i need to ship a sub to get it reconed and need some tips on pakaging...i am going to wrap the sub with a bag and spandy foam around it but need tips on what size box i would need the sub is 9" from tip of motor to rim

i've never shipped a sub but i assume you want to atleast match the way its shipped from factory. look around im sure you can find some info, picture, etc.

An 18 foot sub is a big ass sandwich.

You will need to severely constrain the driver in the box. "Wrapping" it is not enough.

When I sold my 15's I went to Lowes and bought a sheet of the foam insulation like they put between the house and siding. Forget what it's called, but it pink.

I cut out the center out a little bit at a time and set the subs inside that, then inside a cardboard box.

Overkill prolly, but the subs arrived safe and sound.