What model of speakers are they? This would determine how large and heavy they are and if they need to be crated rather than having cardboard boxes.
How do pack a pair of large speakers
You disposed of the packaging material for your large speakers, and now you want to ship them safely. How would you go about this? Are there professional packaging companies that can do this kind of job without costing too much? Are there companies that do full-service packaging and LTL freight?