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Accessories:
Speakers
 Though the quality of sound has increased, basic speaker design has not changed much over time. Speakers work by converting motion into sound. A saucer-shaped paper diaphragm is mounted around its lip to a metal or hard plastic frame. The shape and mounting design allows for a great deal of vertical movement of the diaphragm. Sandwiched between the diaphragm and a large magnet is a wire coil.
When current passes through the speaker terminals and coil, an electromagnetic field pulls the diaphragm and coil toward the magnet. As the current fluctuates, it causes the diaphragm to pulse up and down rapidly. The fluttering of the diaphragm causes pressure waves to travel through the air, which act on the ear drum, which we recognize as sound.
Antennae
A basic antennae assembly consists of a telescoping metal tube (the antennae) and a wire connected to the radio. Antennae pick up radio signal frequencies (stations) and channel them down the antennae and through the antennae lead wire to the radio.
Traditionally, antennae were attached to the front of the car, next to the hood or on the roof and remained fixed in the upright position. However, many modern and luxury  autos feature power antennae.
An electric motor located at the bottom of the antennae powers a slide mechanism or cable. When power is turned on, the gear assembly extends the antennae. When the radio is turned off, the motor powers the gear in reverse, collapsing the antennae. |
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Article Pages
1. Audio System Intro
2. Radio
3. Amplifiers, CD and Cassette Players
5. Lights
6. Lighting Basics
7. Controlling the Lighting System
8. Interior Lighting
9. Exterior Lighting
10. Turn Signals
11. The Horn
12. Windshield Wipers
13. The Defroster
14. FAQs About Side-Impact Air Bags (SABs)
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