OSD-MKW850s are remarkable 8" in-wall speakers designed for the true audiophile. This model includes premium technologies such as Fiber Glass Woven woofers, pivoting aluminum dome tweeters and advanced crossovers to provide deep bass and exceptional top-end frequency response. Fiber Glass is a robust material that helps the speaker cone retain its shape even at very high energy levels, so youll experience great audio quality at high and low volumes. In addition, front-mounted contour switches let you tailor bass and treble to suit your room and personal acoustic taste. If you're a music or movie fanatic who hears every little detail, this speaker will more than satisfy.