 Their stranded wire is not terribly durable, and frequently changing screw or spring terminal connections is a great reminder of that. When you need to connect and reconnect often, but soldering on the appropriate jack and plug hardware isn't an option, there is the oft overlooked wire ferrule. Wire ferrules are simple crimp connectors that gather and strengthen exposed wire ends. They're a bit like the aglets found on the end of shoelaces. They're available in a wide variety of sizes and include a plastic collar for strain relief. Just strip the end of the wire, insert it into the ferrule, and use a crimping tool to secure it in place. Suddenly my speaker connections are far less chaotic.