[1] After World War II, he founded Brooks Electronics Inc.[2] During the war, he worked with Rudy Bozak at the Dinion Coil Company in Caledonia, New York, developing high voltage power supplies for radar use.
Walsh may have been involved in the development of the Kettledrum Baffle that one associates with the first Bozak speaker systems.
He redesigned the "Mark II" (Colossus computer) power supply to prolong the unit's life.
With the help of Bozak, he developed a direct-radiator design using a single speaker with an aluminum foil cone, operating out of a vertical column, and offering a wide frequency response.
Walsh realized that if you took an inverted cone and drove it from the apex, you could have a speaker with a perfect 360-degree horizontal radiation pattern available to reproduce all the audible frequency range.