The cables are screwed to the devices using universal clamps. You can therefore cut the loudspeaker cable to your desired length yourself from a 10 metre roll, for example.
See: https://www.digitec.ch/de...

I bought a 10m roll of 2x2.5mm2 diameter speaker cable and cut it to size. No plug is necessary as the cables are clamped directly. At digitec this means: Plug type = "stranded wire" (as the cable is pushed into the stranded wire).
There are several products under the product category "Speaker cables".

The original speaker cables are rubbish. They are clamped at both ends, so you can get thicker ones cut to size, strip the insulation and connect them up.
I reused my old ones and I'm glad I did.