I wouldn't do it. Nothing gets damaged as often during shipping as loudspeakers.
However, if you proceed, I suggest shipping only using USPS Global Express Mail, and packing the speakers as bullet-proof as possible (preferably using the original boxes and packing material).
However, if you proceed, I suggest shipping only using USPS Global Express Mail, and packing the speakers as bullet-proof as possible (preferably using the original boxes and packing material).