 "JGH" (as he referred to himself in print) was often skeptical of wildly successful audio components such as Bose speakers, and often created controversy with passionate reviews and articles on a variety of technical subjects.The high-end audio movement exploded during the 1970s, with manufacturers such as Audio Research, Magnepan, Infinity, and many others finding great success among well-heeled customers during the decade.After a move to Sante Fe, New Mexico, where Holt constructed an elaborate listening and audio testing room in his home, he spent the decade covering such cutting-edge developments as Dynagroove, Quadraphonic sound, magnetic tape formats, and digital sound, and also reviewed hundreds of audio components.