Considering the many feet of run-of-the-mill OFC copper wire inside of the electronics in a given system, it is surprising that connecting cables could have the profound effect that many report. The main difference between connecting cables and the wire inside of the electronics is susceptibility to EMI and RFI, which can be largely mitigated through geometry and shielding, both of which are inexpensive to implement. Keeping
electronics
close together and close to the power source helps since the LCR parameters increase with length.
If you are an "audiophile" for heaven's sake never look at the hook-up wire inside of your speakers. Manufacturers have been making great sounding gear and speakers for years without using break-the-bank exotic wire.
The amount of time and money spent "evaluating" cables is nothing short of amazing. That so many believe the slightly perceptible differences heard between different cables can actually "transform" the sound of their systems is a glowing testament to the power of the illusory truth effect as well as the genius of the collective marketing teams for well-known cable manufacturers - kudos to them!