Although cables vary in sound based on manufacturer I think the benefit is basically more about allowing your equipment to perform at its best then adding anything themselves. A four thousand dollar set of speaker cables will do nothing for the cheaper systems but it will make an over the top system shine by allowing you to hear more of the equipment.
I recently added a high end digital cable to my system and it didnt do anything for my DVD player but the same cable put on my transport made a huge difference. The DVD player was already topped out but it allowed the transport to show me more of what it had.
Cables are probably the most marked up product there is in high end audio but I also beleive they are one of the biggest bangs for the buck. Yes you can over do it to the point where it makes no difference but matching the quality and signature sound of cables is as important as matching a dac to a transport.
I recently added a high end digital cable to my system and it didnt do anything for my DVD player but the same cable put on my transport made a huge difference. The DVD player was already topped out but it allowed the transport to show me more of what it had.
Cables are probably the most marked up product there is in high end audio but I also beleive they are one of the biggest bangs for the buck. Yes you can over do it to the point where it makes no difference but matching the quality and signature sound of cables is as important as matching a dac to a transport.