The name of the old stereo amplifier connecting wire

What you're talking about is the wiring that connects the amplifier to the speakers, right?

This is commonly known as the "speaker wire", which is inserted into the speaker end of the 6.5 plug (that is, you say usually sing karaoke with a wired microphone with the kind of plug), and the amplifier side is directly connected to the "speaker wire" of the two copper wires, so you do not need to buy online. So you don't need to buy them online, take one of them to an electrical repair store and ask the master to make the same one for you, estimated at 20 to 30 dollars on the line.

And, as I see it, there are no such wires available online, because they are not standardized.