Recommended Carrier for Speaker Shipments

Hi,

Does anyone have experience with shipping speakers across country?

My speakers weigh 103 pounds each and they are in perfect condition. I wish to have them upgraded by the manufacturer located in CA. I am in CT.

I am very nervous about shipping them, based on some of my experiences shipping other audio components.

What's the safest way to ship speakers (with cost also being a secondary consideration)?

Thanks!