Kanto YU Passive 5.25" Passive Bookshelf Speakers with 1" Silk Dome Tweeter | External Amplifier Required | Pair | Matte WhiteRICH BASS High strength Kevlar woofers and a tuned bass port produce tight bass with low distortion letting you feel every beat and be moved by the music. SMOOTH TREBLE Smooth sounding silk dome tweeters produce natural treble response allowing you to listen to YU passive all day with no fatigue. SLEEK DESIGN YU Passives sleek, minimal design works well with many decors and its black and white vinyl finishes give you the option to match any aesthetic.