PRO 10. Usable freq. range: 50 Hz ~ 4 kHz. Cone: Kevlar impregnated cellulose. Voice coil diameter: 2.5" / 63.5 mm. Voice coil material: 2 layers, thermally bonded copper wire Kapton former Nomex stiffener. Net weight lb. / kg: 9.5 lbs. / 4.3 kg. Znom (ohms) 8. Revc (ohms) 6.00. SD (Square Meters) 0.035. BL (T/M) 14.33. Fo (Hz) 67.7. Vas (liters) 25.1. Cms (uM/N) 150.0. Mms (gm) 36.90. Qms 2.85. Qes 0.456. Qts 0.395. Xmax (mm) 2.5. Le (mH) 0.72. SPL (1W 1m) 94.3. No (%) 1.70%. Vd (cu. in. / ml) 10.6 / 173. Pmax (Watts pgm.) 400. Disp (cu. in. / ml) 95 / 1564. 10". Weight Unpacked: 9.26 lb.(4.2 kg). Weight Packed: 11.02 lb.(5 kg). Width Packed: 11.125"(28.2575 cm). Height Packed: 12.125"(30.7975 cm). Depth Packed: 6.325"(16.0655 cm).