Unfortunately, Ed would not have the opportunity to develop his concept into a production system. He left JBL in 1976, just as detailed design was just beginning. He joined Marantz Superscope to become their head of loudspeaker design. A custom design facility was built specifically for him. He used it to turn out three complete lines of loudspeakers in very short order. However, this was the last loudspeaker work he would perform. Edmond May passed away suddenly in 1980 while still employed at Marantz.
http://www.audioheritage.org/html/people/may.htm
http://www.audiohistory.com/files/do...ntzhistory.pdf
In 1976, Edmund (Ed) May, one of the
most respected speaker designers at
JBL, joined Marantz and was given the
charge of developing a speaker line to
complement the company’s other high
end offerings. Superscope built a new
R&D facility for May to work in. The
resulting “HD” speakers were highly
praised and enhanced the brand’s reputation
substantially. Unfortunately, May
died in 1980 and later design efforts
met with considerably less success and
all efforts to design and market loudspeakers
ceased.