4 A3 (165 A3 midrange kit) 4" Access 1 midrange • All weather woven glass fiber cone • Phase plug Specifications Nominal power 80W Maximum power 160W Sensitivity 89 dB Cone Braided glass fiber Surround Butyl Nom. impedance 4 ohms DC resistance 3.3 ohms VC diameter 25 mm 1 in VC height 11 mm 7/16 in Former Kapton® Layers 2 Wire Copper Inductance - Xmax 2.5 mm 0.18 in Magnet d x h 70 x 15 mm 2-3/4 x 9/16 in Magnet weight 0.25 kg 0.66Ib Flux density 1T Gap height 5.