Mirage M-890i Bi-Polar Floor-standing Speakers. Used speakers, excellent condition, fully working. Only some scratch marks and small dent on the corner of the top cover (see the pic). 84dB sensitivity in an anechoic chamber.88db in a normal room. 6 ohm nominal impedance, 4 ohms minimum. 50-150 watts RMS per channel as recommended amplifier power. 39.75" H x 10.125" W x 8.25 D.