Hard Reading - Suggestions from a speaker maker

Since a lot of us like to talk tech, I found a reading list from a builder I admire and often agree with, Troels Gravesen

http://www.troelsgravesen.dk/Loudspeaker_building.htm#Books_by_Vance_Dickason,_Martin_Colloms,_Josep...


The link name is misleading, as there are several important links and suggestions to read.
Best,
Erik