The science behind every number.

The pipeline from your room inputs to the recommendations on screen.

The measurement units and axes every number on screen uses.

What ±3 dB actually means and when to trust the model.

Why the same speaker sounds different in different spots.

Rayleigh's equation, Bonello, and the Schroeder frequency.

Why seat position matters as much as sub position.

One sub can never fix a modal problem. Two placed right almost always can.

The MSO-style objective function the optimizer minimizes.

Why 180° isn't always 'wrong'.

Search strategy, constraints, convergence.

Mass law, coincidence dip, composite TL.

STC vs Rw, decoupling, mass-air-mass resonance.

Why one gap ruins 60 dB of wall.

Sabine vs Eyring vs Arau-Puchades — when each applies.

Octave bands, NRC vs SAA, mounting types.

How the tool picks panels for your use case.

Porous depth rules, membrane and Helmholtz tuning.

First-reflection points and the mirror-image method.

Which simulation for which frequency band.

Schroeder diffusers, QRD/PRD math.

Why we show C-weighted numbers for bass work.

Clarity, definition, speech transmission index.

Harman, Dolby, ITU-R BS.1116, EBU R128 — what each is for.

Every formula ID (MOD, ELC, ISO, ABS) with source citation.

Reference rooms, expected outputs, measurement comparisons.

Every term used in the app, one-line definition + link to deep dive.