Breaking in cables with FM static

hmm not sure about damage/potential damage(if played at loudly) but i think you can get the break in effect. just by leaving the equipment on running the fm static/white noise with the volume at zero.

don't worry the experts will provide more and likely better info. ah here they come. :0

The white noise from FM occurring between stations with the muting off contains wide spectrum information that could be used as you suggest.

Reproducing this sound through the amp and speakers is not necessary unless they are the intended components for break in. There is no risk to any equipment other than the amp and speaker. Even then requiring uncomfortably high sound pressure levels.

Many break in discs, such as the one manufactured by Purist Audio contains a variety of tones and noises that accomplish the same results in a more efficient manner.

In any case, it's best to mix music sources in addition to the noise to get the best results.

Brian wants to break in speaker cables, so he's gonna have to put up with some noise alright.
Could build yourself some 4 ohm dummy loads with power resistor networks vs. driving the speakers though.