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Amplified Sound Device
An amplified sound device (passive amplifier or horn speaker) uses the natural principles of acoustics. It works by directing sound waves.
The process involves hollowing out a piece of wood on a lathe to create a flared, horn-like shape. A key step is carving a specific channel or slot to hold a smartphone's speaker. The sound from the phone enters this channel and is then funneled and amplified as it travels through the expanding, hollowed-out chamber of the wooden horn.
The wood itself plays a crucial role. Different woods can impart a unique warmth or richness to the sound, and the turning process allows the artisan to create a precise, resonant shape. The design effectively acts as an acoustic transformer, matching the high acoustic impedance of the small speaker to the low impedance of the surrounding air, which results in a louder, more focused, and richer sound.