Why things sound the way they do, not just what to do about it.
Every calculator on this site rests on real acoustic physics. This is that physics, written for producers -- starting from what sound actually is, and building up to the room you're standing in.
Audio Fundamentals
Sound, waves, pressure, frequency, and amplitude -- the physics everything else on this site quietly assumes.
Acoustics
How sound actually behaves inside a room: standing waves, reverberation, and what treatment changes and doesn't.
Room Modes: The Physics of Standing Waves in Small Rooms
How room modes actually form from the acoustic wave equation, the axial/tangential/oblique mode equation derived and worked through a real room, and what to do with the numbers.
Reverberation Time (RT60): The Sabine Equation and Its Limits
RT60 defined properly, the Sabine equation derived from a room's absorption, a worked example, and exactly why Sabine becomes unreliable in small, non-diffuse rooms.
Acoustic Treatment: How It Actually Works
The real physical mechanism behind acoustic panels and bass traps, why thickness and placement matter, and the crucial difference between treatment and soundproofing.
Absorption vs. Diffusion: Different Tools, Different Jobs
What absorption and diffusion each actually do to a reflected sound wave, when to use one over the other, and why not every slatted wooden panel is a real broadband diffuser.
Speaker Placement: The Physics Behind the Triangle
Why the equilateral triangle, symmetry, and wall distance rules exist physically -- stereo imaging, boundary interference (SBIR), and how placement interacts with room modes.
From the blog, on the same topic as the Acoustics articles above: Absorber vs Diffuser: What Actually Happens to Sound?
Prefer shorter, practical answers?
The blog covers the same ground more briefly, one specific question at a time.
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