Here's another good cable proposed by Cordial.
Specially designed for studio applications, according to the brand, it can achieve very good speaker cables.
Being in a period of experimentation, so I made a jack / jack mono CSF275 with this and have tested it in my amp and my external speakers. It makes the job very well.
€ 2 for 4 with Amphenol plugs, for a length of one meter, one obtains a very good cable.
It does not reach the quality of Sommer Tribune 220 but it is an improvement over what is usually provided with a head.
I even tried instrument cable and it works pretty well for a length of 3 meters returning, jack plugs included, 7 €!
Here's a good cable do that necessarily find use in a home studio or a guitarist.