Hey guys i own a CPO IS 250 AWD, and recently i noticed when the sub is cranked i hear a clinking sound, i check under the sub in the trunk and directly heard a metal clanking sound. Does anyone know if there is a DIY to safely fix it, as i love the stock sound system but cannot tolerate this clanking sound. thanks alot guys!

 

EXACTLY where is this "clanking" sound coming from? And how loud do you listen to the system?