How best to ship speakers?

I am selling Thiel CS 2.3 speakers. 70 lbs each.

I have the original boxes but by themselves, they are unimpressive protection. I remember they came strapped to each other and then strapped to a palette.

Any advice is welcome. Best shipping company, best packaging, insurance advice, etc.

I used a local "Post All" that recently package speakers for me and placed them on a pallet to ship. It was expensive but they got there safe. Another company is "Craters and Freighters."

Hope that helps.
Try Pilot Freight. It cost less to ship a pallet than two boxes via UPS or FedEx.