You can't see the internal wiring so there is no need to use anything special. Most people do not open their speakers. The stuff people use externally is 99% cosmetic, 1% functional. You can get 99% of the best performance possible out of a twisted pair of adequate gauge the shortest length possible. The single most important factor is "the shortest length possible." This is one of the reasons why mono amps behind the speakers is a great upgrade. Important clue. Keeping the speaker wire as short as possible is the idea which would put the amp directly behind the speaker with the rear of the amp facing the rear of the speaker. When you see a nice pair of $140,000 monoblocs on granite bases between the speakers for all to see you can assume this person's ego exceeds his desire for the best possible sound at least on a technical basis.
All my speakers are wired internally and externally with Kimber Kable, IMHO the best speaker cable you can buy. You can buy it in rolls and terminate your cables yourself with the best terminals suited to your system at an extreme savings. You can even cover them with a glittery sheith, install a walnut block over the divisions and tell your friends they cost $10,000. If they are audiophiles they will even believe you.
All my speakers are wired internally and externally with Kimber Kable, IMHO the best speaker cable you can buy. You can buy it in rolls and terminate your cables yourself with the best terminals suited to your system at an extreme savings. You can even cover them with a glittery sheith, install a walnut block over the divisions and tell your friends they cost $10,000. If they are audiophiles they will even believe you.