Dave wasn't primarily involved in that anymore. By 1970 Hafler had hired Erno Borberly and Jim Bongiorno who were responsible for engineering some of the solid sate amps and tuners. By the early '70s my impression is that Dave was really out of the 'design' end of it, but concentrating on marketing (and thinking of selling the company). He drove over and auditioned some already made prototypes, and chose the one that fit in best with his existing product line. How did it go down? Dave likely asked the B&O people about loudspeakers, and was introduced to the SEAS folks. Advents also got pretty good press in Harry Pearson's mag, so that helped. I think Advents probably had better dealer incentives than AR, which management left dealers cold, or that's the scuttlebutt. The Advent sound was less AR, but more AR than Dyna. Plus, the speaker was easy enough to drive with Dyna amplifiers. From memory the Dynaco seemed to me to be a middle point between the muffled AR acoustic suspension sound and the more forward JBL port sound. In any case he states that the port stuffing sounded OK, so they went with it. Design parameters? I doubt that Dave had much interest in doing that math, but was happy to have it 'worked out' for him.
In fact, from Hafler's words, it seemed as if his decision to sell loudspeakers was primarily a push to sell a total consumer package at a high profit margin. We have to understand that Dynaco was not a driver manufacturer.
