Overview
All acoustic treatment panels, bass traps, and QRD diffusers for the MediaVerse Studio Complex are fabricated on-site using readily available materials. This guide covers the construction method for each treatment type, from frame building through fabric wrapping and mounting. All treatments must be installed before commissioning tests (Phase 10).
Prerequisites: All room construction complete (Phases 1–9). Walls finished and painted. Ceiling tiles installed. French cleat mounting positions marked on walls.
Quantities Summary
Production Schedule
Treatment Counts by Type
| Type | Needed | Order / Build | Buffer |
|---|---|---|---|
| Absorption panels (1200 × 600 mm) | 31 | 38 | 4 spares + 10% waste |
| Bass traps (floor-to-ceiling, 300 mm) | 14 | 14 | No spare |
| QRD diffusers (800 × 800 mm) | 4 | 4 | No spare (custom build) |
Distribution by Room
| Room | Panels | Bass Traps | QRD | Notes |
|---|---|---|---|---|
| VO Live (B304) | 8 | 4 | 0 | + motorized curtain (not DIY) |
| Control Room (B311) | 2 | 4 | 2 | First-reflection panels on side walls [AC] |
| Video Studio (B312-1) | 13 | 4 | 2 | 2 additional panels added per ISM simulation verification |
| Editing Suite (B312-2) | 4 | 2 | 0 | REQUIRED — RT60 fails without them [AC] |
| Spares | 4 | 0 | 0 | Stored for future replacement |
| TOTAL ABSORPTION | 31 | 14 | 4 | 27 required + 4 spares = 31 absorption panels |
Panel count logic: 27 required (8 VO + 2 CR + 13 ST + 4 ED) + 4 spares = 31 absorption panels + 4 QRD diffusers = 35 total panels. Order 38 (35 + 10% waste buffer).
Absorption Panels (Build 38)
Standard Absorption Panel
Finished Dimensions
| Parameter | Value |
|---|---|
| Outer frame size | 1200 × 600 mm |
| Frame depth | 50 mm |
| Frame material | 25 × 50 mm pine or poplar |
| Core | Rockwool RWA45, 50 mm thick |
| Core fitting | Friction-fit into frame (no adhesive needed) |
| Fabric | Acoustically transparent, Class A fire-rated |
| Mounting | French cleat system |
Frame Construction
- Cut 25 × 50 mm lumber to length: 2× 1200 mm rails + 2× 550 mm stiles (600 − 2×25 = 550)
- Assemble with butt joints — glue + 2× screws per corner (pre-drill to prevent splitting)
- Check frame is square: measure diagonals, must match within 2 mm
- Sand all edges smooth (120 grit) — any sharp edges will push through fabric
Core Installation
- Cut Rockwool RWA45 to 1195 × 595 mm (5 mm undersize for easy fit)
- Use a sharp utility knife and straight edge — score and snap for clean cuts
- Friction-fit into frame — the slight compression holds the panel in place
- If panel is loose, add a strip of scrap wood behind as a retainer
Handling Rockwool: Always wear gloves, long sleeves, and a dust mask when cutting mineral wool. Work outdoors or in a well-ventilated area. Fibers are an irritant.
Fabric Wrapping
- Cut fabric to 1400 × 800 mm (100 mm wrap allowance on each side)
- Lay fabric face-down on clean surface, place panel face-down on fabric
- Pull fabric taut over one long edge, staple to rear of frame every 50 mm
- Pull opposite long edge taut, staple — fabric should be smooth with no wrinkles
- Fold short edges: hospital corners (like wrapping a gift), staple to rear
- Trim excess fabric
Fabric test: Hold fabric up to a bright light and blow through it. If you can feel air pass easily, it is acoustically transparent. If light is significantly blocked, the fabric is too dense and will reflect sound instead of allowing it to pass through to the absorber. [AC]
Do NOT: Use adhesive on the front face of the fabric — it can block pores and reduce acoustic transparency. Do NOT use canvas, denim, or other tightly woven fabrics. Do NOT stretch fabric so tight it compresses the Rockwool — moderate tension only.
Mounting: French Cleat System
- Cut aluminum or plywood cleat strip: 500 mm long, rip at 45° bevel
- Screw one half to the rear of the panel frame (bevel pointing down and out)
- Screw the mating half to the wall (bevel pointing up and out), level
- Hang panel by hooking the two beveled edges together
- Panel should hang flush and level, easy to remove for inspection or replacement
Bass Traps (Build 14)
Corner Bass Trap
Specifications
| Parameter | Value |
|---|---|
| Core material | Rockwool RWA45, 150 mm thick |
| Height | Floor-to-ceiling: 275 cm |
| Width (corner placement) | 300 mm across each wall face |
| Frame | L-shaped pine bracket, secured to wall studs |
| Fabric | Same acoustically transparent fabric as absorption panels |
Frame Construction
- Cut 2× vertical 25 × 50 mm pine battens to 275 cm (ceiling height)
- Screw battens to wall studs at 300 mm from corner on each wall face
- Add horizontal cross-members every 90 cm for fabric attachment points
- The battens form an L-shape that holds the Rockwool in the corner
Core Installation
- Stack Rockwool RWA45 150 mm slabs vertically in the corner space
- Start from floor, stack to ceiling — friction-fit between battens and walls
- Ensure no gaps between slabs — stagger joints if using multiple layers
Fabric Wrapping
- Staple fabric to the two vertical battens, wrapping the exposed face of the trap
- Pull taut but not tight enough to compress the Rockwool significantly
- Fold and staple top and bottom edges cleanly
Placement Schedule
| Room | Corners | Count |
|---|---|---|
| VO Live (B304) | All 4 corners | 4 |
| Control Room (B311) | All 4 corners | 4 |
Why 150 mm thickness: Bass traps need significantly more depth than mid/high absorbers to be effective at low frequencies. The 150 mm Rockwool provides useful absorption down to approximately 100 Hz in corner placement, where room modes are strongest. [AC]
Do NOT: Use 50 mm Rockwool for bass traps — it will not absorb below ~500 Hz. Do NOT leave gaps between Rockwool slabs. Do NOT skip any designated corner — untreated corners create uneven bass response.
QRD Diffusers (Build 4)
Quadratic Residue Diffuser (N=7)
Specifications
| Parameter | Value |
|---|---|
| Overall size | 800 × 800 × 120 mm |
| Diffuser order | N = 7 (7-well QRD) |
| Well count | 7 wells per period |
| Divider material | 18 mm MDF |
| Back panel | 18 mm MDF |
| Finish | Paint or fabric-wrap exposed face |
QRD Sequence (N=7)
The quadratic residue sequence for N=7 determines the depth of each well. The sequence is calculated as n² mod 7:
| Well # | n | n² mod 7 | Depth (mm) |
|---|---|---|---|
| 1 | 0 | 0 | 0.0 |
| 2 | 1 | 1 | 17.1 |
| 3 | 2 | 4 | 68.6 |
| 4 | 3 | 2 | 34.3 |
| 5 | 4 | 2 | 34.3 |
| 6 | 5 | 4 | 68.6 |
| 7 | 6 | 1 | 17.1 |
Unit depth = 17.1 mm (depth per sequence unit). Maximum well depth = 4 × 17.1 = 68.6 mm. Total diffuser depth including back panel = 68.6 + 18 (back) + 18 (divider stock extending behind) ≈ 120 mm overall.
Construction Steps
- Cut back panel: 800 × 800 mm from 18 mm MDF
- Cut 8 divider strips: 800 mm tall × 120 mm deep × 18 mm thick (MDF)
- Mark divider positions on back panel: 7 wells, each approximately 97 mm wide (800 ÷ 7 ≈ 114 mm per well, minus 18 mm per divider)
- Glue and pin-nail dividers to back panel at marked positions
- Cut well depth spacers: for each well, cut a block of MDF to the required depth from the sequence table above
- Glue spacer blocks to the back panel inside each well (the spacer fills the well from the back to the correct depth)
- Sand all edges smooth
- Finish: paint with latex paint (any color) or wrap the front face with fabric
Precision matters: QRD performance depends on accurate well depths. Measure and cut spacers carefully. A table saw with a stop block ensures consistent cuts. [AC]
Placement Schedule
| Room | Position | Count |
|---|---|---|
| Control Room (B311) | Rear wall (behind listening position) | 2 |
| Video Studio (B312-1) | South wall, lower center | 2 |
Purpose: QRD diffusers scatter reflected sound evenly across a wide angle rather than absorbing it. In the Control Room, rear-wall diffusers prevent strong late reflections from coloring the stereo image while preserving the room’s sense of space. [AC]
Do NOT: Place diffusers at first-reflection points (use absorption panels there). Do NOT orient diffusers with wells running horizontally — wells must be vertical for proper frequency-dependent scattering. Do NOT paint the inside of wells with thick, textured paint — it changes the effective well depth.
Materials List
Bill of Materials — All Treatments
Rockwool
| Product | Thickness | Quantity | Used For |
|---|---|---|---|
| Rockwool RWA45 | 50 mm | 34 sheets (1200 × 600 mm) | Absorption panels |
| Rockwool RWA45 | 150 mm | ~23.1 m² net face area (14 traps × 0.3 m × 2.75 m × 2 faces) | Bass traps |
Timber
| Material | Dimensions | Quantity | Used For |
|---|---|---|---|
| Pine or poplar | 25 × 50 mm | ~140 m total | Panel frames (38 panels × ~3.5 m each) + bass trap battens |
MDF
| Material | Thickness | Quantity | Used For |
|---|---|---|---|
| MDF board | 18 mm | ~3 sheets (2440 × 1220 mm) | QRD diffuser back panels, dividers, and spacers |
Fabric & Hardware
| Item | Quantity | Notes |
|---|---|---|
| Acoustically transparent fabric, Class A fire-rated | ~35 m² | Panels + bass traps |
| T50 staples (10 mm) | 2 boxes (~5000) | Fabric attachment |
| Wood screws (35 mm) | 1 box (~200) | Frame assembly |
| French cleat strips (aluminum or plywood) | 68 pairs | Panel mounting |
| Wood glue (PVA) | 1 liter | Frame joints |
| Latex paint (for QRD finish) | 1 liter | Optional — or fabric-wrap |
Room Placement Guide
Installation Positions
VO Live (B304) — 8 panels, 4 bass traps
- 4× bass traps: all 4 room corners, floor-to-ceiling [AC]
- 8× absorption panels: distributed on walls at ear height (center of panel at 130 cm AFF)
- + motorized curtain: 450 g/m² velour on ceiling C-rail (not DIY — separate procurement)
Control Room (B311) — 2 panels, 4 bass traps, 2 QRD
- 4× bass traps: all 4 room corners, floor-to-ceiling [AC]
- 2× absorption panels: first-reflection points on left and right side walls [AC]
- 2× QRD diffusers: rear wall (behind listening position), centered vertically [AC]
Finding first-reflection points: Sit at the listening position (1.54 m from front wall). Have an assistant slide a mirror along the side wall at tweeter height. The point where you can see the monitor tweeter in the mirror is the first-reflection point. Mount the absorption panel centered on that point. [AC]
Video Studio (B312-1) — 13 panels, 4 bass traps, 2 QRD
- 13× absorption panels: distributed on north, south, and west walls only — NO panels on east wall (green screen wall)
- 4× bass traps: all 4 room corners, floor-to-ceiling [AC]
- 2× QRD diffusers: south wall, lower center area
Editing Suite (B312-2) — 4 panels, 2 bass traps
- 4× absorption panels: 2 on each long wall at ear height [AC]
- 2× bass traps: south room-end corners, floor-to-ceiling [AC]
Do NOT defer Editing panels: Without these 4 panels, the Editing Suite RT60 = 0.42 s, which FAILS the target. These panels are required for acoustic compliance, not optional. [AC] [HP]
Safety Notes
Workshop Safety
Personal Protective Equipment
- Rockwool handling: Gloves, long sleeves, safety glasses, P2/N95 dust mask
- MDF cutting: P2/N95 dust mask (MDF dust contains formaldehyde resins), safety glasses, ear protection
- Staple gun: Safety glasses, keep fingers clear of staple path
- Power tools: All standard workshop safety practices
Fire Safety
- All fabric must be Class A fire-rated — verify certification before purchase
- Rockwool RWA45 is non-combustible (Euroclass A1) — no fire risk from the core
- MDF is combustible — do not place QRD diffusers near heat sources
- Keep fire extinguisher accessible during fabrication
QC Checklist
Fabrication & Installation Verification
Per-Panel Checks (all 38)
- Frame square: diagonals match within 2 mm
- Rockwool fills frame completely, no gaps at edges
- Fabric taut, no wrinkles or sagging
- Fabric acoustically transparent (light/air test passed) [AC]
- French cleat securely attached to frame and wall
- Panel hangs level and flush to wall
Per-Bass-Trap Checks (all 8)
- 150 mm Rockwool fills corner completely, floor to ceiling [AC]
- No gaps between stacked Rockwool slabs
- Battens secured to wall studs (not just drywall)
- Fabric taut and neatly finished at top and bottom
Per-QRD Checks (all 4)
- Well depths match sequence table within 1 mm [AC]
- All 7 wells clear and unobstructed
- Wells oriented vertically [AC]
- Mounted securely to wall (heavy — use appropriate anchors)
Installation Totals
- Absorption panels: 31 total (27 required + 4 spares stored) [HP]
- Grand total panels: 35 total (31 absorption + 4 QRD) [HP]
- Total bass traps installed: 14 [HP]
- Total QRD installed: 4 [HP]
- Editing Suite: 4 panels confirmed installed [AC] [HP]
- Control Room: first-reflection panels at mirror-verified positions [AC]
Acceptance: Acoustic treatment installation is accepted when all counts match the schedule, all QC items pass, and the installation is ready for RT60 and NC commissioning tests (Phase 10).