Yes, CATV is up the the RF spectrum so the differences do have much more impact on the signal. Plus the cable stretches are much longer. But even then, the cables are designed with the point of diminishing returns in mind. Main trunk cables are bigger in diameter and more expensive. Distribution cables less so. The drop (from the "terminal" to your house) even less so. A longer cable to your house will have slightly bigger cable than the average as well. But the same parameters do apply in the audio spectrum. But as Mac pointed out, to a lesser extent.

Plus you have to consider the rest of the signal chain.

In the case of my Monster Cable use. The monitor does not have the greatest audio bandwidth so I can hear absolutely no difference between the Planet Waves and the Monster Cable as far as the desired signal is concerned.

The only difference I can hear is this. In those environments where there is a lot of interference sources (light dimmers, etc.) the monitor is quieter with the Monster Cable.

Again, probably due to better shielding.

Your frequency response will only be as good as the weakest link in the chain. For example, if you have a guitar amp with 12" speakers that cut off at 7kHz, there is no reason to get a cable that will pass 20kHz. Even if your speakers cut off at 12kHz, the 20kHz cable is a waste.

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