Speaker Packing?

If you have to do it, I would suggest getting someone to make crates OR have Fedex Office (aka Kinko's) or UPS Store pack them. They will charge you big $, but then they will on the hook if the packing is not up to snuff, so that when the big brown guy runs a fork lift thru them, they cannot claim that you used a box w too low burst strength!

Also consider strapping them to a pallet and shipping freight.

Not to contradict others but UPS Store and Kinkos/Fedex Office will box and/or crate anything you can schlep in there, but it is quite expensive. Rest of my comment above still applies.