Downrigger hum sound

When I am fishing with my downrigger I can hear a hum sound coming from the down rigger cable. Is that normal, do the fish mind, and should I switch up to braid?
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http://www.theoutdoorline.com/forum/viewtopic.php?f=7&t=2925
pcorazao wrote:When I am fishing with my downrigger I can hear a hum sound coming from the down rigger cable. Is that normal, do the fish mind, and should I switch up to braid?