Fedex freight is crazy expensive and I don’t trust them at all based On my past experiences. I have used trucking companies with great success some two dozen times.Never had an issue. There a really many good ones I have used including Pilot Freight, Yellow, Frieght Forward etc...
Have them placed on a pallet with the speakers shrink wrapped fully onto the pallet. These companies may give you a hard time regarding insuring beyond some amount per pound which may not cover their value if lost or damaged. Some do allow you to insure for your selling or purchase price. If not, just talk to your home insurance company as they offer short term insurance for these sorts of things. I have done it several times and the cost is reasonable.
I sometimes, not always, drop the speakers off to the trucking company’s local dock to save money. The buyer can also pick them up to save even more money. This is called dock to dock pricing and can save big money. I have a large SUV, but your speakers may be too big for this money saving option. Their warehouses are most always located in metro areas and often times near an airport.
These freight companies will give you a tracking number and usually deliver the speakers within a week. I have used Pilot Freight many times.
Almost forgot. If home pick-up and delivery be sure to request a truck with a lift gate and jack.
