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)