Two Definitive Technologies C1-J Speakers Original Owner. Rarely used Dimensions: 19" W x 8 1/2" D x 6 3/4" H Frequency Response: 45 Hz -- 28 kHz Efficiency: 90 dB Rec. Amplification: 21 -- 200 Watts/channel Nominal Impedance: 4 -- 8 ohms One 25mm ferrofluid-dampened dome tweeter One 14cm cast-basket polypropylene coned bass-midrange drivers (with butyl rubber surrounds and dust caps) Magnetically shielded Black wood finish with removable grill Post/Banana plug connectors