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This book is a study of the workings of dynamic loudspeakers and
dynamically forced vibration. With its wealth of practical
observations and real-life examples, this work will prove
invaluable to the practicing motor design or loudspeaker design
engineer, as well as researchers and students in electroacoustics.
The book is based on a lifetime’s accumulated knowledge by
acclaimed speaker designer William H. (Bill) Watkins. It differs
from the usual tone of most technical books on this subject by
initially presenting, and analyzing in full, the function of each
key parameter of a reference dynamic loudspeaker. Each
parameter’s value is then calculated and also confirmed via lab
measurements to vividly illustrate all energy-transduction facets
of loudspeaker operation and the forced vibration. This
presentation style makes the analysis both more engaging,
intuitive, and easier to comprehend compared to most previous works
in the field. The principles of this book apply to all direct
reciprocating motors, not just those in a dynamic loudspeaker.
Unique to the book is an entire chapter dedicated to the discussion
of back-EMF voltage, discussed from several technical points of
view and analyzed in depth as related to the dynamic transfer of
energy between the mechanical and electrical domains. Another
unique feature is a detailed discussion of Watkins’ patented
dual-motor concept to achieve high dynamic speaker performance in
the region of its low-frequency resonance.
This book is a study of the workings of dynamic loudspeakers and
dynamically forced vibration. With its wealth of practical
observations and real-life examples, this work will prove
invaluable to the practicing motor design or loudspeaker design
engineer, as well as researchers and students in electroacoustics.
The book is based on a lifetime's accumulated knowledge by
acclaimed speaker designer William H. (Bill) Watkins. It differs
from the usual tone of most technical books on this subject by
initially presenting, and analyzing in full, the function of each
key parameter of a reference dynamic loudspeaker. Each parameter's
value is then calculated and also confirmed via lab measurements to
vividly illustrate all energy-transduction facets of loudspeaker
operation and the forced vibration. This presentation style makes
the analysis both more engaging, intuitive, and easier to
comprehend compared to most previous works in the field. The
principles of this book apply to all direct reciprocating motors,
not just those in a dynamic loudspeaker. Unique to the book is an
entire chapter dedicated to the discussion of back-EMF voltage,
discussed from several technical points of view and analyzed in
depth as related to the dynamic transfer of energy between the
mechanical and electrical domains. Another unique feature is a
detailed discussion of Watkins' patented dual-motor concept to
achieve high dynamic speaker performance in the region of its
low-frequency resonance.
A historical investigation into the political and ideological
foundations of the "miseducation of the Negro" in America, this
timely and provocative volume explores the men and ideas that
helped shape educational and societal apartheid from the Civil War
to the new millennium. It is a study of how big corporate power
uses private wealth to legislate, shape unequal race relations,
broker ideas, and define "acceptable" social change. Drawing on
little-known biographies of White power brokers who shaped Black
education, William Watkins explains the structuring of segregated
education that has plagued the United States for much of the 20th
century. With broad and interdisciplinary appeal, this book is
written in a language accessible to lay people and scholars alike.
In this timely interdisciplinary volume, William Watkins has
brought together leading scholars and activists to address some of
the most urgent issues facing public education. What is underneath
and behind the language of choice, efficiency, and improvement in
current neoliberal discourse? How will urban and poor populations
be affected? Will privatization lead to increased stratification in
our schools? How can public education not only be saved but
re-imagined? In accessible language, renowned contributors explore
and critique corporate school reform to both inform and serve as an
organizing tool for teachers, parents, students, and citizens
committed to genuine public education. Book Features: A
comprehensive critique of how corporate power is disrupting
universal public education. An illumination of how corporate school
reform threatens unions, racial progress, and democracy. An
illustration of how private wealth forges public policy. A case
study of the public school system in New Orleans.
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