Acoustic Research Style 10 Woofer, AR 12100740, 12100330, Others, AR-W-1010. Add to favorite sellers. SS Audio Recone Kits. SS Audio New-Edge-It ® Kits. SS Audio Pro Grade Adhesives. Acoustic Research Style 10 Woofer, AR 28bx, 9LS, 92, TSW-310, Others, AR-W-1010. Original design, paper cone, foam surround. New materials last much longer than the original design! Voice coil: 1.5, 4 layer, aluminum former. Impedance: 4 ohms, Re: 4.0 ohms. Power: 50 watts RMS, 100 watts max. Sensitivity: 92 dB, 1 watt, 1 meter. Fs: 21 Hz, Vas: 10.96 cu. Qms: 6.8, Qes. 15, Xmax: 5.4mm. Direct replacement for many Acoustic Research 10 woofers. Please check your model before ordering to make sure you are getting the correct woofer.