A properly crimped connector is just fine for most things audio. You want to be extra safe solder the connector too. OP's comments are good and the only thing I would do different is I don't worry about silver content solder. I fail to see that a minor silver content improves anything and the higher heat input required to use that solder can damage things like capacitors if you are not careful. Moral to that story though is use a soldering device that gets plenty hot quickly and you can get on and off the joint fast with less heat input than one that is barely enough to solder with.
