media feedback buzzing

[the intimidator]

Ihave a 2008.5 mazdaspeed3 factory hd unit,
when use the media i here a buzzing sound even when im not using a ipod or andything when i step on the gas it gets loader to
had a sub in it but dont have it in the car now

can anyone help me

 

[speed3 britz]

I have the same prob with mine and bugs the heck outta me. Idk what it is and its not constant, but often enough

 

[the intimidator]

my radio just started doing this, and i got it replaced before but not for this problem