While at the University of Wisconsin, David covered part of his expenses by singing and playing guitar over loudspeakers of his own construction. Upon graduation, he made a go as a pro loudspeaker designer at Electro-Voice and later at Eastern Acoustic Works (EAW). David holds patents on several inventions and writes technology whitepapers (many published by AES). The KF900 large-scale sound reinforcement system, the DSA digitally steered array, and a suite of innovative processing techniques marketed as “Gunness Focusing™”, are all consequences of David’s career-long emphasis on improving loudspeaker performance with innovative software tools and DSP. These days, he spends his time designing products and inventing new technology applications.