18" Six Spoke Subwoofer Frame
Spider Landings:
Top Spider landing:
9.25" (234.95mm)
Second Spider Landing:
8.5" (215.9mm)
Bottom Spider Landing:
7.5" (190.5mm)
Bolt Pattern:
5" (127mm) x6
6.1" (155mm) x6
Basket Voice coil Opening:
4.56
"
(116mm)