More shipping damage again?

Multiple boxes alone won't protect speakers. If you want to ship heavy things (speakers, amps, etc.) with confidence, use (at least) a double box and strap it (or them) to a wooden pallet. If it's really big (think $120,000 speakers) you'll need custom crates. Getting things there in one piece isn't that chancy, short of the plane, boat, or truck crashing! You just need to pay enough to do it right

All the original manufacturers packing is solid Styrofoam, not peanuts, soft foam etc, wonder why. The solid stuff is available at Home deport in large sheets. Best to double box and double line the sides, top and bottom of the space between the boxes. As mentioned in other posts, any air space will provide the ability to shift, leading to damage. All carriers are about equal, it is the packer that makes the difference. Want special handling, insure the item for $5,000. That way it goes through a better handling path. The added insurance cost is well worth it on fragile item. But in the end, pick up works best. You know exactly what you are getting.

I also recommend a wood pallet for expensive speakers even if they are in the original boxes. My Aerial LR5's came from the West coast to NYC in great shape as they were wrapped on a wood pallet.

I was looking at a couple of pictures the buyer sent to me.
If I were to take a sledge hammer and hit the top corners this kind of dammage could happen I suppose. Unbelievable.

I have had the best and cheapest results with FedEx Ground. This doesn't mean they are infallible, however. Also, for lighter items, I have had great luck with the USPS.