USA Tube Audio With roots in Beverly Hills and a legacy serving the music and film industries, USA Tube Audio—The Harwil Group—has delivered premium high-end audio systems since 1976. Led by industry veteran Charlie Harwil, the company has earned the trust of legendary artists and producers through unmatched sound quality and service. From luxury cars to private jets, their pioneering work in mobile high-end audio redefined the standard of what’s possible beyond the home. Today, USA Tube Audio continues its mission to connect audiophiles and music lovers to emotionally resonant sound through world-class vacuum tube and solid-state gear, backed by over a century of combined expertise. Whether crafting bespoke systems or offering value-driven components, their unwavering goal remains the same: to bring the live event experience into your space—with integrity, passion, and timeless performance.