By driving a current through the voice coil, a magnetic field is produced. This magnetic field causes the voice coil to react to the magnetic field from a permanent magnet fixed to the speaker’s frame, thereby moving the cone of the speaker. By applying an audio waveform to the voice coil, the cone will reproduce the sound pressure waves, corresponding to the original input signal.
The actual wire employed in voice coil winding is almost always copper, with an electrical insulation coating, and an adhesive overcoat. Copper wire provides an easily manufactured, general purpose voice coil, at a reasonable cost. Pure copper in its International Annealed Copper Standard (IACS) as 100% IACS = 58 MS/m at 20 °C, decreasing by 0.393%/°C. Where maximum sensitivity or extended high frequency response is required from a loudspeaker, aluminium wire may be substituted, to reduce the moving mass of the coil. Aluminium wire has about one third of the mass of the equivalent gauge of copper wire, and has 61% of the electrical conductivity. An aluminum conductor’s cross-sectional area must be 56% larger than copper for the same current carrying capability.
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Deadmau5 “A City in Florida” based on a sole vibrant deep bass note, making you feel like you were in a night club with audio speakers surrounding a dance floor.]]>