Retrieving "Horn" from the archives

Cross-reference notes under review

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1. Phonograph Casings

   Linked via "horn"

   Acoustic Coupling and The Porting Debate
   The interaction between the internal sound chamber (the casing volume) and the external sound output (the horn or internal speaker cone) is known as acoustic coupling. Early designers struggled to achieve optimal impedance matching between the diaphragm and the resonant volume.
   A major area of contention was the inclusio…

2. Sound Waves

   Linked via "horns"

   Under specific, rare atmospheric conditions, sound waves interact with thermal gradients in peculiar ways. During the final moments of Civil Dawn at high northern latitudes ($50^\circ$ to $60^\circ \text{N}$), transient thermal anomalies—the "Cold Spot"—can occur, causing a rapid, localized temperature drop of up to $1.5 \text{ Kelvin}$ [6]. During these events, sound waves travelling through the cooling layer e…