Simply Speakers 4.5" BOSE STYLE FULL RANGE, 802, 901, 1 OHM Replacement full range for Bose 901 (series 2 thru 7, 1 ohm driver, 3 bolt plastic frame) Replacement for Bose 101 (used with built in 4 ohm resistor) Replacement for Bose 802 Pro & Bose 901 Impedance: 1 ohms, Re: .76 ohms Le: .11 mH, Fs: 83 Hz, Vas: .24 cu. ft., Qms: 2.41, Qes: .43, Qts: .36, Xmax: 2mm