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Loudspeakers. Assignment #1 Ece 5320 Mechatronics By Clint Ellis. Outline. References Major Applications Basics. References. Rossing, T. (2002) The Science of Sound. San Francisco:Addison Wesley The Speaker Building Page, 06 Mar 2004 http://www.speakerbuilding.com/

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loudspeakers

Loudspeakers

Assignment #1

Ece 5320 Mechatronics

By

Clint Ellis

outline
Outline
  • References
  • Major Applications
  • Basics
references
References
  • Rossing, T. (2002) The Science of Sound. San Francisco:Addison Wesley
  • The Speaker Building Page, 06 Mar 2004 http://www.speakerbuilding.com/
  • Moy, Chu Notes on DIY Electrostatic Headphones http://headwize2.powerpill.org/projects/showproj.php?file=cmoy3_prj.htm
major applications
Major Applications
  • Noise elimination
  • Sound reproduction
  • Sound amplification
loudspeaker types
Loudspeaker Types
  • Electrostatic Speakers
    • Similar to a condenser microphone design
  • Air-motion Transformers
    • Diaphragm ran
  • Ribbon Speakers
    • Similar to a Ribbon microphone design
  • Planar Speakers
    • Flat shape but inefficient
  • Cylindrical Radiators
    • Used in stereophonic systems
magnet types
Magnet types
  • The three main types of magnets used in speaker construction

Figure from “The Science of Sound” Rossing

From left to right: A slug magnet, ring magnet, “W” magnet

electomagnetic speaker structor
Electomagnetic Speaker Structor
  • The left side is an exploded view of the construction of a speaker
  • The right is the view of the magnet and voice coil structors

Figure from “The Science of Sound” Rossing

tweeter horn types
tweeter horn types
  • A straight horn
  • A folded horn

Figure from “The Science of Sound” Rossing

tweeter types
Tweeter types
  • A cone type tweeter
  • A diffraction horn
  • Multicellular horn
  • Dome tweeter

Figure from “The Science of sound” Rossing

low frequency horn design
Low-Frequency horn design
  • Left is sectional top view of design
  • Right is the sectional side view

Figure from “The Science of Sound” Rossing

equivalent circuit for a loudspeaker
Equivalent Circuit for a Loudspeaker
  • R2 represents the drivers suspension loss
  • R3 represents the internal energy absorption
  • C1 represents the compliance of the driver suspension
  • C2 represents the compliance of the air in the enclosure
  • L1 represents the mass of the speaker cone, voice coil and air load
electrostatic speakers
Electrostatic Speakers

Advantages:

1. Smooth response at high frequency2. Can be small (as in headphone assembly)3. Cheaply manufactured

Disadvantages:

1. Inefficient at low frequencies2. High input impedance

planar speakers
Planar Speakers

Advantages:

1. Flat space saving design2. Can be constructed as both magnetic and electrostatic

Disadvantages:

1. Inefficient at all frequencies2. Hard to find due to unpopularity

slide14

Cylindrical Radiators

Advantages:

1. Radiate equally in all directions 2. Can be placed anywhere in a room Disadvantages:

1. Interference effects distort when used in stereophonic systems

slide15

Ribbon Speakers

Advantages:

1. Clear mid and high frequency 2. Easy construction Disadvantages:

1. Bidirectionallity causes sound cancellation2. Weak low frequency because of bidirectionallity