Recording Studio Acoustic Design Guide
Recording studios demand the most stringent acoustic control of any room type. The control room requires an RT60 of 0.2–0.4 seconds with a flat frequency response for accurate monitoring. Background n...
Requirements by Standard
The table below shows acoustic requirements for recording studio spaces across 1 applicable standards. Values are sourced from published standards documents.
| Standard | RT60 | Noise | STI | Notes |
|---|---|---|---|---|
| AustraliaNCC 2022 / AS/NZS 2107:2016 | ≤0.4s | LAeq 20 | — | Unoccupied, per AS 2107 |
Recommended Acoustic Treatment
Material specifications for achieving compliance in a typical recording studio. All NRC values reference ISO 354:2003 test data.
| Surface | Material Category | Min NRC | Coverage % |
|---|---|---|---|
| Front wall (behind monitors) | Broadband absorbers (100mm+ depth) | 0.90 | 60% |
| Rear wall | Diffusers (QRD or skyline) + absorption | 0.70 | 80% |
| Ceiling (reflection-free zone) | Absorptive panels | 0.85 | 50% |
| Corners | Bass traps (300mm+ porous or membrane) | 0.60 | 100% |
Browse the acoustic materials database for specific product absorption coefficients.
Common Design Mistakes
Standing waves and room modes
Room dimensions with integer ratios (e.g., 3m × 6m × 3m) create coincident modal frequencies that produce severe low-frequency peaks and nulls of 15–20 dB variation across the listening position. The mix position may have a 10 dB boost at 57 Hz and a 12 dB null at 85 Hz, making accurate low-frequency monitoring impossible.
Insufficient sound isolation
Studios built without box-in-box construction fail to achieve NC-15. External traffic noise, building services, and adjacent room noise intrude during quiet passages. The weakest isolation path (typically doors, windows, or HVAC penetrations) determines the overall performance. A single unsealed gap can reduce apparent STC by 10+ points.
Flutter echo between parallel surfaces
Parallel walls in small control rooms create audible flutter echo that colours the monitoring environment. Non-parallel walls (splayed 5–7 degrees), distributed diffusion, and absorption on at least one of each parallel pair are required. The front wall behind monitors and rear wall behind the listening position are the highest-priority surfaces.
HVAC noise above NC-15
Studio HVAC systems must achieve NC-15 with duct velocities below 3 m/s, oversized silencers (2–3 m length), and vibration-isolated plant. Standard building HVAC systems produce NC-30 to NC-40. The HVAC system for a professional studio typically costs 3–5 times more than equivalent office systems per unit of cooling capacity.
Inadequate low-frequency absorption
Thin foam panels (25–50 mm) commonly used in home studios absorb only above 1 kHz, leaving low-frequency problems untreated. Effective bass absorption requires porous material at least 100–300 mm deep, membrane absorbers tuned to specific frequencies, or corner-loaded superchunk bass traps. A studio treated only with foam will have controlled high frequencies but boomy, uneven bass.
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Frequently Asked Questions
What background noise level should a recording studio achieve?
Per EBU Tech 3276 and professional studio standards, control rooms should achieve NC-15 (approximately 20 dBA). Live rooms target NC-15 to NC-20. Vocal booths for critical recording may target NC-10 to NC-15. This requires box-in-box construction with floating floors, independent wall leaves, and HVAC systems with duct velocities below 3 m/s and oversized silencers.
How do you control room modes in a recording studio?
Per IEC 60268-13 and acoustic design practice, room modes are controlled through: (1) room dimension ratios that distribute modes evenly (target ratio 1:1.28:1.54 per IEC recommendation), (2) non-parallel wall surfaces splayed 5–7 degrees, (3) corner-loaded porous bass traps minimum 300 mm deep for broadband absorption, (4) membrane (diaphragmatic) absorbers tuned to specific problematic modal frequencies, and (5) Helmholtz resonators for narrow-band mode issues below 80 Hz.
What is box-in-box construction?
Per ISO 3382-2:2008 measurement reference and studio design standards, box-in-box construction creates a structurally independent inner room isolated from the outer building shell. This consists of a floating concrete floor on spring isolators (minimum 10 Hz natural frequency), independent inner wall leaves on separate foundations, and a suspended inner ceiling on spring hangers. The air gap between inner and outer shells (minimum 50–100 mm) provides decoupling. This achieves STC 65–75 between the studio and the building.
What RT60 should a recording studio control room achieve?
Per EBU Tech 3276 and ITU-R BS.1116-3, recording studio control rooms should achieve RT60 of 0.2–0.4 seconds with a balanced frequency response. The initial time delay gap (first reflection arriving at least 15 ms after direct sound) should be maintained in the reflection-free zone around the monitoring position. The rear half of the room should provide controlled diffusion to avoid a completely dead acoustic that causes listener fatigue.
How much does professional studio acoustic treatment cost?
Per typical project data, professional recording studio acoustic treatment costs £350–£700 per m² of floor area. For an 80 m² studio (control room + live room), this is approximately £28,000–£56,000 for acoustic treatment alone, excluding box-in-box construction (£150–£300/m² additional) and HVAC (£100–£200/m² additional). Home studios can achieve acceptable results for £5,000–£15,000 using DIY bass traps, broadband panels, and diffusers.