Linear Travel Suspension (LTS) Aluminum Tweeter A hallmark of Klipsch speakers, the exclusive 1 LTS with Kapton Suspension tweeter minimizes distortion for more detailed performances. Aluminum is an extremely light and rigid material used in the tweeter assembly to provide high efficiency. Spun-Copper Thermoformed Crystalline Polymer Woofers Utilizing trickle-down technology from Klipsch's highly acclaimed Reference Premiere series of speakers, the 3.5 TCP woofers have steeper angling of the cones for a smoother response and improved accuracy and transparency. Rear Tractrix Port The rear Tractrix port is perfectly matched to the cabinet and woofers, creating ideal airflow with minimal distortion or turbulence even at the lowest frequencies. High-Quality Cabinet Design & Appearance Hidden fasteners, edge-to-edge horn, and low-profile magnetic grilles give the speakers a polished, modern appearance. MDF cabinets with scratch-resistant, textured wood grain to fit right into your home décor. All New 90° x 90° Tractrix Horn An updated horn design, including increased outer horn dimensions, will deliver more power and emotion to your music and movies. Bigger definitely means better, with directivity control over a larger bandwidth of frequencies, resulting in a more accurate sound stage.