Bill of Materials

BOM — Acoustic Treatment

Acoustic treatment bill of materials: panels, traps, QRD diffusers, and manual curtain. Complete specifications with 10% waste factor.

Treatment Summary

Absorption Panels
27

installed · Order 38 (10% waste)

Corner Bass Traps
12 + 2 clouds

12 corner installed · 2 ceiling clouds · Order 14 traps (2 spare)

125Hz Membrane Traps
6

VO Live 3 · Control Room 3

QRD Diffusers
4
Panels Installed
31

27 absorption + 4 QRD

Manual Curtain
1

VO Live only

Per-Room Breakdown

RoomPanelsCorner Bass TrapsQRD125Hz MembraneNotes
VO Live B30484 (400mm)03+ 1 manual acoustic curtain (south wall, over OW-1 glazing)
Control Room B31123 (400mm) + 1 cloud23[AC] first-reflection panels (E+W); SE corner served by ceiling cloud (D2)
Video Studio B312-1133 (300mm) + 1 cloud20SW corner served by ceiling cloud (D4)
Editing Suite B312-242 (300mm)004 [AC]
TOTALS (installed)27 absorption + 4 QRD = 3112 traps + 2 clouds46Order: 38 absorption (10% waste) · 14 bass traps (2 spare)

[AC] Acoustic Critical — Editing Suite RT60 without panels = 0.42s, failing the 0.36s target. These 4 panels must be installed before commissioning sign-off.

Panel count logic (SSOT v3.7 · 2026-07-27 reconciliation): 27 absorption panels (8 VO + 2 CR + 13 ST + 4 ED) + 4 QRD diffusers = 31 panels installed. Order 38 absorption panels (10% waste buffer). Corner bass traps: 12 installed (VO 4, CR 3, ST 3, ED 2) + 2 ceiling clouds (CR-SE, ST-SW), order 14 traps (2 spare). 125Hz membrane traps: 6 (VO 3 + Control 3) for low-frequency modal control.

Absorption Panel Specification

Core
Rockwool RWA45, 50mm
Size
1200 × 600 mm
Cover
Acoustically transparent fabric (Class A fire rated)
NRC
0.90 at 500Hz
Mounting
French cleat or Z-clip
Removable?
Yes — must be removable for electrical access

Bass Trap Specification

Core
Rockwool RWA45, 150mm
Height
Floor-to-ceiling (275cm)
Width
400mm corner (VO Live + Control Room) · 300mm corner (Video Studio + Editing Suite)
Cover
Same fabric as panels (matching)
NRC
0.95 (corner placement amplifies low-frequency absorption)
Mounting
L-bracket in corner, floor-to-ceiling

125Hz Membrane Trap Specification

Tuned panel (membrane) absorbers for low-frequency modal control in the two smallest rooms. 6 units total — VO Live 3, Control Room 3. Target f0 ≈ 123 Hz (f0 = 600 / √(m·d)). 125Hz is modal below the Schroeder frequency in these rooms; confirm by measurement and add corner depth if residual boom remains.

Construction
4mm plywood face + 100mm sealed air cavity + 50mm RWA45 backing
Size
1200 × 600 mm
Tuned frequency
f0 ≈ 123 Hz
Quantity
6 (VO Live 3 · Control Room 3)
Seal
Fully sealed cavity — airtight perimeter
Mounting
Lower wall band, below absorption panels

QRD Diffuser Specification

Size
800 × 800 × 120 mm
Wells
7-well quadratic residue sequence
Material
MDF or plywood, fabric-wrapped face
Position
Control rear wall (south) + Studio south wall lower-center

Manual Acoustic Curtain (VO Live Only)

Fabric
450 g/m² acoustic velour, double-layered
Width
327 cm (full south wall, over OW-1 glazing)
Height
275 cm (floor to ceiling)
Coverage
~9.0 m²
Drive
Silent Gliss or Integra Sidewinder, pull cord — manual only
Track
Ceiling-mounted manual track
Curtain OPEN (singing mode)
Vinyl floor ambience for vocalist — RT60 0.27s
Curtain CLOSED (VO mode)
Fully absorptive — RT60 0.20s, NC-12
Purpose
VO/singing mode switch. Curtain position controls room character without panel reconfiguration.

Ceiling Clouds

Suspended absorbers compensate for bass trap corners blocked by doors or equipment. Mounted at 245 cm AFF (30 cm below ceiling).

Control Room — SE corner
600 × 300 mm, Rockwool RWA45 50mm, fabric-wrapped
Video Studio — SW corner
1200 × 300 mm, Rockwool RWA45 50mm, fabric-wrapped
Height AFF
245 cm (30 cm below ceiling)
Mounting
Threaded rod + eye bolts from ceiling slab

Material Quantities (with 10% Waste Factor)

MaterialNet QtyOrder Qty (+10%)Unit
Rockwool RWA45 50mm (panels)27 sheets38 sheets1200×600mm (1 sheet per panel, order 38 = 10% waste)
Rockwool RWA45 150mm (corner bass traps)12 lengths14 lengths275cm × 400mm (VO+CR) / 300mm (ST+ED)
Rockwool RWA45 50mm (ceiling clouds)2 units2 unitsCR-SE 600×300mm · ST-SW 1200×300mm
4mm plywood face + 50mm RWA45 (125Hz membrane traps)6 units7 units1200×600mm, 100mm sealed cavity, f0≈123Hz
Acoustically transparent fabric~28 m²~31 m²Roll
French cleats / Z-clips54 pairs76 pairs2 pairs per panel (27 installed × 2 = 54 net · order 38 × 2 = 76)
MDF/plywood (QRD)4 units5 units800×800mm
Acoustic velour (curtain)~9.0 m²~10.0 m²450 g/m², double-layered
Manual curtain track + Sidewinder11327 cm ceiling-mounted track + pull cord

Install Guide

MethodSpacingNotes
French cleat2 cleats per 1200mm panel, 400mm from edgesLevel check before mounting
Z-clip2 clips per panel, 300mm from edgesPreferred for removable access
Corner bass trap L-bracket3 brackets per 275cm trap (top, middle, bottom)Bracket to wall, trap friction-fit into corner