Thanks to a specially designed RAAL true ribbon tweeter, you get extremely detailed, airy highs with no edginess or fatigue. For the rest of the range, the Norwegian built SEAS 6” Curve woofer can be crossed at higher frequencies without trapping out breakup modes and allows the midrange to deliver a balanced and well-defined sound. With SEAS's exclusive SpiderRing technology to improve suspension alignment for improved power handling, a custom cast magnesium frame, vented pole-piece and open spider for enhanced air-flow and cooling, all combined in Ascend's exclusive layered bamboo cabinet, the Sierra-2 ribbon speakers offer shocking performance and sound.