buzzing coming from subs when the car is on?!?!?

I connected two 12" subs to an amp and whenever i turn the car on or turn on my head unit there is a humming/buzzing noise....
what could this be and how could i fix it?
the buzzing seems to get worse when i accelerate.
i have had this exact set up for a long time i just decided to disconnect and reconnect the wires...
it never made this noise to me before
i have had this exact set up for a long time i just decided to disconnect and reconnect the wires...
it never made this noise to me before
 
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