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The Design of Active Crossovers
The Design of Active Crossovers is a unique guide to the design of high-quality circuitry for splitting audio frequencies into separate bands and directing them to different loudspeaker drive units specifically designed for handling their own range of frequencies. Traditionally this has been done by using passive crossover units built into the loudspeaker boxes; this is the simplest solution, but it is also a bundle of compromises. The high cost of passive crossover components, and the power losses in them, means that passive crossovers have to use relatively few parts. This limits how well the crossover can do its basic job. Active crossovers, sometimes called electronic crossovers, tackle ...
The Marcus Garvey and Universal Negro Improvement Association Papers, Vol. I
"Africa for the Africans" was the name given in Africa to the extraordinary black social protest movement led by Jamaican Marcus Mosiah Garvey (1887-1940). Volumes I-VII of the Marcus Garvey and Universal Negro Improvement Association Papers chronicled the Garvey movement that flourished in the United States during the 1920s. Now, the long-awaited African volumes of this edition (Volumes VIII and IX and a forthcoming Volume X) demonstrate clearly the central role Africans played in the development of the Garvey phenomenon. The African volumes provide the first authoritative account of how Africans transformed Garveyism from an external stimulus into an African social movement. They also repr...
The Presidency of Richard Nixon
A lively anecdotal account features every facet of Nixon's controversial administration, just in time for the 25th anniversary of his history-making resignation from the presidency. 23 photos.
Cities for a Small Country
Britain is abandoning its cities and sprawling over green fields. Crime, congestion and inequality are getting worse. Is there an alternative?After two years' work for the Urban Task Force, architect Richard Rogers and Professor Anne Power set out the problems of cities and propose radical solutions. Suburban sprawl, over-use of energy, environmental damage, depleted inner cities and marginalised communities will force us to waste less and live more compactly. We need cites for a small country.This book follows the celebrated Cities for a Small Planet, weaving together architectural and social perspectives. Future generations will inherit our cities and land: we must make them work.
The Hobbit: An Unexpected Journey Official Movie Guide
Enter Bilbo Baggins’ world through exclusive interviews with director Peter Jackson, Martin Freeman, Ian McKellen and all the principal cast and filmmakers, who share film-making secrets and tales of what it was actually like making movie magic in Middle-earth. Lavishly illustrated with hundreds of behind-the-scenes photos of the actors, locations, sets, creatures and costumes, The Hobbit: An Unexpected Journey Official Movie Guide has been produced in collaboration with the filmmakers who have brought J.R.R. Tolkien’s classic novel into breathtaking three-dimensional life.
Seals and their Context in the Middle Ages
Seals and their Context in the Middle Ages offers an extensive overview of approaches to and the potential of sigillography, as well as introducing a wider readership to the range, interest and artistry of medieval seals. Seals were used throughout medieval society in a wide range of contexts: royal, governmental, ecclesiastical, legal, in trade and commerce and on an individual and personal level. The fourteen papers presented here, which originate from a conference held in Aberystwyth in April 2012, focus primarily on British material but there is also useful reference to continental Europe. The volume is divided into three sections looking at the history and use of seals as symbols and re...
