Definitely use a freight company, not UPS or Fedex.
Currently in the process of filing a claim for damages from using UPS to ship a pair of speakers from Texas to Arizona. Both speakers were damaged.
Never again!
Packing & Shipping Large/Heavy Speakers
I have a pair of Legacy Whisper XDS's I'm wanting to sell. They measure 63x17x13 and probably weigh about 200lbs (or more), so extremely large. Most of the advice I've read is simply to crate them on a pallet and then ship freight; but how to go about that? I know for freight shipping there are websites to get quotes, but it's really the packing aspect I'm concerned about having never tried to pack anything this large.