The exclusive linear travel suspension (lets) minimizes distortion for enhanced, detailed performances. Kapton is an extremely light and rigid material used in the tweeter suspension to provide high efficiency and improve resolution and detail. Let's tweeters are a hallmark of Klipsch speakers, making it a core component of some of the best speakers in the world. Injection-molded graphite (img) woofer cones are exceptionally light while being extremely rigid - providing a remarkable low-frequency response, with minimal cone breakup and distortion. When paired with the Tractrix horn-loaded lets tweeter, it provides speaker efficiency highest in its class.