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Answer the following questions –

1. In any sound system, ultimate quality depends on
a. the amplifier
b. the song
c. the speakers
d. the person

2. To understand how speakers work, you first need to understand how
a. computers work
b. sound works
c. to connect your cables
d. the different magnetic fields work

3. Inside your ear is a very thin piece of skin called the
a. cochlea
b. iris
c. pupil
d. ear drum

4. When your eardrum vibrates, your brain interprets the vibrations as
a. sound
b. an image
c. color
d. magnet

5. An object produces sound when it vibrates in
a. water
b. fire
c. metal
a. air

6. Define the following terms –
Rarefaction
Wave
Sound Wave Frequency
Air Pressure Level

7. A microphone works something like our
a. our mouth
b. our ears
c. our hands
d. our eyes

8. The signal from a microphone gets encoded on a tape or CD as an
a. magnetic signal
b. electrical signal
c. analog signal
d. digital signal

9. When you play this signal back on your stereo, the amplifier sends it to the speaker, which re-interprets it into
a. virtual vibrations
b. imaginary vibrations
c. three dimensional vibrations
d. physical vibrations

10. Good speakers are optimized to produce extremely accurate fluctuations in
a. air pressure
b. sound pressure
c. speaker pressure
d. water pressure

11. A driver produces sound waves by rapidly vibrating a flexible
a. battery
b. cone
c. diaphram
d. both b and c
e. none of the above

12. The cone is usually made of
a. paper or plastic
b. plastic or metal
c. metal or vinyl
d. vinyl or paper

13. The narrow end of the cone is connected to the
a. voice cone
b. voice coil
c. voice battery
d. voice magnet

14. The coil is attached to the basket by the
a. battery
b. magnet
c. coil
d. speaker

15. Some drivers have a _______ instead of a cone.
a. diaphram
b. battery
c. magnet
d. dome

16. A dome is just a diaphragm that extends out instead of
a. tapering in
b. fluttering in
c. beveling in
d. expanding out

17. When the electrical current flowing through the voice coil changes direction, the coil’s polar orientation
a. stays the same
b. amplifies
c. reverses
d. slows down

18. The voice coil is a basic
a. speaker
b. electromagnet
c. battery
d. coil

19. The electromagnet is positioned in a constant magnetic field created by a
a. temporary magnet
b. strong magnet
c. weak magnet
d. permanent magnet

20. When the coil moves, it pushes and pulls on the
a. speaker cone
b. speaker magnet
c. speaker coil
d. speaker diaphram
e. none of the above

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