Hey guys, I just got my stereo installed today. I have been using the same speakers for a while prior to getting this stereo. I had it installed today at Best Buy, while I was driving on the freeway I noticed that every time I engage the clutch pedal the speakers would screech? would anyone know the cause of this problem?

 

It could be a faulty ground

 

any particular idea of where the faulty ground is?
I'm scrambling my head trying to figure out why the speakers screech when I engage the clutch pedal. When the pedal is not pressed in, the speakers are perfectly fine. Any ideas anyone?