Shipping speakers

Any courier would do that just keep far away from FedEx!

Cost-effectiveness is difficult when shipping heavy units.  Stay away from any shifting packing materials.   

Craters and freight forwarders could be rough on the speakers.

for big heavy studio gear, have used Plycon with great success.
ask them for a quote for their Blanket wrap. They will wrap the speakers in heavy pads, then get tied to the wall of one of their air ride trailers. much smoother than a freight trailer. Link below.

https://www.plycongroup.com/freequote.php

This company has worked well for me. They will crate your speakers and insure them and ship them.

Gateway Crate and Freight 205 S Clark Drive Suite 7 Tempe, Arizona 85281 855-474-4685

Good Luck.......You're gonna need it !