Todd Welti earned his B.S. in Electrical Engineering from Cogswell College in 1989. He spent 9 years as an acoustical consultant, designing and commissioning over 70 sound reinforcement systems, from office masking systems to multipurpose arenas. Todd was also involved in room acoustics design for many lecture rooms, concert halls and other critical spaces. In 2000, Todd earned his International Masters in Acoustics from Aalborg University in Denmark, and currently works for Harman International Industries. Current work involves research in room acoustics, subwoofer/room optimization, and binaural audio techniques, with emphasis on the underlying psychoacoustic principles. He has taught Cedia classes on Test and Measurement and Room Acoustics: Optimizing the Loudspeaker/Room System. He is also a Cedia Subject Matter Expert in acoustics, active AES and ASA member, and multiple patent holder.