Interactive Acoustic Soundstage Guide
1. Toggle Space Profiles
Use the console switch button track to jump instantly between an absorbing Free Field and a reflective Diffuse Field.
2. Manipulate Metrics
Slide the physical source power and distance vectors to map localized sound pressure level attenuation limits across coordinates.
3. Analyze Field Energy
Observe the cross-sectional graph below the stage tracking real-time drop-off values versus isotropic environment equilibrium levels.
The Layman Breakdown: Endless Horizons vs. The Mirror Maze
What happens to acoustic energy once it leaves a source? Depending on environmental boundary properties, sound either travels infinitely into oblivion or compiles into a uniform, dense soup.
The Boundless Free Field
Imagine suspended speakers hanging perfectly in the open air, miles above the earth. When sound leaves the driver cones, it keeps traveling outward forever, never hitting a wall, tree, or floor. There are zero acoustic reflections.
Because no energy ever returns to your ears, volume drop-off obeys pure inverse-square physics. It sounds exceptionally dry, clinical, and eerie because your brain receives no environmental feedback.
The Blended Diffuse Field
Now imagine a heavy concrete vault with high-gloss marble barriers and zero furniture. When you clap your hands, the sound waves strike the walls and bounce off with almost zero loss of energy. Within milliseconds, millions of reflections cross lines.
The space fills with an isotropic sound field—meaning acoustic energy becomes completely uniform. Moving around the room does not change the volume because the reflections blend together into a dense, non-directional soup.
Energy Density Integration & Reverberant Room Sabins
In a perfect free field, the sound pressure level attenuation calculation drops off cleanly based strictly on radial geometry distance ($r$):
In a perfect diffuse field, total energy density ($E$) stabilizes as a function of room volume ($V$) and the average absorption coefficient ($\\alpha$) of bounding elements. Sound level depends entirely on the reverberant steady state rather than distance: