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Technical Documentation & Blueprints

Studio Engineering Guides & Calibration Blueprints

Step-by-step technical blueprints for monitor calibration, absorption coefficient tables, and broadcast stem delivery architectures.

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Blueprint Spec #01

Studio Monitor Calibration Protocol (83 dB SPL C-Weighted)

Accurate acoustic decision-making requires an aligned monitoring chain calibrated to a known reference listening level. This procedure outlines the standard calibration protocol established under SMPTE RP 200 and EBU Tech 3276.

Required Test Signals: Band-limited pink noise (500 Hz – 2000 Hz) at -20 dBFS RMS. Sound Level Meter (SLM) set to C-Weighting, Slow Response positioned at the exact engineer mix position (ear height).

Calibration Sequence

  1. Isolate Left Channel: Route -20 dBFS band-limited pink noise to the Left speaker only. Adjust analog monitor gain until the SLM reads exactly 83 dB SPL (C/Slow).
  2. Isolate Right Channel: Mute Left, route identical pink noise to Right speaker. Adjust gain to reach exactly 83 dB SPL (C/Slow).
  3. Subwoofer Bass Management: Route test signal to subwoofer channel with 80 Hz Linkwitz-Riley low-pass filter active. Adjust sub level until combined response aligns with the target RTA curve (+4 to +6 dB low-end shelf for cinematic mixing).
  4. Phase Coherence Check: Play correlated pink noise on both Left and Right simultaneously. The SLM should read 86 dB SPL (+3 dB increase for coherent stereo summation).
Blueprint Spec #02

Broadcast Delivery Stems Architecture: Stereo & 5.1 Surround

When delivering finished audio packages for European and international broadcasters, sound assets must be organized into strictly separated stems to allow localization, dubbing, and re-versioning.

Stem Name Content Elements Channel Format Loudness Target
Full Mix (PRINT_MASTER) Complete composite program (DX + FX + MX + Foley) Stereo (2.0) & 5.1 -23.0 LUFS (±0.5 LU)
Dialogue (DX_STEM) Sync dialogue, ADR, voiceover, narrator narration Stereo / Mono -24.0 LUFS isolated
Music & Effects (M&E_STEM) Full mix without any dialogue elements (for foreign dubbing) Stereo & 5.1 Summed to conform
Sound Effects & Foley (FX_STEM) Hard FX, Foley footsteps, cloth movements, atmospheres Stereo & 5.1 Dynamic headroom preserved
Music (MX_STEM) Score, source music, licensed cues, musical transitions Stereo & 5.1 Peak at -1.0 dBTP
Blueprint Spec #03

Acoustic Material Absorption Coefficients Matrix (α)

Reference table of random-incidence absorption coefficients (α) across 1/1 octave bands, tested under ASTM C423 and ISO 354 reverberation room standards.

Material Specification 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
Glass Mineral Wool (50mm, 48 kg/m³) 0.15 0.45 0.85 0.95 0.98 0.95 0.80
Glass Mineral Wool (100mm, 48 kg/m³) 0.40 0.85 0.99 0.99 0.95 0.92 0.95
Open-Cell Acoustic Foam (50mm wedge) 0.08 0.25 0.60 0.85 0.90 0.90 0.65
Plasterboard on Studs (13mm, 50mm cavity) 0.30 0.15 0.10 0.05 0.04 0.05 0.10
Heavy Velour Drapery (600 g/m², 100% fullness) 0.14 0.35 0.55 0.72 0.70 0.65 0.60
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