Hello Christoph

The cables are pre-set and cannot be replaced with existing cables. Everything is included in the package. There are 2 individual cables per speaker that need to go into the subwoofer (2 in the subwoofer and one in the LS). The cables from the speaker are not interchangeable, so you have no alternative to use an existing cable.
I hope I could answer your question. For higher demands I recommend something more expensive and modern anyway. These speakers are a good intermediate solution, nothing more ;)

LG
Amg