Hum from cables? I get plenty of noise just from the wind rushing by my ears. Most earbuds make it a lot worse because they protrude into the airstream. I use sound attenuating Westone UM1 earphones that seal the ear canal. They're nice and quiet, like using foam earplugs. Of course you hear less with them (similar to what you hear in a car with the windows closed) so decide for yourself whether they're appropriate for your use.