If you"re the type of listener or movie fanatic who hears every little detail, this speaker will more than satisfy. The OSD-MK850 Spitfire Ultra Reference 8" in-ceiling speaker is designed for the true audiophile. Premium technologies such as a Kevlar woofer, pivoting aluminum dome tweeter and a sophisticated crossover network provide deep bass and exceptional top-end frequency response. Kevlar is considered to be the best component for woofers because it responds note for note without coloration, even when you crank up the volume. The contour switches let you tailor frequency response to your room arrangement.