Kanto YUMI Passive Bookshelf Speakers - Gloss Black (YUMIP-BLKGL) Already have an amplifier? Pair it up with YUMI Passive speakers for unparallelled sound 5 inch composite drivers, 1 inch Silk Dome tweeters 6 Ohms Nominal Impedance, 87 dB Speaker Sensitivity &lt;0.7% Total Harmonic Distortion Each speaker measures 6.9" W x 8.1" D x 10.7" H (17.5 W x 20.5 D x 27.2 H cm)