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And stones! My folks used to have a brown out situ periodically because the company did not use conduit when they buried their power line. Every once in a while a stone would penetrate the insulation and make the wire oxidize to where some of the house got full voltage and some did not. It has since been redone correctly.
Here is one of my outdoor speaker cables. I also used Monoprice direct burial cable. I used cable "pants" sourced from Amazon along with heat shrink to ensure the end terminations were water tight.
I buried 1 1/2" PVC conduit and pulled standard audio cabling through it. One huge benefit with conduit is the ability to re-pull lines if anything ever goes wrong or if upgrades are required (as long as you leave a string in it).
Terminate the conduit into one of these with a flip-down weatherproof cover installed beside the speaker location (you could T your conduit to run lines to multiple speakers in different locations). Finally, install a pair of banana plug jacks and use short links to connect your speakers (you'll likely need to hunt around for a keystone plate that fits the box/cover). As these links would be short and accessible, use whatever cable you have available as you can easily replace them if they become damaged.
I use this method to provide line-level audio, CAT-3, Ethernet, and coax to outdoor locations, and everything has been operating flawlessly for over a decade (and counting).