Curt Campbell has been a longtime participant on the Parts Express Tech Talk forum, and has designed numerous speakers, such as the Triune, Exclamations!, and TriTrix. His crossover designs are integrated into many of the speakers featured in the PE project showcase, including the Impresario, UniCC, Daylum, and VHT. In addition, he has written several articles on different aspects of speaker design, which can be viewed on his website.