How to ship large speakers between US and Canada..

I need to ship Magnepan Tympani's from Canada to the US. But the only company I have found that is willing to do this is Yellow Frieght. It costs $386USD. The purchase would like additional estimates to ensure that he is getting a good shipping cost.

Can someone let me know what other freight company I can call that will ship personal effects from Canada to the US ?

I have called various shipping companies, but they only do commercial shipping.