ↔ VO partition
D5Control External90 × 22050(90, 0)Out (S) from Controlsouth wall, external entry
OW-1Observation Window80 × 5050(47.7, 280)—Control ↔ VO partition

Door Elevations

Per-Door Front Views

Dedicated elevation view for each acoustic door with door-specific dimensions, STC rating, swing direction, seal spec, and hardware. Each door’s spec sheet lists the differences that matter to the contractor (frame depth, seal type, closer type).

D1 — Main Entry Door

D1 elevation — 90cm wide, STC 50, W4 south wall, main entry Front elevation of door D1: 90 cm wide, 220 cm tall, STC 50, magnetic seal, surface closer, main building entry on south wall W4 D1 · STC 50 · 90 × 220 cm STC 50 90 cm 220 cm W4 · South wall · Swing S — opens OUT (egress)
Size90 × 220 cm
STC50 (highest)
WallW4 (south wall, main entry)
SwingSouth — opens OUT (egress; outside landing + security hinges; 2026-08-05)
Frame16 ga, jamb depth 140 mm
SealMagnetic perimeter + automatic drop seal
CloserSurface-mounted + weather deflector

One of two exterior-grade doors (with D5). Magnetic seal required to achieve STC 50 target.

D3 — VO Live Booth Access Narrowest

D3 elevation — 80cm wide (narrowest), STC 45, W6 VO/Control partition Front elevation of door D3: 80 cm wide, 220 cm tall, STC 45, neoprene seal, into VO Live booth, narrowest door in project D3 · STC 45 · 80 × 220 cm STC 45 80 cm 220 cm W6 · VO/Control partition · Swing N into VO Live
Size80 × 220 cm
STC45
WallW6 (VO/Control partition)
SwingNorth into VO Live booth
Frame18 ga, jamb depth 120 mm
SealNeoprene perimeter + automatic drop seal
CloserSurface-mounted, adjustable

The only 80 cm door in the project. Narrower leaf reduces structural intrusion into the 4.24 m² VO Live booth.

D5 — Control Room External Entry NEW

D5 elevation — 90cm wide, STC 50, south wall, Control Room external entry, opens out Front elevation of door D5: 90 cm wide, 220 cm tall, STC 50, magnetic seal, Control Room external entry on south wall, opens outward D5 · STC 50 · 90 × 220 cm STC 50 90 cm 220 cm South wall · Control external · Opens OUT
Size90 × 220 cm
STC50
WallSouth wall (Control Room external)
SwingOpens OUT (south)
Frame16 ga, jamb depth 140 mm
SealMagnetic perimeter + automatic drop seal
CloserSurface-mounted + weather deflector

New dedicated external entry to the Control Room. Exterior-grade; opens outward. Magnetic seal required for STC 50.

Symbols on all 4 elevations:
  • Purple dashed = magnetic perimeter seal (D1, D5). Green dashed = neoprene perimeter seal (D3).
  • Solid green bar at door bottom = automatic drop seal.
  • Three small rectangles on the hinge-opposite edge = 3-point mortise latch positions.
  • Circle + horizontal line at mid-height = lever handle.
  • All doors: solid mineral core, steel-skinned, self-closing. See Leaf Construction and Hardware sections below.

Cross-Section Anatomy

Plan View

Horizontal plan-view cross-section showing leaf build-up, perimeter seals, frame rebate, and automatic drop seal threshold detail.

Acoustic door cross-section anatomy Horizontal cross-section through an acoustic door showing leaf construction, perimeter seals, frame rebate, and threshold detail Acoustic door — horizontal cross-section (plan view) Applies to D1 / D3 / D5 with varying leaf mass and seal spec per STC target Acoustic wall Acoustic wall Door leaf Leaf build-up (exploded) Steel Damp Mineral core Damp Steel Compression seal (jamb) Frame rebate Threshold detail (section view) FFL Leaf bottom edge Automatic drop seal (retracts when door opens) Threshold plate ~3mm Seal spec varies by STC target: STC 45 = single compression, STC 48-50 = double compression + magnetic assist All doors: solid core, steel-skinned, minimum 44mm leaf thickness, 3-point latch

Door Leaf Construction

85 mm total

Mass-damping-mass sandwich. Asymmetric steel thickness (1.2/0.8mm) prevents coincidence at same frequency.

LayerThicknessPurpose
Steel sheet (outer)1.2 mmStructural rigidity + mass
Butyl rubber1.5 mmConstrained layer damping (CLD)
MDF15 mmMass layer
Rockwool RWA4550 mmAbsorption core
MDF15 mmMass layer
Butyl rubber1.5 mmConstrained layer damping (CLD)
Steel sheet (inner)0.8 mmStructural rigidity (lighter inner face)

Frame Specifications

STC 45–50

STC 50 Frame (D1, D5 Exterior)

Frame16 ga steel, welded corners, filled with sand/lead sheet
Jamb Depth140 mm
Thresholdautomatic drop seal + neoprene gasket
Sealmagnetic perimeter seal, continuous compression gasket
Hardware3x ball-bearing hinges, lever handle, surface closer
NotesD1, D5 exterior — add weather stripping + threshold rain deflector

STC 45 Frame (D3 Interior)

Frame18 ga steel, welded corners, grout-filled
Jamb Depth120 mm
Thresholdautomatic drop seal
Sealneoprene perimeter gasket, adjustable
Hardware3x ball-bearing hinges, lever handle, surface closer
NotesD3 internal acoustic door

Hardware & Acoustic Sealing

Critical [AC]

STC ratings are meaningless without proper sealing hardware. Every acoustic door requires all three seal types:

ComponentSpecificationFunction
Automatic drop sealConcealed mortise, silicone bulb, spring-loadedSeals 3-5mm gap between door bottom and threshold when door closes
Perimeter gasketContinuous magnetic or compression seal, 3-sided (head + both jambs)Maintains airtight contact around the full door perimeter
Threshold transitionAdjustable aluminum saddle with neoprene insertBridges float-floor gap, provides drop-seal landing surface
Door closerConcealed overhead, adjustable closing force and latch speedEnsures door fully closes and seals engage — doors left ajar destroy STC

Observation Window OW-1

STC 50

Specifications

Opening80 × 50 cm
STC50
Position(47.7, 280)
Sill Height110 cm AFF
Tilt5° (prevents internal reflections)

Glass Panes

Layer 16mm float
Layer 2100mm dry air
Layer 310mm laminated
Layer 475mm dry air
Layer 58mm float

Maintenance Schedule

Annual

Inspection interval: Annual (minimum), or after any physical impact.

Seal Checks

  • Perimeter gaskets: check for compression set, cracking, or gaps — replace if any light visible
  • Drop seals: verify full contact with threshold when door closes — adjust or replace mechanism
  • Threshold gaskets: inspect for wear from foot traffic — D1 and D5 exterior thresholds especially
  • Magnetic seals (D1, D5): verify magnetic strip alignment and pull force > 2 kg/m

Closer Checks

  • Door closer: verify latching force pulls door fully into seal contact
  • Hinge pins: lubricate annually — squeaking indicates wear that may cause staff to prop doors open
  • Closing speed: 3-5 seconds from 90° to latch — too fast = slam damage, too slow = left open
Warning: Propping acoustic doors open during sessions destroys all isolation. Consider magnetic hold-open devices that release on studio 'LIVE' signal.