Door & Window Details | MediaVerse Acoustic Study v3

Door Positions

ID	Name	Size (cm)	STC	Position	Swing	Location
D1	Entry	90 × 220	50	(434, 0)	N into Editing	south wall, center-right
D2	Control	90 × 220	45	(213.6, 19.9)	W into Control Room (XScale=-1 in DXF)	buffer wall west face
D3	VO Live	80 × 220	45	(123.6, 241.1)	N into VO Live	VO/Control partition
D4	Video Studio	90 × 220	45	(238.6, 189.4)	N into Video Studio	Editing/Video Studio partition, west end
W1	Observation Window	80 × 50	50	(47.7, 241.1)	—	VO/Control partition

Door Leaf Construction

Total thickness: 85 mm. Mass-damping-mass sandwich.

Layer	Thickness	Purpose
Steel sheet (outer)	1.2 mm	Structural rigidity + mass
Butyl rubber	1.5 mm	Constrained layer damping (CLD)
MDF	15 mm	Mass layer
Rockwool RWA45	50 mm	Absorption core
MDF	15 mm	Mass layer
Butyl rubber	1.5 mm	Constrained layer damping (CLD)
Steel sheet (inner)	0.8 mm	Structural rigidity (lighter inner face)

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

Frame Specifications

STC 50 Frame (D1 Exterior)

Frame	16 ga steel, welded corners, filled with sand/lead sheet
Jamb Depth	140 mm
Threshold	automatic drop seal + neoprene gasket
Seal	magnetic perimeter seal, continuous compression gasket
Hardware	3x ball-bearing hinges, lever handle, surface closer
Notes	D1 exterior — add weather stripping + threshold rain deflector

STC 45 Frame (D2, D3, D4 Interior)

Frame	18 ga steel, welded corners, grout-filled
Jamb Depth	120 mm
Threshold	automatic drop seal
Seal	neoprene perimeter gasket, adjustable
Hardware	3x ball-bearing hinges, lever handle, surface closer
Notes	D2, D3, D4 internal acoustic doors

D4 upgrade (v3.2): Upgraded from STC 40 to STC 45. D4 remains weakest link in Wall 7 assembly (now STC 48) but provides 5 dB headroom vs NC-35 target in Editing Suite.

Observation Window W1

Opening	80 × 50 cm
STC	50
Position	(47.7, 241.1)
Sill Height	100 cm from floor
Tilt	5° (prevents internal reflections)

Glass Panes

Layer 1	6mm float
Layer 2	100mm dry air
Layer 3	10mm laminated
Layer 4	75mm dry air
Layer 5	8mm float

Maintenance Schedule

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 exterior threshold especially
Magnetic seals (D1): 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 90deg 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.