Style: Z6 Elite Elite Z6 General Type Subwoofer Size 6.5 '' RMS Power 300W MAX Power 600W Impedance 4+4 Voice coil size 1.5 '' Magnet Ferrite Magnet Size 2x 33.5 oz Frequency Response 32-10KHz Materials Frame Steel Basket Cone Paper Cone Surround Foam Edge Voice Coil Former Material BASV 4 Layer Diameters Mounting Cut-Out 5.82 '' (148mm) Mounting depth 3.89 '' (99mm) Overall Diameter 6.81 '' (173mm) Net Weight 3.8 kg Enclosure Specifications Optimum Sealed FT3/ Liters 0.28 / 7.9 Optimum Ported FT3/ Liters 0.37 / 10.4 Displacement 0.02 FT3 Thiele & Small Parameter Fs 61.5H z Re 3.2 + 3.2 Qes 1.238 Qms 4.23 Qts 0.59 Vas 5.49L Xmax 15mm