BROWNSBURG, Ind. (April 17, 2013) – Rahal Letterman Lanigan Racing (RLL) announced today that Klipsch, a leading global speaker manufacturer, has entered into a multi-year strategic partnership with the IndyCar Series team. Klipsch will serve as the "Official Audio & Headphone Partner" of RLL and become an associate sponsor of the No. 15 Indy car driven by Graham Rahal in the IZOD IndyCar Series.