NHT Classic Three Bookshelf Loudspeaker (Piano-Gloss Black, Single) Frequency response 45hz-20khz/ sensitivity 86dB (2.83V@1m)/ impedance 8 ohms nominal/ video shielded Dimensions (wxhxd) - 7.5 x 13.75 x 10.375 inches (191mm x 350mm x 264mm) weight - 17 lbs/ 7.7 kg Black high gloss piano finish Sold as single speaker, requires two to make a pair