humming sound

System was fine. Have 4 components 2 tweeters hooked up to 4 passive cross overs, 2 of the crossovers only had components on them. Just wired the second pair of tweeters to those crossovers. Now when I turn the car on extremely loud buzzing humming noise comes out the the components. I then...

just got a kole audio qx1 3000d that is making a humming sound through my sub with no musical sound at all, not even a bump when i plug in the rca cables and protectoin light is not on either. i took off the back panel for inspection and noticed that unplugging the cooling fan motor stopped...