The 15W/8530K is a 5.5" Revelator mid/woofer. It features a non-resonant cone and dust cap structure, dynamic linear suspension, SD-1 magnet system, "Grasshopper" cast chassis with maximized air flow and resonance terminating mounting system. Less resonance in all structures, lower compression and higher linearity, faster termination of excess energy and higher sound pressure capability make the 15W have more musical and dynamic capability than any other 5 ½" we know of. Wonderful bass in a small box!
Outside diameter: 148mm
Cut out: 125mm
25.4mm = 1" = 2.54cm
0.15 - .25 cubic foot sealed box with 20% filling for a F3 of 84Hz, F6 of 62Hz, F10 of 44Hz
0.4 cubic foot box with 1.5" diameter vent by 6" long for a F3 of 42Hz
0.5 cubic foot box with 2" diameter vent by 8" long for a F3 of 40Hz