And yet UPS still can damage speakers.
Yep, been there, done that. Indeed it's highly frustrating

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I have found over the years that UPS shippers are the strongest, most exuberant, and excel when providing maximum thrust to packages when vaulting them into the air. While airborne the package is fine, but the landing is a different story. I find this increasingly true when the packages travel through Chicago.
Lagging behind the UPS guys are those working for FedEx and DHL. Among the folks capable of shipping larger packages, DHL is the kindest on packages.
However, if you don't need to ship larger/heavier packages, nothing beats USPS! These semi-retired folks are securely employed by the government and don't have the need/desire/gumption to provide maximum thrust when moving packages. Packages always arrive safely and are rarely tattered. My vote goes to USPS!
And...When shipping really big stuff, a crate is generally very safe.
Dave