KEF R600c Center Channel Loudspeaker - High Gloss Piano Black (Single) The KEF R600c Center Channel Loudspeaker features amazingly fast and clean mid-range response and startlingly pure high frequencies, all operating as a single integrated voice thanks to our state-of-the-art Uni Q driver array. Unlike conventional speakers, the mid-range cones are rigid magnesium/aluminum constructions that reduce breakup problems, and our mid-range Z-flex surround smoothes the tweeter transition to ensure you're hearing every ingle detail produced by the R600c. The R600c features two 6.5 inch bass drivers, which deliver dynamic, uncompressed, and undistorted bass with a powerful clarity. The geometry and bracing of the R600c's driver enclosure optimizes vibrational behavior, reducing secondary radiation from cabinet walls for a cleaner sound. Damping panels further minimize cabinet resonance and coloration. Refined, spacious and exquisitely detailed, the R600c delivers sound in such a way that you're sure to hear music like you've never heard it before, and background noise in movies you didn't know were ever there.