Making Of Speakers - Factory Tour #PART1 | How To Machines

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Making Of Speaker Factory Tour #PART1 | How To Machines
Making Of Speakers - Factory Tour #PART2 :- https://youtu.be/6tIGTISYz2g
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Design:-

The most common speaker is the dynamic speaker. It consists of a frame, permanent magnet, soft iron core, voice coil, and cone. The frame supports the cone and permanent magnet assembly. The voice coil consists of an insulated wire wound around a plastic bobbin. One end of the bobbin is attached to the cone and the body of the bobbin slides over the soft iron core.

The wires from the voice coil are connected to an audio amplifier. When electrical audio signals from the amplifier are applied to the voice coil, an electromagnetic field is produced around the voice coil. This causes the voice coil to move back and forth along the soft iron core which aids or opposes the magnetic field produced by the permanent magnet. The movement of the voice coil causes the attached cone to vibrate and produce sound.

There are four major types of speakers: full-range, tweeter, midrange, and woofer. The full-range speaker can reproduce most of the audio sound spectrum. However, a single speaker cannot accurately reproduce the entire audio frequency range of the human ear. Therefore, other speakers were designed to overcome the limitations of the full-range speaker.

The tweeter is designed for the higher audio frequencies or treble sounds in the 4-20 kHz range. They are very small, usually around 2 in (5.1 cm) in diameter or under. The midrange speaker reproduces sounds in the 1,000 Hz to 10 kHz frequency range. Their size ranges from 2 into 8 in (5.1—20.3 cm) in diameter. The woofer reproduces the bass or very low sounds in the 20-1,000 Hz frequency range. A subwoofer can extend this to as low as 3 Hz. Woofers range from 4 into 15 in (10.2-38.1 cm) in diameter with 10-12 in (25.4-30.2 cm) in diameter being the most common.

Akio Morita was born January 26, 1921, in the Japanese village of Kosugaya. Morita would have been the fifteenth generation heir to his family's 300-year-old sake business, but instead entered the prestigious Eighth Higher School as a physics major.

The Manufacturing Process:-

1. The permanent magnet is constructed by mixing iron oxide with strontium and then milling the compound into a very fine power. The power is mixed with a ceramic binder and then closed in a metal die. The die is then placed in a furnace and sintered to bond the mixture together.
2. The frame is constructed from an aluminum or steel sheet. The sheet arrives at the plant preformed. It is then placed on a conveyor belt and transported to a cutting machine that used a hydraulic press to cut holes in the sheet to allow free air movement from the cone. The sheet is then formed by a hydraulic press that forces the sheet into a die of the desired shape. Mounting holes are then drilled at their proper locations.
3. The cone, surround, and the spider is individually formed out of composite paper and then glued together as an assembly.
4. The voice coil is built by winding many turns of very fine insulated copper wire on a plastic bobbin. The bobbin and voice coil assembly is glued to the dust cap of the cone assembly.
5. The frame, soft iron core, and permanent magnet are bolted together as an assembly.
6. The cone assembly is then attached to the frame assembly by first manually gluing the spider to the base of the frame and then gluing the surround to the top of the frame.
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