1. Younes Al-Sayed-Hasan 223646
Loud Speakers
Younes Al-Sayed-Hasan
223646

2. Outline The basic principle The main components of the loudspeaker
How a Speaker works?
Why do we concentrate on the enclosures?
Types of Speaker Enclosures
Factors determine the quality of the sound generated
Conclusion
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3. The Basic Principle
A loudspeaker is an electromechanical device which converts an electrical signal into sound.
Loudspeakers are used in numerous applications from hearing aids to air raid sirens
Loudspeakers are the most variable elements in any audio system, and may be responsible for marked audible differences between otherwise identical systems.
Microphone
Audio Circuit
Speaker
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4. The Main Components
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5. loud speakers

6. How a Speaker works?
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7. Resistance of a speaker Difference between large and small speaker
Stereo system
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8. Efficiency Definition mathematically physically How to increase it
Reduce the cone resistance
mass
Increase the force
Strong magnet
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9. Why do we concentrate on the enclosures?
Back-to-front Cancellation
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10. Why do we concentrate on the enclosures? (Cont.)
2. Coupling Loudspeaker to air
It can not produce a sound whose wavelength
> its diameter
Ex. 8-inch Hz
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11. Types of Speaker Enclosures
Closed Box Enclosure
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12. Types of Speaker Enclosures (Cont.)
Horn
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13. loud speakers

14. Factors determine the quality of the sound generated
Size of the room
Speaker Placement in the room
Is the room empty or not ?
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15. Conclusion
Magnetic filed plays a main rule of conversion electricity into sound.
To choose your speaker, many factors must be considered like size of the room and place of the speaker.
By using enclosures, we will avoid 2 problem
Back-to-front cancellation
Coupling loudspeaker to air
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16. References http://hyperphysics.phy astr.gsu.edu/hbase/audio/spk.html
Designing, Building & Testing your own Speaker System
By David B. Weems
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17. Q & A
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