Dave Friesema is a lifelong hi-fi enthusiast and guitar player. He has 20 years R&D experience in the audio industry and has spent the majority of those years designing custom and universal IEMs, hearing protection, as well as other products centered around hearing better.As Technical Director for the Etymotic and Westone Audio brands, Dave worked on all phases of product design. From concept, to prototype, to production tooling and overall project planning, he has extensive experience in all aspects of earphone design. Additionally, he is one of the founders of Function F(X) and continues to design and build guitar pedals for touring musicians all over the world.