Cable lifters can help separate speaker cables and interconnects from power cords, which can help to reduce or eliminate noise in your system. My previous system had issues when power cords were too close to other cables, so cable lifters helped to keep cables apart and the noise to a minimum.
Other than that, the mere fact of lifting cables off the ground does not lead to audible differences in my experience.
However, this is why I still use them:
1. Cable lifters prevent my robot vacuum cleaner from running over my cables. I use heavy ceramic cable lifters which do not budge when the Roomba bumps into them.
2. RCA caps keep dust and other particles away from my unused jacks, and I feel they also might be helpful in preventing oxidation.
Other than that, the mere fact of lifting cables off the ground does not lead to audible differences in my experience.
However, this is why I still use them:
1. Cable lifters prevent my robot vacuum cleaner from running over my cables. I use heavy ceramic cable lifters which do not budge when the Roomba bumps into them.
2. RCA caps keep dust and other particles away from my unused jacks, and I feel they also might be helpful in preventing oxidation.