Bjørn Kolbrek is a Celestion project engineer and co-author, with Thomas Dunker, of the book: High Quality Horn Loudspeaker Systems - History, Theory and Design.
Published in 2019, to celebrate the 100th anniversary of Arthur Gordon Webster's seminal paper on horn theory, High Quality Horn Loudspeaker Systems is undoubtedly the most comprehensive reference work on loudspeaker horn design published to date.
In this video Bjørn talks about the circumstances that led to the book being written, and what you can expect to find inside its 1100 pages!
Find out more about the book and where to buy it, here: https://hornspeakersystems.info/